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用于EagleEye3.0 规则集漏报和误报测试的示例项目，项目收集于github和gitee
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test-example-projects/c++_projects/280w-mysql-8.0.18/sql/table.cc

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/*
Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
#include "sql/table.h"
#include "my_config.h"
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <algorithm>
#include <memory>
#include <string>
#include <unordered_map>
#include <utility>
#include "ft_global.h"
#include "m_string.h"
#include "map_helpers.h"
#include "my_alloc.h"
#include "my_byteorder.h"
#include "my_dbug.h"
#include "my_io.h"
#include "my_loglevel.h"
#include "my_macros.h"
#include "my_pointer_arithmetic.h"
#include "my_psi_config.h"
#include "my_sqlcommand.h"
#include "my_thread_local.h"
#include "myisam.h" // MI_MAX_KEY_LENGTH
#include "mysql/components/services/log_builtins.h"
#include "mysql/components/services/log_shared.h"
#include "mysql/mysql_lex_string.h"
#include "mysql/plugin.h"
#include "mysql/psi/mysql_file.h"
#include "mysql/psi/mysql_mutex.h"
#include "mysql/psi/mysql_table.h"
#include "mysql/psi/psi_base.h"
#include "mysql/psi/psi_table.h"
#include "mysql/service_mysql_alloc.h"
#include "mysql/udf_registration_types.h"
#include "mysql_com.h"
#include "mysql_version.h" // MYSQL_VERSION_ID
#include "mysqld_error.h"
#include "sql/auth/auth_acls.h"
#include "sql/auth/auth_common.h" // acl_getroot
#include "sql/auth/sql_security_ctx.h"
#include "sql/binlog.h" // mysql_bin_log
#include "sql/dd/cache/dictionary_client.h" // dd::cache_Dictionary_client
#include "sql/dd/dd.h" // dd::get_dictionary
#include "sql/dd/dictionary.h" // dd::Dictionary
#include "sql/dd/types/abstract_table.h"
#include "sql/dd/types/table.h" // dd::Table
#include "sql/dd/types/view.h" // dd::View
#include "sql/debug_sync.h" // DEBUG_SYNC
#include "sql/derror.h" // ER_THD
#include "sql/error_handler.h" // Strict_error_handler
#include "sql/field.h"
#include "sql/filesort.h" // filesort_free_buffers
#include "sql/gis/srid.h"
#include "sql/item.h"
#include "sql/item_cmpfunc.h" // and_conds
#include "sql/item_json_func.h" // Item_func_array_cast
#include "sql/json_diff.h" // Json_diff_vector
#include "sql/json_dom.h" // Json_wrapper
#include "sql/json_path.h"
#include "sql/key.h" // find_ref_key
#include "sql/log.h"
#include "sql/my_decimal.h"
#include "sql/mysqld.h" // reg_ext key_file_frm ...
#include "sql/nested_join.h"
#include "sql/opt_trace.h" // opt_trace_disable_if_no_security_...
#include "sql/opt_trace_context.h"
#include "sql/parse_file.h" // sql_parse_prepare
#include "sql/partition_info.h" // partition_info
#include "sql/psi_memory_key.h"
#include "sql/query_options.h"
#include "sql/query_result.h" // Query_result
#include "sql/sql_base.h"
#include "sql/sql_check_constraint.h" // Sql_table_check_constraint
#include "sql/sql_class.h" // THD
#include "sql/sql_error.h"
#include "sql/sql_lex.h"
#include "sql/sql_opt_exec_shared.h"
#include "sql/sql_parse.h" // check_stack_overrun
#include "sql/sql_partition.h" // mysql_unpack_partition
#include "sql/sql_plugin.h" // plugin_unlock
#include "sql/sql_select.h" // actual_key_parts
#include "sql/sql_table.h" // build_table_filename
#include "sql/sql_tablespace.h" // validate_tablespace_name())
#include "sql/strfunc.h" // find_type
#include "sql/system_variables.h"
#include "sql/table_cache.h" // table_cache_manager
#include "sql/table_trigger_dispatcher.h" // Table_trigger_dispatcher
#include "sql/thd_raii.h"
#include "sql/thr_malloc.h"
#include "sql/trigger_def.h"
#include "sql_const.h"
#include "sql_string.h"
#include "template_utils.h" // down_cast
#include "thr_mutex.h"
/* INFORMATION_SCHEMA name */
LEX_CSTRING INFORMATION_SCHEMA_NAME = {STRING_WITH_LEN("information_schema")};
/* PERFORMANCE_SCHEMA name */
LEX_CSTRING PERFORMANCE_SCHEMA_DB_NAME = {
STRING_WITH_LEN("performance_schema")};
/* MYSQL_SCHEMA name */
LEX_CSTRING MYSQL_SCHEMA_NAME = {STRING_WITH_LEN("mysql")};
/* MYSQL_TABLESPACE name */
LEX_CSTRING MYSQL_TABLESPACE_NAME = {STRING_WITH_LEN("mysql")};
/* GENERAL_LOG name */
LEX_CSTRING GENERAL_LOG_NAME = {STRING_WITH_LEN("general_log")};
/* SLOW_LOG name */
LEX_CSTRING SLOW_LOG_NAME = {STRING_WITH_LEN("slow_log")};
/* RLI_INFO name */
LEX_CSTRING RLI_INFO_NAME = {STRING_WITH_LEN("slave_relay_log_info")};
/* MI_INFO name */
LEX_CSTRING MI_INFO_NAME = {STRING_WITH_LEN("slave_master_info")};
/* WORKER_INFO name */
LEX_CSTRING WORKER_INFO_NAME = {STRING_WITH_LEN("slave_worker_info")};
/* GTID_EXECUTED name */
LEX_CSTRING GTID_EXECUTED_NAME = {STRING_WITH_LEN("gtid_executed")};
/* Keyword for parsing generated column functions */
LEX_CSTRING PARSE_GCOL_KEYWORD = {STRING_WITH_LEN("parse_gcol_expr")};
/* Functions defined in this file */
static Item *create_view_field(THD *thd, TABLE_LIST *view, Item **field_ref,
const char *name,
Name_resolution_context *context);
static void open_table_error(THD *thd, TABLE_SHARE *share, int error,
int db_errno);
inline bool is_system_table_name(const char *name, size_t length);
/**************************************************************************
Object_creation_ctx implementation.
**************************************************************************/
Object_creation_ctx *Object_creation_ctx::set_n_backup(THD *thd) {
Object_creation_ctx *backup_ctx;
DBUG_TRACE;
backup_ctx = create_backup_ctx(thd);
change_env(thd);
return backup_ctx;
}
void Object_creation_ctx::restore_env(THD *thd,
Object_creation_ctx *backup_ctx) {
if (!backup_ctx) return;
backup_ctx->change_env(thd);
backup_ctx->delete_backup_ctx();
}
/**************************************************************************
Default_object_creation_ctx implementation.
**************************************************************************/
Default_object_creation_ctx::Default_object_creation_ctx(THD *thd)
: m_client_cs(thd->variables.character_set_client),
m_connection_cl(thd->variables.collation_connection) {}
Default_object_creation_ctx::Default_object_creation_ctx(
const CHARSET_INFO *client_cs, const CHARSET_INFO *connection_cl)
: m_client_cs(client_cs), m_connection_cl(connection_cl) {}
Object_creation_ctx *Default_object_creation_ctx::create_backup_ctx(
THD *thd) const {
return new Default_object_creation_ctx(thd);
}
void Default_object_creation_ctx::delete_backup_ctx() { delete this; }
void Default_object_creation_ctx::change_env(THD *thd) const {
thd->variables.character_set_client = m_client_cs;
thd->variables.collation_connection = m_connection_cl;
thd->update_charset();
}
/**************************************************************************
View_creation_ctx implementation.
**************************************************************************/
View_creation_ctx *View_creation_ctx::create(THD *thd) {
View_creation_ctx *ctx = new (thd->mem_root) View_creation_ctx(thd);
return ctx;
}
/*************************************************************************/
View_creation_ctx *View_creation_ctx::create(THD *thd, TABLE_LIST *view) {
View_creation_ctx *ctx = new (thd->mem_root) View_creation_ctx(thd);
/* Throw a warning if there is NULL cs name. */
if (!view->view_client_cs_name.str || !view->view_connection_cl_name.str) {
push_warning_printf(thd, Sql_condition::SL_NOTE, ER_VIEW_NO_CREATION_CTX,
ER_THD(thd, ER_VIEW_NO_CREATION_CTX), view->db,
view->table_name);
ctx->m_client_cs = system_charset_info;
ctx->m_connection_cl = system_charset_info;
return ctx;
}
/* Resolve cs names. Throw a warning if there is unknown cs name. */
bool invalid_creation_ctx;
invalid_creation_ctx = resolve_charset(
view->view_client_cs_name.str, system_charset_info, &ctx->m_client_cs);
invalid_creation_ctx =
resolve_collation(view->view_connection_cl_name.str, system_charset_info,
&ctx->m_connection_cl) ||
invalid_creation_ctx;
if (invalid_creation_ctx) {
LogErr(WARNING_LEVEL, ER_VIEW_UNKNOWN_CHARSET_OR_COLLATION, view->db,
view->table_name, view->view_client_cs_name.str,
view->view_connection_cl_name.str);
push_warning_printf(
thd, Sql_condition::SL_NOTE, ER_VIEW_INVALID_CREATION_CTX,
ER_THD(thd, ER_VIEW_INVALID_CREATION_CTX), view->db, view->table_name);
}
return ctx;
}
/*************************************************************************/
GRANT_INFO::GRANT_INFO() {
grant_table = 0;
version = 0;
privilege = NO_ACCESS;
}
/**
Returns pointer to '.frm' extension of the file name.
@param name file name
Checks file name part starting with the rightmost '.' character,
and returns it if it is equal to '.frm'.
@todo
It is a good idea to get rid of this function modifying the code
to garantee that the functions presently calling fn_rext() always
get arguments in the same format: either with '.frm' or without '.frm'.
@return
Pointer to the '.frm' extension. If there is no extension,
or extension is not '.frm', pointer at the end of file name.
*/
char *fn_rext(char *name) {
char *res = strrchr(name, '.');
if (res && !strcmp(res, reg_ext)) return res;
return name + strlen(name);
}
TABLE_CATEGORY get_table_category(const LEX_CSTRING &db,
const LEX_CSTRING &name) {
DBUG_ASSERT(db.str != NULL);
DBUG_ASSERT(name.str != NULL);
if (is_infoschema_db(db.str, db.length)) return TABLE_CATEGORY_INFORMATION;
if (is_perfschema_db(db.str, db.length)) return TABLE_CATEGORY_PERFORMANCE;
if ((db.length == MYSQL_SCHEMA_NAME.length) &&
(my_strcasecmp(system_charset_info, MYSQL_SCHEMA_NAME.str, db.str) ==
0)) {
if (is_system_table_name(name.str, name.length))
return TABLE_CATEGORY_SYSTEM;
if ((name.length == GENERAL_LOG_NAME.length) &&
(my_strcasecmp(system_charset_info, GENERAL_LOG_NAME.str, name.str) ==
0))
return TABLE_CATEGORY_LOG;
if ((name.length == SLOW_LOG_NAME.length) &&
(my_strcasecmp(system_charset_info, SLOW_LOG_NAME.str, name.str) == 0))
return TABLE_CATEGORY_LOG;
if ((name.length == RLI_INFO_NAME.length) &&
(my_strcasecmp(system_charset_info, RLI_INFO_NAME.str, name.str) == 0))
return TABLE_CATEGORY_RPL_INFO;
if ((name.length == MI_INFO_NAME.length) &&
(my_strcasecmp(system_charset_info, MI_INFO_NAME.str, name.str) == 0))
return TABLE_CATEGORY_RPL_INFO;
if ((name.length == WORKER_INFO_NAME.length) &&
(my_strcasecmp(system_charset_info, WORKER_INFO_NAME.str, name.str) ==
0))
return TABLE_CATEGORY_RPL_INFO;
if ((name.length == GTID_EXECUTED_NAME.length) &&
(my_strcasecmp(system_charset_info, GTID_EXECUTED_NAME.str, name.str) ==
0))
return TABLE_CATEGORY_GTID;
if (dd::get_dictionary()->is_dd_table_name(MYSQL_SCHEMA_NAME.str, name.str))
return TABLE_CATEGORY_DICTIONARY;
}
return TABLE_CATEGORY_USER;
}
/**
Allocate and setup a TABLE_SHARE structure
@param db schema name.
@param table_name table name.
@param key table cache key (db \0 table_name \0...)
@param key_length length of the key
@param open_secondary true if the TABLE_SHARE represents a table
in a secondary storage engine
@return pointer to allocated table share
@retval NULL error (out of memory, too long path name)
*/
TABLE_SHARE *alloc_table_share(const char *db, const char *table_name,
const char *key, size_t key_length,
bool open_secondary) {
MEM_ROOT mem_root;
TABLE_SHARE *share = NULL;
char *key_buff, *path_buff;
char path[FN_REFLEN + 1];
size_t path_length;
Table_cache_element **cache_element_array;
bool was_truncated = false;
DBUG_TRACE;
DBUG_PRINT("enter", ("table: '%s'.'%s'", db, table_name));
/*
There are FN_REFLEN - reg_ext_length bytes available for the
file path and the trailing '\0', which may be padded to the right
of the length indicated by the length parameter. The returned
path length does not include the trailing '\0'.
*/
path_length = build_table_filename(path, sizeof(path) - 1 - reg_ext_length,
db, table_name, "", 0, &was_truncated);
/*
The path now misses extension, but includes '\0'. Unless it was
truncated, everything should be ok.
*/
if (was_truncated) {
my_error(ER_IDENT_CAUSES_TOO_LONG_PATH, MYF(0), sizeof(path) - 1, path);
return NULL;
}
init_sql_alloc(key_memory_table_share, &mem_root, TABLE_ALLOC_BLOCK_SIZE, 0);
if (multi_alloc_root(&mem_root, &share, sizeof(*share), &key_buff, key_length,
&path_buff, path_length + 1, &cache_element_array,
table_cache_instances * sizeof(*cache_element_array),
NULL)) {
new (share) TABLE_SHARE(refresh_version, open_secondary);
share->set_table_cache_key(key_buff, key, key_length);
share->path.str = path_buff;
share->path.length = path_length;
my_stpcpy(share->path.str, path);
share->normalized_path.str = share->path.str;
share->normalized_path.length = path_length;
/*
Since alloc_table_share() can be called without any locking (for
example, ha_create_table... functions), we do not assign a table
map id here. Instead we assign a value that is not used
elsewhere, and then assign a table map id inside open_table()
under the protection of the LOCK_open mutex.
*/
share->table_map_id = ~0ULL;
share->cached_row_logging_check = -1;
share->m_flush_tickets.empty();
memset(cache_element_array, 0,
table_cache_instances * sizeof(*cache_element_array));
share->cache_element = cache_element_array;
share->mem_root = std::move(mem_root);
mysql_mutex_init(key_TABLE_SHARE_LOCK_ha_data, &share->LOCK_ha_data,
MY_MUTEX_INIT_FAST);
}
return share;
}
/**
Initialize share for temporary tables
@param thd thread handle
@param share Share to fill
@param key Table_cache_key, as generated from create_table_def_key.
must start with db name.
@param key_length Length of key
@param table_name Table name
@param path Path to file (possible in lower case) without .frm
@param mem_root MEM_ROOT to transfer (move) to the TABLE_SHARE; if
NULL a new one is initialized.
@note
This is different from alloc_table_share() because temporary tables
don't have to be shared between threads or put into the table def
cache, so we can do some things notable simpler and faster
If table is not put in thd->temporary_tables (happens only when
one uses OPEN TEMPORARY) then one can specify 'db' as key and
use key_length= 0 as neither table_cache_key or key_length will be used).
*/
void init_tmp_table_share(THD *thd, TABLE_SHARE *share, const char *key,
size_t key_length, const char *table_name,
const char *path, MEM_ROOT *mem_root) {
DBUG_TRACE;
DBUG_PRINT("enter", ("table: '%s'.'%s'", key, table_name));
new (share) TABLE_SHARE();
if (mem_root)
share->mem_root = std::move(*mem_root);
else
init_sql_alloc(key_memory_table_share, &share->mem_root,
TABLE_ALLOC_BLOCK_SIZE, 0);
share->table_category = TABLE_CATEGORY_TEMPORARY;
share->tmp_table = INTERNAL_TMP_TABLE;
share->db.str = key;
share->db.length = strlen(key);
share->table_cache_key.str = key;
share->table_cache_key.length = key_length;
share->table_name.str = table_name;
share->table_name.length = strlen(table_name);
share->path.str = const_cast<char *>(path);
share->normalized_path.str = path;
share->path.length = share->normalized_path.length = strlen(path);
share->cached_row_logging_check = -1;
/*
table_map_id is also used for MERGE tables to suppress repeated
compatibility checks.
*/
share->table_map_id = (ulonglong)thd->query_id;
share->m_flush_tickets.empty();
}
Key_map TABLE_SHARE::usable_indexes(const THD *thd) const {
Key_map usable_indexes(keys_in_use);
if (!thd->optimizer_switch_flag(OPTIMIZER_SWITCH_USE_INVISIBLE_INDEXES))
usable_indexes.intersect(visible_indexes);
return usable_indexes;
}
#ifndef DBUG_OFF
/**
Assert that the #LOCK_open mutex is held when the reference count of
a TABLE_SHARE is accessed.
@param share the TABLE_SHARE
@return true if the assertion holds, terminates the process otherwise
*/
bool assert_ref_count_is_locked(const TABLE_SHARE *share) {
// The mutex is not needed while the TABLE_SHARE is being
// constructed, or if it is for a temporary table.
if (share->table_category != TABLE_UNKNOWN_CATEGORY &&
share->tmp_table == NO_TMP_TABLE) {
mysql_mutex_assert_owner(&LOCK_open);
}
return true;
}
#endif
void TABLE_SHARE::clear_version() {
table_cache_manager.assert_owner_all_and_tdc();
m_version = 0;
}
/**
Release resources (plugins) used by the share and free its memory.
TABLE_SHARE is self-contained -- it's stored in its own MEM_ROOT.
Free this MEM_ROOT.
*/
void TABLE_SHARE::destroy() {
uint idx;
KEY *info_it;
DBUG_TRACE;
DBUG_PRINT("info", ("db: %s table: %s", db.str, table_name.str));
if (ha_share) {
delete ha_share;
ha_share = NULL;
}
if (m_part_info) {
::destroy(m_part_info);
m_part_info = NULL;
}
/* The mutex is initialized only for shares that are part of the TDC */
if (tmp_table == NO_TMP_TABLE) mysql_mutex_destroy(&LOCK_ha_data);
delete name_hash;
name_hash = nullptr;
delete m_histograms;
m_histograms = nullptr;
plugin_unlock(NULL, db_plugin);
db_plugin = NULL;
/* Release fulltext parsers */
info_it = key_info;
for (idx = keys; idx; idx--, info_it++) {
if (info_it->flags & HA_USES_PARSER) {
plugin_unlock(NULL, info_it->parser);
info_it->flags = 0;
}
}
/* Destroy dd::Table object associated with temporary table's share. */
delete tmp_table_def;
tmp_table_def = NULL;
/* Delete the view object. */
delete view_object;
view_object = NULL;
#ifdef HAVE_PSI_TABLE_INTERFACE
PSI_TABLE_CALL(release_table_share)(m_psi);
#endif
/*
Make a copy since the share is allocated in its own root,
and free_root() updates its argument after freeing the memory.
*/
MEM_ROOT own_root = std::move(mem_root);
free_root(&own_root, MYF(0));
}
/**
Free table share and memory used by it
@param share Table share
*/
void free_table_share(TABLE_SHARE *share) {
DBUG_TRACE;
DBUG_PRINT("enter", ("table: %s.%s", share->db.str, share->table_name.str));
DBUG_ASSERT(share->ref_count() == 0);
if (share->m_flush_tickets.is_empty()) {
/*
No threads are waiting for this share to be flushed (the
share is not old, is for a temporary table, or just nobody
happens to be waiting for it). Destroy it.
*/
share->destroy();
} else {
Wait_for_flush_list::Iterator it(share->m_flush_tickets);
Wait_for_flush *ticket;
/*
We're about to iterate over a list that is used
concurrently. Make sure this never happens without a lock.
*/
mysql_mutex_assert_owner(&LOCK_open);
while ((ticket = it++))
(void)ticket->get_ctx()->m_wait.set_status(MDL_wait::GRANTED);
/*
If there are threads waiting for this share to be flushed,
the last one to receive the notification will destroy the
share. At this point the share is removed from the table
definition cache, so is OK to proceed here without waiting
for this thread to do the work.
*/
}
}
/**
Return true if a table name matches one of the system table names.
Currently these are:
help_category, help_keyword, help_relation, help_topic,
proc, event
time_zone, time_zone_leap_second, time_zone_name, time_zone_transition,
time_zone_transition_type
This function trades accuracy for speed, so may return false
positives. Presumably mysql.* database is for internal purposes only
and should not contain user tables.
*/
inline bool is_system_table_name(const char *name, size_t length) {
CHARSET_INFO *ci = system_charset_info;
return (
/* mysql.proc table */
(length == 4 && my_tolower(ci, name[0]) == 'p' &&
my_tolower(ci, name[1]) == 'r' && my_tolower(ci, name[2]) == 'o' &&
my_tolower(ci, name[3]) == 'c') ||
(length > 4 &&
(
/* one of mysql.help* tables */
(my_tolower(ci, name[0]) == 'h' && my_tolower(ci, name[1]) == 'e' &&
my_tolower(ci, name[2]) == 'l' && my_tolower(ci, name[3]) == 'p') ||
/* one of mysql.time_zone* tables */
(my_tolower(ci, name[0]) == 't' && my_tolower(ci, name[1]) == 'i' &&
my_tolower(ci, name[2]) == 'm' && my_tolower(ci, name[3]) == 'e') ||
/* mysql.event table */
(my_tolower(ci, name[0]) == 'e' && my_tolower(ci, name[1]) == 'v' &&
my_tolower(ci, name[2]) == 'e' && my_tolower(ci, name[3]) == 'n' &&
my_tolower(ci, name[4]) == 't'))));
}
/**
Initialize key_part_flag from source field.
*/
void KEY_PART_INFO::init_flags() {
DBUG_ASSERT(field);
if (field->type() == MYSQL_TYPE_BLOB || field->type() == MYSQL_TYPE_GEOMETRY)
key_part_flag |= HA_BLOB_PART;
else if (field->real_type() == MYSQL_TYPE_VARCHAR)
key_part_flag |= HA_VAR_LENGTH_PART;
else if (field->type() == MYSQL_TYPE_BIT)
key_part_flag |= HA_BIT_PART;
}
/**
Initialize KEY_PART_INFO from the given field.
@param fld The field to initialize keypart from
*/
void KEY_PART_INFO::init_from_field(Field *fld) {
field = fld;
fieldnr = field->field_index + 1;
null_bit = field->null_bit;
null_offset = field->null_offset();
offset = field->offset(field->table->record[0]);
length = (uint16)field->key_length();
store_length = length;
key_part_flag = 0;
if (field->real_maybe_null()) store_length += HA_KEY_NULL_LENGTH;
if (field->type() == MYSQL_TYPE_BLOB ||
field->real_type() == MYSQL_TYPE_VARCHAR ||
field->type() == MYSQL_TYPE_GEOMETRY) {
store_length += HA_KEY_BLOB_LENGTH;
}
init_flags();
ha_base_keytype key_type = field->key_type();
type = (uint8)key_type;
bin_cmp = key_type != HA_KEYTYPE_TEXT && key_type != HA_KEYTYPE_VARTEXT1 &&
key_type != HA_KEYTYPE_VARTEXT2;
}
/**
Setup key-related fields of Field object for given key and key part.
@param[in] share Pointer to TABLE_SHARE
@param[in] handler_file Pointer to handler
@param[in] primary_key_n Primary key number
@param[in] keyinfo Pointer to processed key
@param[in] key_n Processed key number
@param[in] key_part_n Processed key part number
@param[in,out] usable_parts Pointer to usable_parts variable
@param[in] part_of_key_not_extended Set when column is part of the Key
and not appended by the storage
engine from primary key columns.
*/
void setup_key_part_field(TABLE_SHARE *share, handler *handler_file,
uint primary_key_n, KEY *keyinfo, uint key_n,
uint key_part_n, uint *usable_parts,
bool part_of_key_not_extended) {
KEY_PART_INFO *key_part = &keyinfo->key_part[key_part_n];
Field *field = key_part->field;
/* Flag field as unique if it is the only keypart in a unique index */
if (key_part_n == 0 && key_n != primary_key_n)
field->flags |= (((keyinfo->flags & HA_NOSAME) &&
(keyinfo->user_defined_key_parts == 1))
? UNIQUE_KEY_FLAG
: MULTIPLE_KEY_FLAG);
if (key_part_n == 0) field->key_start.set_bit(key_n);
field->m_indexed = true;
const bool full_length_key_part =
(field->key_length() == key_part->length && !(field->flags & BLOB_FLAG));
/*
part_of_key contains all non-prefix keys, part_of_prefixkey
contains prefix keys.
Note that prefix keys in the extended PK key parts
(part_of_key_not_extended is false) are not considered.
*/
if (full_length_key_part) {
field->part_of_key.set_bit(key_n);
if (part_of_key_not_extended)
field->part_of_key_not_extended.set_bit(key_n);
} else if (part_of_key_not_extended) {
field->part_of_prefixkey.set_bit(key_n);
}
if ((handler_file->index_flags(key_n, key_part_n, 0) & HA_KEYREAD_ONLY) &&
field->type() != MYSQL_TYPE_GEOMETRY) {
// Set the key as 'keys_for_keyread' even if it is prefix key.
share->keys_for_keyread.set_bit(key_n);
}
if (full_length_key_part &&
(handler_file->index_flags(key_n, key_part_n, 1) & HA_READ_ORDER))
field->part_of_sortkey.set_bit(key_n);
if (!(key_part->key_part_flag & HA_REVERSE_SORT) &&
*usable_parts == key_part_n)
(*usable_parts)++; // For FILESORT
}
/**
Generate extended secondary keys by adding primary key parts to the
existing secondary key. A primary key part is added if such part doesn't
present in the secondary key or the part in the secondary key is a
prefix of the key field. Key parts are added till:
.) all parts were added
.) number of key parts became bigger that MAX_REF_PARTS
.) total key length became longer than MAX_REF_LENGTH
depending on what occurs first first.
Unlike existing secondary key parts which are initialized at
open_binary_frm(), newly added ones are initialized here by copying
KEY_PART_INFO structure from primary key part and calling
setup_key_part_field().
Function updates sk->actual/unused_key_parts and sk->actual_flags.
@param[in] sk Secondary key
@param[in] sk_n Secondary key number
@param[in] pk Primary key
@param[in] pk_n Primary key number
@param[in] share Pointer to TABLE_SHARE
@param[in] handler_file Pointer to handler
@param[in,out] usable_parts Pointer to usable_parts variable
@retval Number of added key parts
*/
uint add_pk_parts_to_sk(KEY *sk, uint sk_n, KEY *pk, uint pk_n,
TABLE_SHARE *share, handler *handler_file,
uint *usable_parts) {
uint max_key_length = sk->key_length;
bool is_unique_key = false;
KEY_PART_INFO *current_key_part = &sk->key_part[sk->user_defined_key_parts];
/*
For each keypart in the primary key: check if the keypart is
already part of the secondary key and add it if not.
*/
for (uint pk_part = 0; pk_part < pk->user_defined_key_parts; pk_part++) {
KEY_PART_INFO *pk_key_part = &pk->key_part[pk_part];
/* MySQL does not supports more key parts than MAX_REF_LENGTH */
if (sk->actual_key_parts >= MAX_REF_PARTS) goto end;
bool pk_field_is_in_sk = false;
for (uint j = 0; j < sk->user_defined_key_parts; j++) {
if (sk->key_part[j].fieldnr == pk_key_part->fieldnr &&
share->field[pk_key_part->fieldnr - 1]->key_length() ==
sk->key_part[j].length) {
pk_field_is_in_sk = true;
break;
}
}
/* Add PK field to secondary key if it's not already part of the key. */
if (!pk_field_is_in_sk) {
/* MySQL does not supports keys longer than MAX_KEY_LENGTH */
if (max_key_length + pk_key_part->length > MAX_KEY_LENGTH) goto end;
*current_key_part = *pk_key_part;
setup_key_part_field(share, handler_file, pk_n, sk, sk_n,
sk->actual_key_parts, usable_parts, false);
sk->actual_key_parts++;
sk->unused_key_parts--;
sk->rec_per_key[sk->actual_key_parts - 1] = 0;
sk->set_records_per_key(sk->actual_key_parts - 1, REC_PER_KEY_UNKNOWN);
current_key_part++;
max_key_length += pk_key_part->length;
/*
Secondary key will be unique if the key does not exceed
key length limitation and key parts limitation.
*/
is_unique_key = true;
}
}
if (is_unique_key) sk->actual_flags |= HA_NOSAME;
end:
return (sk->actual_key_parts - sk->user_defined_key_parts);
}
//////////////////////////////////////////////////////////////////////////
/*
The following section adds code for the interface with the .frm file.
These defines and functions comes from the file sql/field.h in 5.7
Note:
These functions should not be used any where else in the code.
They are only used in upgrade scenario for migrating old data directory
to be compatible with current server. They will be removed in future
release.
Any new code should not be added in this section.
*/
#define FIELDFLAG_DECIMAL 1
#define FIELDFLAG_BINARY 1 // Shares same flag
#define FIELDFLAG_NUMBER 2
#define FIELDFLAG_ZEROFILL 4
#define FIELDFLAG_PACK 120 // Bits used for packing
#define FIELDFLAG_INTERVAL 256 // mangled with decimals!
#define FIELDFLAG_BITFIELD 512 // mangled with decimals!
#define FIELDFLAG_BLOB 1024 // mangled with decimals!
#define FIELDFLAG_GEOM 2048 // mangled with decimals!
#define FIELDFLAG_JSON \
4096 /* mangled with decimals and \
with bitfields! */
#define FIELDFLAG_TREAT_BIT_AS_CHAR 4096 /* use Field_bit_as_char */
#define FIELDFLAG_LEFT_FULLSCREEN 8192
#define FIELDFLAG_RIGHT_FULLSCREEN 16384
#define FIELDFLAG_FORMAT_NUMBER 16384 // predit: ###,,## in output
#define FIELDFLAG_NO_DEFAULT 16384 /* sql */
#define FIELDFLAG_SUM ((uint)32768) // predit: +#fieldflag
#define FIELDFLAG_MAYBE_NULL ((uint)32768) // sql
#define FIELDFLAG_PACK_SHIFT 3
#define FIELDFLAG_DEC_SHIFT 8
#define FIELDFLAG_MAX_DEC 31
#define FIELDFLAG_NUM_SCREEN_TYPE 0x7F01
#define FIELDFLAG_ALFA_SCREEN_TYPE 0x7800
#define MTYP_TYPENR(type) (type & 127) /* Remove bits from type */
#define FIELD_NR_MASK 16383 /* To get fieldnumber */
inline int f_is_dec(int x) { return (x & FIELDFLAG_DECIMAL); }
inline int f_is_num(int x) { return (x & FIELDFLAG_NUMBER); }
inline int f_is_zerofill(int x) { return (x & FIELDFLAG_ZEROFILL); }
inline int f_is_packed(int x) { return (x & FIELDFLAG_PACK); }
inline int f_packtype(int x) { return ((x >> FIELDFLAG_PACK_SHIFT) & 15); }
inline uint8 f_decimals(int x) {
return ((uint8)((x >> FIELDFLAG_DEC_SHIFT) & FIELDFLAG_MAX_DEC));
}
inline int f_is_alpha(int x) { return (!f_is_num(x)); }
inline int f_is_binary(int x) {
return (x & FIELDFLAG_BINARY); // 4.0- compatibility
}
inline int f_is_enum(int x) {
return ((x & (FIELDFLAG_INTERVAL | FIELDFLAG_NUMBER)) == FIELDFLAG_INTERVAL);
}
inline int f_is_bitfield(int x) {
return ((x & (FIELDFLAG_BITFIELD | FIELDFLAG_NUMBER)) == FIELDFLAG_BITFIELD);
}
inline int f_is_blob(int x) {
return ((x & (FIELDFLAG_BLOB | FIELDFLAG_NUMBER)) == FIELDFLAG_BLOB);
}
inline int f_is_geom(int x) {
return ((x & (FIELDFLAG_GEOM | FIELDFLAG_NUMBER)) == FIELDFLAG_GEOM);
}
inline int f_is_json(int x) {
return ((x & (FIELDFLAG_JSON | FIELDFLAG_NUMBER | FIELDFLAG_BITFIELD)) ==
FIELDFLAG_JSON);
}
inline int f_is_equ(int x) { return (x & (1 + 2 + FIELDFLAG_PACK + 31 * 256)); }
inline int f_settype(int x) { return (x << FIELDFLAG_PACK_SHIFT); }
inline int f_maybe_null(int x) { return (x & FIELDFLAG_MAYBE_NULL); }
inline int f_no_default(int x) { return (x & FIELDFLAG_NO_DEFAULT); }
inline int f_bit_as_char(int x) { return (x & FIELDFLAG_TREAT_BIT_AS_CHAR); }
/**
Read string from a file with malloc
@note We add an \0 at end of the read string to make reading of C strings
easier. This function is added to read .frm file in upgrade scenario. It
should not be used any where else in the code. This function will be removed
later.
@param[in] file file handler
@param[out] to pointer to read string
@param[in] length length of string
@retval 0 Error
@retval 1 Success
*/
static int read_string(File file, uchar **to, size_t length) {
DBUG_TRACE;
my_free(*to);
if (!(*to = (uchar *)my_malloc(PSI_NOT_INSTRUMENTED, length + 1,
MYF(MY_WME))) ||
mysql_file_read(file, *to, length, MYF(MY_NABP))) {
my_free(*to); /* purecov: inspected */
*to = 0; /* purecov: inspected */
return 1; /* purecov: inspected */
}
*((char *)*to + length) = '\0';
return 0;
} /* read_string */
/**
Un-hex all elements in a typelib.
@param[in] interval TYPELIB (struct of pointer to values + lengths + count)
@note This function is added to read .frm file in upgrade scenario. It should
not be used any where else in the code. This function will be removed later.
*/
static void unhex_type2(TYPELIB *interval) {
for (uint pos = 0; pos < interval->count; pos++) {
char *from, *to;
for (from = to = const_cast<char *>(interval->type_names[pos]); *from;) {
/*
Note, hexchar_to_int(*from++) doesn't work
one some compilers, e.g. IRIX. Looks like a compiler
bug in inline functions in combination with arguments
that have a side effect. So, let's use from[0] and from[1]
and increment 'from' by two later.
*/
*to++ = (char)(hexchar_to_int(from[0]) << 4) + hexchar_to_int(from[1]);
from += 2;
}
interval->type_lengths[pos] /= 2;
}
}
/**
Search after a field with given start & length
If an exact field isn't found, return longest field with starts
at right position.
@note This is needed because in some .frm fields 'fieldnr' was saved wrong.
This function is added to read .frm file in upgrade scenario. It should not
be used any where else in the code. This function will be removed later.
@retval 0 error
@retval field number +1 success
*/
static uint find_field(Field **fields, uchar *record, uint start, uint length) {
Field **field;
uint i, pos;
pos = 0;
for (field = fields, i = 1; *field; i++, field++) {
if ((*field)->offset(record) == start) {
if ((*field)->key_length() == length) return (i);
if (!pos || fields[pos - 1]->pack_length() < (*field)->pack_length())
pos = i;
}
}
return (pos);
}
/**
fix a str_type to a array type
typeparts separated with some char. differents types are separated
with a '\0'
@note This function is added to read .frm file in upgrade scenario. It
should not be used any where else in the code. This function will be
removed later.
@param[out] array Pointer to interval array
@param[in] point_to_type Pointer to intervals
@param[in] types number of intervals
@param[out] names name of intervals
*/
static void fix_type_pointers(const char ***array, TYPELIB *point_to_type,
uint types, char **names) {
char *type_name, *ptr;
char chr;
ptr = *names;
while (types--) {
point_to_type->name = 0;
point_to_type->type_names = *array;
if ((chr = *ptr)) /* Test if empty type */
{
while ((type_name = strchr(ptr + 1, chr)) != NullS) {
*((*array)++) = ptr + 1;
*type_name = '\0'; /* End string */
ptr = type_name;
}
ptr += 2; /* Skip end mark and last 0 */
} else
ptr++;
point_to_type->count = (uint)(*array - point_to_type->type_names);
point_to_type++;
*((*array)++) = NullS; /* End of type */
}
*names = ptr; /* Update end */
return;
} /* fix_type_pointers */
/**
Find where a form starts.
@note This function is added to read .frm file in upgrade scenario. It should
not be used any where else in the code. This function will be removed later.
@param[in] file File handler
@param[in] head The start of the form file.
@remark If formname is NULL then only formnames is read.
@retval The form position.
*/
static ulong get_form_pos(File file, uchar *head) {
uchar *pos, *buf;
uint names, length;
ulong ret_value = 0;
DBUG_TRACE;
names = uint2korr(head + 8);
if (!(names = uint2korr(head + 8))) return 0;
length = uint2korr(head + 4);
mysql_file_seek(file, 64L, MY_SEEK_SET, MYF(0));
if (!(buf = (uchar *)my_malloc(PSI_NOT_INSTRUMENTED, length + names * 4,
MYF(MY_WME))))
return 0;
if (mysql_file_read(file, buf, length + names * 4, MYF(MY_NABP))) {
my_free(buf);
return 0;
}
pos = buf + length;
ret_value = uint4korr(pos);
my_free(buf);
return ret_value;
}
#define STORAGE_TYPE_MASK 7
#define COLUMN_FORMAT_MASK 7
#define COLUMN_FORMAT_SHIFT 3
/**
Auxiliary function which creates Field object from in-memory
representation of .FRM file.
NOTES:
This function is added to read .frm file in upgrade scenario. It should not
be used any where else in the code. This function will be removed later.
@param thd Connection context.
@param share TABLE_SHARE for which Field object
needs to be constructed.
@param frm_context FRM_context for the structures removed
from TABLE_SHARE.
@param new_frm_ver .FRM file version.
@param use_hash Indicates whether we use hash or linear
search to lookup fields by name.
@param field_idx Field index in TABLE_SHARE::field array.
@param strpos Pointer to part of .FRM's screens
section describing the field to be
created.
@param format_section_fields Array where each byte contains packed
values of COLUMN_FORMAT/STORAGE options
for corresponding column.
@param[in,out] comment_pos Pointer to part of column comments
section of .FRM which corresponds
to current field. Advanced to the
position corresponding to comment
for the next column.
@param[in,out] gcol_screen_pos Pointer to part of generated columns
section of .FRM which corresponds
to current generated field. If field
to be created is generated advanced
to the position for the next column
@param[in,out] null_pos Current byte in the record preamble
to be used for field's null/leftover
bits if necessary.
@param[in,out] null_bit_pos Current bit in the current preamble
byte to be used for field's null/
leftover bits if necessary.
@param[out] errarg Additional argument for the error to
be reported.
@retval 0 Success.
@retval non-0 Error number (@sa open_table_def() for details).
*/
static int make_field_from_frm(THD *thd, TABLE_SHARE *share,
FRM_context *frm_context, uint new_frm_ver,
bool use_hash, uint field_idx, uchar *strpos,
uchar *format_section_fields, char **comment_pos,
char **gcol_screen_pos, uchar **null_pos,
uint *null_bit_pos, int *errarg) {
uint pack_flag, interval_nr, unireg_type, recpos, field_length;
uint gcol_info_length = 0;
enum_field_types field_type;
const CHARSET_INFO *charset = NULL;
Field::geometry_type geom_type = Field::GEOM_GEOMETRY;
LEX_CSTRING comment;
Value_generator *gcol_info = nullptr;
bool fld_stored_in_db = true;
Field *reg_field;
if (new_frm_ver >= 3) {
/* new frm file in 4.1 */
field_length = uint2korr(strpos + 3);
recpos = uint3korr(strpos + 5);
pack_flag = uint2korr(strpos + 8);
unireg_type = (uint)strpos[10];
interval_nr = (uint)strpos[12];
uint comment_length = uint2korr(strpos + 15);
field_type = (enum_field_types)(uint)strpos[13];
/* charset and geometry_type share the same byte in frm */
if (field_type == MYSQL_TYPE_GEOMETRY) {
geom_type = (Field::geometry_type)strpos[14];
charset = &my_charset_bin;
} else {
uint csid = strpos[14] + (((uint)strpos[11]) << 8);
if (!csid)
charset = &my_charset_bin;
else if (!(charset = get_charset(csid, MYF(0)))) {
// Unknown or unavailable charset
*errarg = (int)csid;
return 5;
}
}
if (!comment_length) {
comment.str = "";
comment.length = 0;
} else {
comment.str = *comment_pos;
comment.length = comment_length;
(*comment_pos) += comment_length;
}
if (unireg_type & FRM_context::GENERATED_FIELD) {
/*
Get generated column data stored in the .frm file as follows:
byte 1 = 1 (always 1 to allow for future extensions)
byte 2,3 = expression length
byte 4 = flags, as of now:
0 - no flags
1 - field is physically stored
byte 5-... = generated column expression (text data)
*/
gcol_info = new (thd->mem_root) Value_generator();
if ((uint)(*gcol_screen_pos)[0] != 1) return 4;
gcol_info_length = uint2korr(*gcol_screen_pos + 1);
DBUG_ASSERT(gcol_info_length); // Expect non-null expression
fld_stored_in_db = (bool)(uint)(*gcol_screen_pos)[3];
gcol_info->set_field_stored(fld_stored_in_db);
gcol_info->dup_expr_str(&share->mem_root,
*gcol_screen_pos + (uint)FRM_GCOL_HEADER_SIZE,
gcol_info_length);
(*gcol_screen_pos) += gcol_info_length + FRM_GCOL_HEADER_SIZE;
share->vfields++;
}
} else {
field_length = (uint)strpos[3];
recpos = uint2korr(strpos + 4), pack_flag = uint2korr(strpos + 6);
pack_flag &= ~FIELDFLAG_NO_DEFAULT; // Safety for old files
unireg_type = (uint)strpos[8];
interval_nr = (uint)strpos[10];
/* old frm file */
field_type = (enum_field_types)f_packtype(pack_flag);
if (f_is_binary(pack_flag)) {
/*
Try to choose the best 4.1 type:
- for 4.0 "CHAR(N) BINARY" or "VARCHAR(N) BINARY"
try to find a binary collation for character set.
- for other types (e.g. BLOB) just use my_charset_bin.
*/
if (!f_is_blob(pack_flag)) {
// 3.23 or 4.0 string
if (!(charset = get_charset_by_csname(share->table_charset->csname,
MY_CS_BINSORT, MYF(0))))
charset = &my_charset_bin;
} else
charset = &my_charset_bin;
} else
charset = share->table_charset;
memset(&comment, 0, sizeof(comment));
}
if (interval_nr && charset->mbminlen > 1) {
/* Unescape UCS2 intervals from HEX notation */
TYPELIB *interval = share->intervals + interval_nr - 1;
unhex_type2(interval);
}
if (field_type == MYSQL_TYPE_NEWDECIMAL && !share->mysql_version) {
/*
Fix pack length of old decimal values from 5.0.3 -> 5.0.4
The difference is that in the old version we stored precision
in the .frm table while we now store the display_length
*/
uint decimals = f_decimals(pack_flag);
field_length = my_decimal_precision_to_length(field_length, decimals,
f_is_dec(pack_flag) == 0);
LogErr(ERROR_LEVEL, ER_TABLE_INCOMPATIBLE_DECIMAL_FIELD,
frm_context->fieldnames.type_names[field_idx], share->table_name.str,
share->table_name.str);
push_warning_printf(thd, Sql_condition::SL_WARNING, ER_CRASHED_ON_USAGE,
ER_THD(thd, ER_TABLE_INCOMPATIBLE_DECIMAL_FIELD),
frm_context->fieldnames.type_names[field_idx],
share->table_name.str, share->table_name.str);
share->crashed = 1; // Marker for CHECK TABLE
}
if (field_type == MYSQL_TYPE_YEAR && field_length != 4) {
LogErr(ERROR_LEVEL, ER_TABLE_INCOMPATIBLE_YEAR_FIELD,
frm_context->fieldnames.type_names[field_idx], share->table_name.str,
share->table_name.str);
push_warning_printf(thd, Sql_condition::SL_WARNING, ER_CRASHED_ON_USAGE,
ER_THD(thd, ER_TABLE_INCOMPATIBLE_YEAR_FIELD),
frm_context->fieldnames.type_names[field_idx],
share->table_name.str, share->table_name.str);
share->crashed = 1;
}
FRM_context::utype unireg = (FRM_context::utype)MTYP_TYPENR(unireg_type);
// Construct auto_flag
uchar auto_flags = Field::NONE;
if (unireg == FRM_context::TIMESTAMP_DN_FIELD ||
unireg == FRM_context::TIMESTAMP_DNUN_FIELD)
auto_flags |= Field::DEFAULT_NOW;
if (unireg == FRM_context::TIMESTAMP_UN_FIELD ||
unireg == FRM_context::TIMESTAMP_DNUN_FIELD)
auto_flags |= Field::ON_UPDATE_NOW;
if (unireg == FRM_context::NEXT_NUMBER) auto_flags |= Field::NEXT_NUMBER;
share->field[field_idx] = reg_field = make_field(
thd->mem_root, share,
share->default_values - 1 + recpos, // recpos starts from 1.
(uint32)field_length, *null_pos, *null_bit_pos, field_type, charset,
geom_type, auto_flags,
(interval_nr ? share->intervals + interval_nr - 1 : (TYPELIB *)0),
frm_context->fieldnames.type_names[field_idx], f_maybe_null(pack_flag),
f_is_zerofill(pack_flag) != 0, f_is_dec(pack_flag) == 0,
f_decimals(pack_flag), f_bit_as_char(pack_flag), 0, {},
// Array fields aren't supported in .frm-based tables
false);
if (!reg_field) {
// Not supported field type
return 4;
}
reg_field->field_index = field_idx;
reg_field->comment = comment;
reg_field->gcol_info = gcol_info;
reg_field->stored_in_db = fld_stored_in_db;
if (field_type == MYSQL_TYPE_BIT && !f_bit_as_char(pack_flag)) {
if (((*null_bit_pos) += field_length & 7) > 7) {
(*null_pos)++;
(*null_bit_pos) -= 8;
}
}
if (!(reg_field->flags & NOT_NULL_FLAG)) {
if (!(*null_bit_pos = (*null_bit_pos + 1) & 7)) (*null_pos)++;
}
if (f_no_default(pack_flag)) reg_field->flags |= NO_DEFAULT_VALUE_FLAG;
if (unireg == FRM_context::NEXT_NUMBER)
share->found_next_number_field = share->field + field_idx;
if (use_hash) {
Field **field = share->field + field_idx;
share->name_hash->emplace((*field)->field_name, field);
}
if (format_section_fields) {
const uchar field_flags = format_section_fields[field_idx];
const uchar field_storage = (field_flags & STORAGE_TYPE_MASK);
const uchar field_column_format =
((field_flags >> COLUMN_FORMAT_SHIFT) & COLUMN_FORMAT_MASK);
DBUG_PRINT("debug", ("field flags: %u, storage: %u, column_format: %u",
field_flags, field_storage, field_column_format));
reg_field->set_storage_type((ha_storage_media)field_storage);
reg_field->set_column_format((column_format_type)field_column_format);
}
if (!reg_field->stored_in_db) {
frm_context->stored_fields--;
if (share->stored_rec_length >= recpos)
share->stored_rec_length = recpos - 1;
}
return 0;
}
static const longlong FRM_VER = 6;
static const longlong FRM_VER_TRUE_VARCHAR = (FRM_VER + 4); /* 10 */
/**
Read data from a binary .frm file from MySQL 3.23 - 5.0 into TABLE_SHARE
@note Much of the logic here is duplicated in create_tmp_table()
(see sql_select.cc). Hence, changes to this function may have to be
repeated there.
This function is added to read .frm file in upgrade scenario. It should not
be used any where else in the code. This function will be removed later.
@param thd thread handle
@param share TABLE_SHARE to be populated.
@param frm_context structures removed from TABLE_SHARE
@param head frm file header
@param file File handle
*/
static int open_binary_frm(THD *thd, TABLE_SHARE *share,
FRM_context *frm_context, uchar *head, File file) {
int error, errarg = 0;
uint new_frm_ver, field_pack_length, new_field_pack_flag;
uint interval_count, interval_parts, read_length, int_length;
uint db_create_options, keys, key_parts, n_length;
uint key_info_length, com_length, null_bit_pos, gcol_screen_length;
uint extra_rec_buf_length;
uint i, j;
bool use_extended_sk; // Supported extending of secondary keys with PK parts
bool use_hash;
char *keynames, *names, *comment_pos, *gcol_screen_pos;
char *orig_comment_pos, *orig_gcol_screen_pos;
uchar forminfo[288];
uchar *record;
uchar *disk_buff, *strpos, *null_flags, *null_pos;
ulong pos, record_offset, *rec_per_key, rec_buff_length;
rec_per_key_t *rec_per_key_float;
handler *handler_file = 0;
KEY *keyinfo;
KEY_PART_INFO *key_part;
Field **field_ptr;
const char **interval_array;
enum legacy_db_type legacy_db_type;
my_bitmap_map *bitmaps;
uchar *extra_segment_buff = 0;
const uint format_section_header_size = 8;
uchar *format_section_fields = 0;
bool has_vgc = false;
DBUG_TRACE;
new_field_pack_flag = head[27];
new_frm_ver = (head[2] - FRM_VER);
field_pack_length = new_frm_ver < 2 ? 11 : 17;
disk_buff = 0;
error = 3;
/* Position of the form in the form file. */
if (!(pos = get_form_pos(file, head))) goto err; /* purecov: inspected */
mysql_file_seek(file, pos, MY_SEEK_SET, MYF(0));
if (mysql_file_read(file, forminfo, 288, MYF(MY_NABP))) goto err;
frm_context->frm_version = head[2];
/*
Check if .frm file created by MySQL 5.0. In this case we want to
display CHAR fields as CHAR and not as VARCHAR.
We do it this way as we want to keep the old frm version to enable
MySQL 4.1 to read these files.
*/
if (frm_context->frm_version == FRM_VER_TRUE_VARCHAR - 1 && head[33] == 5)
frm_context->frm_version = FRM_VER_TRUE_VARCHAR;
if (*(head + 61) &&
!(frm_context->default_part_db_type =
ha_checktype(thd, (enum legacy_db_type)(uint) * (head + 61), 1, 0)))
goto err;
DBUG_PRINT("info", ("default_part_db_type = %u", head[61]));
legacy_db_type = (enum legacy_db_type)(uint) * (head + 3);
DBUG_ASSERT(share->db_plugin == NULL);
/*
if the storage engine is dynamic, no point in resolving it by its
dynamically allocated legacy_db_type. We will resolve it later by name.
*/
if (legacy_db_type > DB_TYPE_UNKNOWN &&
legacy_db_type < DB_TYPE_FIRST_DYNAMIC)
share->db_plugin =
ha_lock_engine(NULL, ha_checktype(thd, legacy_db_type, 0, 0));
share->db_create_options = db_create_options = uint2korr(head + 30);
share->db_options_in_use = share->db_create_options;
share->mysql_version = uint4korr(head + 51);
frm_context->null_field_first = 0;
if (!head[32]) // New frm file in 3.23
{
share->avg_row_length = uint4korr(head + 34);
share->row_type = (row_type)head[40];
share->table_charset =
get_charset((((uint)head[41]) << 8) + (uint)head[38], MYF(0));
frm_context->null_field_first = 1;
share->stats_sample_pages = uint2korr(head + 42);
share->stats_auto_recalc = static_cast<enum_stats_auto_recalc>(head[44]);
}
if (!share->table_charset) {
/* unknown charset in head[38] or pre-3.23 frm */
if (use_mb(default_charset_info)) {
/* Warn that we may be changing the size of character columns */
LogErr(WARNING_LEVEL, ER_INVALID_CHARSET_AND_DEFAULT_IS_MB,
share->path.str);
}
share->table_charset = default_charset_info;
}
/* Set temporarily a good value for db_low_byte_first */
share->db_low_byte_first = (legacy_db_type != DB_TYPE_ISAM);
error = 4;
share->max_rows = uint4korr(head + 18);
share->min_rows = uint4korr(head + 22);
/* Read keyinformation */
key_info_length = (uint)uint2korr(head + 28);
mysql_file_seek(file, (ulong)uint2korr(head + 6), MY_SEEK_SET, MYF(0));
if (read_string(file, &disk_buff, key_info_length))
goto err; /* purecov: inspected */
if (disk_buff[0] & 0x80) {
share->keys = keys = (disk_buff[1] << 7) | (disk_buff[0] & 0x7f);
share->key_parts = key_parts = uint2korr(disk_buff + 2);
} else {
share->keys = keys = disk_buff[0];
share->key_parts = key_parts = disk_buff[1];
}
share->visible_indexes.init(0);
share->keys_for_keyread.init(0);
share->keys_in_use.init(keys);
strpos = disk_buff + 6;
use_extended_sk = ha_check_storage_engine_flag(share->db_type(),
HTON_SUPPORTS_EXTENDED_KEYS);
uint total_key_parts;
if (use_extended_sk) {
uint primary_key_parts =
keys ? (new_frm_ver >= 3) ? (uint)strpos[4] : (uint)strpos[3] : 0;
total_key_parts = key_parts + primary_key_parts * (keys - 1);
} else
total_key_parts = key_parts;
n_length = keys * sizeof(KEY) + total_key_parts * sizeof(KEY_PART_INFO);
/*
Allocate memory for the KEY object, the key part array, and the
two rec_per_key arrays.
*/
if (!multi_alloc_root(&share->mem_root, &keyinfo,
n_length + uint2korr(disk_buff + 4), &rec_per_key,
sizeof(ulong) * total_key_parts, &rec_per_key_float,
sizeof(rec_per_key_t) * total_key_parts, NULL))
goto err; /* purecov: inspected */
memset(keyinfo, 0, n_length);
share->key_info = keyinfo;
key_part = reinterpret_cast<KEY_PART_INFO *>(keyinfo + keys);
for (i = 0; i < keys; i++, keyinfo++) {
keyinfo->table = 0; // Updated in open_frm
if (new_frm_ver >= 3) {
keyinfo->flags = (uint)uint2korr(strpos) ^ HA_NOSAME;
keyinfo->key_length = (uint)uint2korr(strpos + 2);
keyinfo->user_defined_key_parts = (uint)strpos[4];
keyinfo->algorithm = (enum ha_key_alg)strpos[5];
keyinfo->block_size = uint2korr(strpos + 6);
strpos += 8;
} else {
keyinfo->flags = ((uint)strpos[0]) ^ HA_NOSAME;
keyinfo->key_length = (uint)uint2korr(strpos + 1);
keyinfo->user_defined_key_parts = (uint)strpos[3];
// The algorithm was HA_KEY_ALG_UNDEF in 5.7
keyinfo->algorithm = HA_KEY_ALG_SE_SPECIFIC;
strpos += 4;
}
keyinfo->key_part = key_part;
keyinfo->set_rec_per_key_array(rec_per_key, rec_per_key_float);
keyinfo->set_in_memory_estimate(IN_MEMORY_ESTIMATE_UNKNOWN);
for (j = keyinfo->user_defined_key_parts; j--; key_part++) {
*rec_per_key++ = 0;
*rec_per_key_float++ = REC_PER_KEY_UNKNOWN;
key_part->fieldnr = (uint16)(uint2korr(strpos) & FIELD_NR_MASK);
key_part->offset = (uint)uint2korr(strpos + 2) - 1;
// key_part->field= (Field*) 0; // Will be fixed later
if (new_frm_ver >= 1) {
key_part->key_part_flag = *(strpos + 4);
key_part->length = (uint)uint2korr(strpos + 7);
strpos += 9;
} else {
key_part->length = *(strpos + 4);
key_part->key_part_flag = 0;
if (key_part->length > 128) {
key_part->length &= 127; /* purecov: inspected */
key_part->key_part_flag = HA_REVERSE_SORT; /* purecov: inspected */
}
strpos += 7;
}
key_part->store_length = key_part->length;
}
/*
Add primary key parts if engine supports primary key extension for
secondary keys. Here we add unique first key parts to the end of
secondary key parts array and increase actual number of key parts.
Note that primary key is always first if exists. Later if there is no
primary key in the table then number of actual keys parts is set to
user defined key parts.
*/
keyinfo->actual_key_parts = keyinfo->user_defined_key_parts;
keyinfo->actual_flags = keyinfo->flags;
if (use_extended_sk && i && !(keyinfo->flags & HA_NOSAME)) {
const uint primary_key_parts = share->key_info->user_defined_key_parts;
keyinfo->unused_key_parts = primary_key_parts;
key_part += primary_key_parts;
rec_per_key += primary_key_parts;
rec_per_key_float += primary_key_parts;
share->key_parts += primary_key_parts;
}
}
keynames = (char *)key_part;
strpos += (my_stpcpy(keynames, (char *)strpos) - keynames) + 1;
// reading index comments
for (keyinfo = share->key_info, i = 0; i < keys; i++, keyinfo++) {
if (keyinfo->flags & HA_USES_COMMENT) {
keyinfo->comment.length = uint2korr(strpos);
keyinfo->comment.str = strmake_root(&share->mem_root, (char *)strpos + 2,
keyinfo->comment.length);
strpos += 2 + keyinfo->comment.length;
}
DBUG_ASSERT(MY_TEST(keyinfo->flags & HA_USES_COMMENT) ==
(keyinfo->comment.length > 0));
}
share->reclength = uint2korr((head + 16));
share->stored_rec_length = share->reclength;
if (*(head + 26) == 1) share->system = 1; /* one-record-database */
record_offset = (ulong)(uint2korr(head + 6) + ((uint2korr(head + 14) == 0xffff
? uint4korr(head + 47)
: uint2korr(head + 14))));
if ((n_length = uint4korr(head + 55))) {
/* Read extra data segment */
uchar *next_chunk, *buff_end;
DBUG_PRINT("info", ("extra segment size is %u bytes", n_length));
if (!(extra_segment_buff =
(uchar *)my_malloc(PSI_NOT_INSTRUMENTED, n_length, MYF(MY_WME))))
goto err;
next_chunk = extra_segment_buff;
if (mysql_file_pread(file, extra_segment_buff, n_length,
record_offset + share->reclength, MYF(MY_NABP))) {
goto err;
}
share->connect_string.length = uint2korr(next_chunk);
if (!(share->connect_string.str =
strmake_root(&share->mem_root, (char *)next_chunk + 2,
share->connect_string.length))) {
goto err;
}
next_chunk += share->connect_string.length + 2;
buff_end = extra_segment_buff + n_length;
if (next_chunk + 2 < buff_end) {
uint str_db_type_length = uint2korr(next_chunk);
LEX_CSTRING name;
name.str = (char *)next_chunk + 2;
name.length = str_db_type_length;
plugin_ref tmp_plugin = ha_resolve_by_name(thd, &name, false);
if (tmp_plugin != NULL && !plugin_equals(tmp_plugin, share->db_plugin)) {
if (legacy_db_type > DB_TYPE_UNKNOWN &&
legacy_db_type < DB_TYPE_FIRST_DYNAMIC &&
legacy_db_type !=
ha_legacy_type(plugin_data<handlerton *>(tmp_plugin))) {
/* bad file, legacy_db_type did not match the name */
goto err;
}
/*
tmp_plugin is locked with a local lock.
we unlock the old value of share->db_plugin before
replacing it with a globally locked version of tmp_plugin
*/
plugin_unlock(NULL, share->db_plugin);
share->db_plugin = my_plugin_lock(NULL, &tmp_plugin);
DBUG_PRINT("info", ("setting dbtype to '%.*s' (%d)", str_db_type_length,
next_chunk + 2, ha_legacy_type(share->db_type())));
} else if (!tmp_plugin && name.length == 18 &&
!strncmp(name.str, "PERFORMANCE_SCHEMA", name.length)) {
/*
A FRM file is present on disk,
for a PERFORMANCE_SCHEMA table,
but this server binary is not compiled with the performance_schema,
as ha_resolve_by_name() did not find the storage engine.
This can happen:
- in production, when random binaries (without P_S) are thrown
on top of random installed database instances on disk (with P_S).
For the sake of robustness, pretend the table simply does not exist,
so that in particular it does not pollute the information_schema
with errors when scanning the disk for FRM files.
Note that ER_NO_SUCH_TABLE has a special treatment
in fill_schema_table_by_open()
*/
error = 1;
my_error(ER_NO_SUCH_TABLE, MYF(0), share->db.str,
share->table_name.str);
goto err;
} else if (!tmp_plugin) {
/* purecov: begin inspected */
error = 8;
const_cast<char *>(name.str)[name.length] = 0;
my_error(ER_UNKNOWN_STORAGE_ENGINE, MYF(0), name.str);
goto err;
/* purecov: end */
}
next_chunk += str_db_type_length + 2;
}
if (next_chunk + 5 < buff_end) {
uint32 partition_info_str_len = uint4korr(next_chunk);
if ((share->partition_info_str_len = partition_info_str_len)) {
if (!(share->partition_info_str =
(char *)memdup_root(&share->mem_root, next_chunk + 4,
partition_info_str_len + 1))) {
goto err;
}
}
next_chunk += 5 + partition_info_str_len;
}
if (share->mysql_version >= 50110 && next_chunk < buff_end) {
/* New auto_partitioned indicator introduced in 5.1.11 */
share->auto_partitioned = *next_chunk;
next_chunk++;
}
keyinfo = share->key_info;
for (i = 0; i < keys; i++, keyinfo++) {
if (keyinfo->flags & HA_USES_PARSER) {
if (next_chunk >= buff_end) {
DBUG_PRINT("error",
("fulltext key uses parser that is not defined in .frm"));
goto err;
}
LEX_CSTRING parser_name = {
reinterpret_cast<char *>(next_chunk),
strlen(reinterpret_cast<char *>(next_chunk))};
next_chunk += parser_name.length + 1;
keyinfo->parser =
my_plugin_lock_by_name(NULL, parser_name, MYSQL_FTPARSER_PLUGIN);
if (!keyinfo->parser) {
my_error(ER_PLUGIN_IS_NOT_LOADED, MYF(0), parser_name.str);
goto err;
}
}
}
if (forminfo[46] == (uchar)255) {
// reading long table comment
if (next_chunk + 2 > buff_end) {
DBUG_PRINT("error", ("long table comment is not defined in .frm"));
goto err;
}
share->comment.length = uint2korr(next_chunk);
if (!(share->comment.str =
strmake_root(&share->mem_root, (char *)next_chunk + 2,
share->comment.length))) {
goto err;
}
next_chunk += 2 + share->comment.length;
}
if (next_chunk + format_section_header_size < buff_end) {
/*
New extra data segment called "format section" with additional
table and column properties introduced by MySQL Cluster
based on 5.1.20
Table properties:
TABLESPACE <ts> and STORAGE [DISK|MEMORY]
Column properties:
COLUMN_FORMAT [DYNAMIC|FIXED] and STORAGE [DISK|MEMORY]
*/
DBUG_PRINT("info", ("Found format section"));
/* header */
const uint format_section_length = uint2korr(next_chunk);
const uint format_section_flags = uint4korr(next_chunk + 2);
/* 2 bytes unused */
if (next_chunk + format_section_length > buff_end) {
DBUG_PRINT("error", ("format section length too long: %u",
format_section_length));
goto err;
}
DBUG_PRINT("info", ("format_section_length: %u, format_section_flags: %u",
format_section_length, format_section_flags));
share->default_storage_media =
(enum ha_storage_media)(format_section_flags & 0x7);
/* tablespace */
const char *tablespace =
(const char *)next_chunk + format_section_header_size;
const size_t tablespace_length = strlen(tablespace);
share->tablespace = NULL;
if (tablespace_length) {
Tablespace_name_error_handler error_handler;
thd->push_internal_handler(&error_handler);
bool name_check_error = validate_tablespace_name_length(tablespace);
thd->pop_internal_handler();
if (!name_check_error &&
!(share->tablespace = strmake_root(&share->mem_root, tablespace,
tablespace_length + 1))) {
goto err;
}
}
DBUG_PRINT("info", ("tablespace: '%s'",
share->tablespace ? share->tablespace : "<null>"));
/* pointer to format section for fields */
format_section_fields =
next_chunk + format_section_header_size + tablespace_length + 1;
next_chunk += format_section_length;
}
if (next_chunk + 2 <= buff_end) {
share->compress.length = uint2korr(next_chunk);
if (!(share->compress.str =
strmake_root(&share->mem_root, (char *)next_chunk + 2,
share->compress.length))) {
goto err;
}
next_chunk += 2 + share->compress.length;
}
if (next_chunk + 2 <= buff_end) {
share->encrypt_type.length = uint2korr(next_chunk);
if (!(share->encrypt_type.str =
strmake_root(&share->mem_root, (char *)next_chunk + 2,
share->encrypt_type.length))) {
goto err;
}
next_chunk += 2 + share->encrypt_type.length;
}
}
share->key_block_size = uint2korr(head + 62);
error = 4;
extra_rec_buf_length = uint2korr(head + 59);
rec_buff_length = ALIGN_SIZE(share->reclength + 1 + extra_rec_buf_length);
share->rec_buff_length = rec_buff_length;
if (!(record = (uchar *)share->mem_root.Alloc(rec_buff_length)))
goto err; /* purecov: inspected */
share->default_values = record;
if (mysql_file_pread(file, record, (size_t)share->reclength, record_offset,
MYF(MY_NABP)))
goto err; /* purecov: inspected */
mysql_file_seek(file, pos + 288, MY_SEEK_SET, MYF(0));
share->fields = uint2korr(forminfo + 258);
pos = uint2korr(forminfo + 260); /* Length of all screens */
n_length = uint2korr(forminfo + 268);
interval_count = uint2korr(forminfo + 270);
interval_parts = uint2korr(forminfo + 272);
int_length = uint2korr(forminfo + 274);
share->null_fields = uint2korr(forminfo + 282);
com_length = uint2korr(forminfo + 284);
gcol_screen_length = uint2korr(forminfo + 286);
share->vfields = 0;
frm_context->stored_fields = share->fields;
if (forminfo[46] != (uchar)255) {
share->comment.length = (int)(forminfo[46]);
share->comment.str = strmake_root(&share->mem_root, (char *)forminfo + 47,
share->comment.length);
}
DBUG_PRINT("info", ("i_count: %d i_parts: %d index: %d n_length: %d "
"int_length: %d com_length: %d gcol_screen_length: %d",
interval_count, interval_parts, share->keys, n_length,
int_length, com_length, gcol_screen_length));
if (!(field_ptr = (Field **)share->mem_root.Alloc((uint)(
(share->fields + 1) * sizeof(Field *) +
interval_count * sizeof(TYPELIB) +
(share->fields + interval_parts + keys + 3) * sizeof(char *) +
(n_length + int_length + com_length + gcol_screen_length)))))
goto err; /* purecov: inspected */
share->field = field_ptr;
read_length =
(uint)(share->fields * field_pack_length + pos +
(uint)(n_length + int_length + com_length + gcol_screen_length));
if (read_string(file, &disk_buff, read_length))
goto err; /* purecov: inspected */
strpos = disk_buff + pos;
share->intervals = (TYPELIB *)(field_ptr + share->fields + 1);
interval_array = (const char **)(share->intervals + interval_count);
names = (char *)(interval_array + share->fields + interval_parts + keys + 3);
if (!interval_count) share->intervals = 0; // For better debugging
memcpy(names, strpos + (share->fields * field_pack_length),
(uint)(n_length + int_length));
orig_comment_pos = comment_pos = names + (n_length + int_length);
memcpy(comment_pos, disk_buff + read_length - com_length - gcol_screen_length,
com_length);
orig_gcol_screen_pos = gcol_screen_pos =
names + (n_length + int_length + com_length);
memcpy(gcol_screen_pos, disk_buff + read_length - gcol_screen_length,
gcol_screen_length);
fix_type_pointers(&interval_array, &frm_context->fieldnames, 1, &names);
if (frm_context->fieldnames.count != share->fields) goto err;
fix_type_pointers(&interval_array, share->intervals, interval_count, &names);
{
/* Set ENUM and SET lengths */
TYPELIB *interval;
for (interval = share->intervals;
interval < share->intervals + interval_count; interval++) {
uint count = (uint)(interval->count + 1) * sizeof(uint);
if (!(interval->type_lengths = (uint *)share->mem_root.Alloc(count)))
goto err;
for (count = 0; count < interval->count; count++) {
const char *val = interval->type_names[count];
interval->type_lengths[count] = strlen(val);
}
interval->type_lengths[count] = 0;
}
}
if (keynames)
fix_type_pointers(&interval_array, &share->keynames, 1, &keynames);
/* Allocate handler */
if (!(handler_file =
get_new_handler(share, share->partition_info_str_len != 0,
thd->mem_root, share->db_type())))
goto err;
if (handler_file->set_ha_share_ref(&share->ha_share)) goto err;
if (frm_context->null_field_first) {
null_flags = null_pos = share->default_values;
null_bit_pos = (db_create_options & HA_OPTION_PACK_RECORD) ? 0 : 1;
/*
null_bytes below is only correct under the condition that
there are no bit fields. Correct values is set below after the
table struct is initialized
*/
share->null_bytes = (share->null_fields + null_bit_pos + 7) / 8;
} else {
share->null_bytes = (share->null_fields + 7) / 8;
null_flags = null_pos =
share->default_values + share->reclength - share->null_bytes;
null_bit_pos = 0;
}
use_hash = share->fields >= MAX_FIELDS_BEFORE_HASH;
if (use_hash)
share->name_hash = new collation_unordered_map<std::string, Field **>(
system_charset_info, PSI_INSTRUMENT_ME);
for (i = 0; i < share->fields; i++, strpos += field_pack_length) {
if (new_frm_ver >= 3 &&
(strpos[10] &
FRM_context::GENERATED_FIELD) && // former Field::unireg_check
!(bool)(uint)(gcol_screen_pos[3])) // Field::stored_in_db
{
/*
Skip virtual generated columns as we will do separate pass for them.
We still need to advance pointers to current comment and generated
column info in for such fields.
*/
comment_pos += uint2korr(strpos + 15);
gcol_screen_pos += uint2korr(gcol_screen_pos + 1) + FRM_GCOL_HEADER_SIZE;
has_vgc = true;
} else {
if ((error = make_field_from_frm(
thd, share, frm_context, new_frm_ver, use_hash, i, strpos,
format_section_fields, &comment_pos, &gcol_screen_pos, &null_pos,
&null_bit_pos, &errarg)))
goto err;
}
}
if (has_vgc) {
/*
We need to do separate pass through field descriptions for virtual
generated columns to ensure that they get allocated null/leftover
bits at the tail of record preamble.
*/
strpos = disk_buff + pos;
comment_pos = orig_comment_pos;
gcol_screen_pos = orig_gcol_screen_pos;
// Generated columns can be present only in new .FRMs.
DBUG_ASSERT(new_frm_ver >= 3);
for (i = 0; i < share->fields; i++, strpos += field_pack_length) {
if ((strpos[10] &
FRM_context::GENERATED_FIELD) && // former Field::unireg_check
!(bool)(uint)(gcol_screen_pos[3])) // Field::stored_in_db
{
if ((error = make_field_from_frm(
thd, share, frm_context, new_frm_ver, use_hash, i, strpos,
format_section_fields, &comment_pos, &gcol_screen_pos,
&null_pos, &null_bit_pos, &errarg)))
goto err;
} else {
/*
Advance pointers to current comment and generated columns
info for stored fields.
*/
comment_pos += uint2korr(strpos + 15);
if (strpos[10] &
FRM_context::GENERATED_FIELD) // former Field::unireg_check
{
gcol_screen_pos +=
uint2korr(gcol_screen_pos + 1) + FRM_GCOL_HEADER_SIZE;
}
}
}
}
error = 4;
share->field[share->fields] = 0; // End marker
/* Sanity checks: */
DBUG_ASSERT(share->fields >= frm_context->stored_fields);
DBUG_ASSERT(share->reclength >= share->stored_rec_length);
/* Fix key->name and key_part->field */
if (key_parts) {
const int pk_off =
find_type(primary_key_name, &share->keynames, FIND_TYPE_NO_PREFIX);
uint primary_key = (pk_off > 0 ? pk_off - 1 : MAX_KEY);
longlong ha_option = handler_file->ha_table_flags();
keyinfo = share->key_info;
key_part = keyinfo->key_part;
for (uint key = 0; key < share->keys; key++, keyinfo++) {
uint usable_parts = 0;
keyinfo->name = share->keynames.type_names[key];
/* Fix fulltext keys for old .frm files */
if (share->key_info[key].flags & HA_FULLTEXT)
share->key_info[key].algorithm = HA_KEY_ALG_FULLTEXT;
if (primary_key >= MAX_KEY && (keyinfo->flags & HA_NOSAME)) {
/*
If the UNIQUE key doesn't have NULL columns and is not a part key
declare this as a primary key.
*/
primary_key = key;
for (i = 0; i < keyinfo->user_defined_key_parts; i++) {
DBUG_ASSERT(key_part[i].fieldnr > 0);
// Table field corresponding to the i'th key part.
Field *table_field = share->field[key_part[i].fieldnr - 1];
// Index on virtual generated columns is not allowed to be PK
// even when the conditions below are true, so this case must be
// rejected here.
if (table_field->is_virtual_gcol()) {
primary_key = MAX_KEY; // Can't be used
break;
}
/*
If the key column is of NOT NULL BLOB type, then it
will definitly have key prefix. And if key part prefix size
is equal to the BLOB column max size, then we can promote
it to primary key.
*/
if (!table_field->real_maybe_null() &&
table_field->type() == MYSQL_TYPE_BLOB &&
table_field->field_length == key_part[i].length)
continue;
if (table_field->real_maybe_null() ||
table_field->key_length() != key_part[i].length)
{
primary_key = MAX_KEY; // Can't be used
break;
}
}
}
for (i = 0; i < keyinfo->user_defined_key_parts; key_part++, i++) {
Field *field;
if (new_field_pack_flag <= 1)
key_part->fieldnr = (uint16)find_field(
share->field, share->default_values, (uint)key_part->offset,
(uint)key_part->length);
if (!key_part->fieldnr) {
error = 4; // Wrong file
goto err;
}
field = key_part->field = share->field[key_part->fieldnr - 1];
key_part->type = field->key_type();
if (field->real_maybe_null()) {
key_part->null_offset = field->null_offset(share->default_values);
key_part->null_bit = field->null_bit;
key_part->store_length += HA_KEY_NULL_LENGTH;
keyinfo->flags |= HA_NULL_PART_KEY;
keyinfo->key_length += HA_KEY_NULL_LENGTH;
}
if (field->type() == MYSQL_TYPE_BLOB ||
field->real_type() == MYSQL_TYPE_VARCHAR ||
field->type() == MYSQL_TYPE_GEOMETRY) {
key_part->store_length += HA_KEY_BLOB_LENGTH;
if (i + 1 <= keyinfo->user_defined_key_parts)
keyinfo->key_length += HA_KEY_BLOB_LENGTH;
}
key_part->init_flags();
if (field->is_virtual_gcol()) keyinfo->flags |= HA_VIRTUAL_GEN_KEY;
setup_key_part_field(share, handler_file, primary_key, keyinfo, key, i,
&usable_parts, true);
field->flags |= PART_KEY_FLAG;
if (key == primary_key) {
field->flags |= PRI_KEY_FLAG;
/*
If this field is part of the primary key and all keys contains
the primary key, then we can use any key to find this column
*/
if (ha_option & HA_PRIMARY_KEY_IN_READ_INDEX) {
if (field->key_length() == key_part->length &&
!(field->flags & BLOB_FLAG))
field->part_of_key = share->keys_in_use;
if (field->part_of_sortkey.is_set(key))
field->part_of_sortkey = share->keys_in_use;
}
}
if (field->key_length() != key_part->length) {
if (field->type() == MYSQL_TYPE_NEWDECIMAL) {
/*
Fix a fatal error in decimal key handling that causes crashes
on Innodb. We fix it by reducing the key length so that
InnoDB never gets a too big key when searching.
This allows the end user to do an ALTER TABLE to fix the
error.
*/
keyinfo->key_length -= (key_part->length - field->key_length());
key_part->store_length -=
(uint16)(key_part->length - field->key_length());
key_part->length = (uint16)field->key_length();
LogErr(ERROR_LEVEL, ER_TABLE_WRONG_KEY_DEFINITION,
share->table_name.str, share->table_name.str);
push_warning_printf(thd, Sql_condition::SL_WARNING,
ER_CRASHED_ON_USAGE,
"Found wrong key definition in %s; "
"Please do \"ALTER TABLE `%s` FORCE\" to fix "
"it!",
share->table_name.str, share->table_name.str);
share->crashed = 1; // Marker for CHECK TABLE
continue;
}
key_part->key_part_flag |= HA_PART_KEY_SEG;
}
}
if (use_extended_sk && primary_key < MAX_KEY && key &&
!(keyinfo->flags & HA_NOSAME))
key_part +=
add_pk_parts_to_sk(keyinfo, key, share->key_info, primary_key,
share, handler_file, &usable_parts);
/* Skip unused key parts if they exist */
key_part += keyinfo->unused_key_parts;
keyinfo->usable_key_parts = usable_parts; // Filesort
set_if_bigger(share->max_key_length,
keyinfo->key_length + keyinfo->user_defined_key_parts);
share->total_key_length += keyinfo->key_length;
/*
MERGE tables do not have unique indexes. But every key could be
an unique index on the underlying MyISAM table. (Bug #10400)
*/
if ((keyinfo->flags & HA_NOSAME) ||
(ha_option & HA_ANY_INDEX_MAY_BE_UNIQUE))
set_if_bigger(share->max_unique_length, keyinfo->key_length);
}
if (primary_key < MAX_KEY && (share->keys_in_use.is_set(primary_key))) {
share->primary_key = primary_key;
/*
If we are using an integer as the primary key then allow the user to
refer to it as '_rowid'
*/
if (share->key_info[primary_key].user_defined_key_parts == 1) {
Field *field = share->key_info[primary_key].key_part[0].field;
if (field && field->result_type() == INT_RESULT) {
/* note that fieldnr here (and rowid_field_offset) starts from 1 */
share->rowid_field_offset =
(share->key_info[primary_key].key_part[0].fieldnr);
}
}
} else
share->primary_key = MAX_KEY; // we do not have a primary key
} else
share->primary_key = MAX_KEY;
my_free(disk_buff);
disk_buff = 0;
if (new_field_pack_flag <= 1) {
/* Old file format with default as not null */
uint null_length = (share->null_fields + 7) / 8;
memset(share->default_values + (null_flags - record), 255, null_length);
}
if (share->found_next_number_field) {
Field *reg_field = *share->found_next_number_field;
if ((int)(share->next_number_index = (uint)find_ref_key(
share->key_info, share->keys, share->default_values,
reg_field, &share->next_number_key_offset,
&share->next_number_keypart)) < 0) {
/* Wrong field definition */
error = 4;
goto err;
} else
reg_field->flags |= AUTO_INCREMENT_FLAG;
}
if (share->blob_fields) {
Field **ptr;
uint k, *save;
/* Store offsets to blob fields to find them fast */
if (!(share->blob_field = save = (uint *)share->mem_root.Alloc(
(uint)(share->blob_fields * sizeof(uint)))))
goto err;
for (k = 0, ptr = share->field; *ptr; ptr++, k++) {
if ((*ptr)->flags & BLOB_FLAG) (*save++) = k;
}
}
/*
the correct null_bytes can now be set, since bitfields have been taken
into account
*/
share->null_bytes = (null_pos - null_flags + (null_bit_pos + 7) / 8);
share->last_null_bit_pos = null_bit_pos;
share->db_low_byte_first = handler_file->low_byte_first();
share->column_bitmap_size = bitmap_buffer_size(share->fields);
if (!(bitmaps =
(my_bitmap_map *)share->mem_root.Alloc(share->column_bitmap_size)))
goto err;
bitmap_init(&share->all_set, bitmaps, share->fields, false);
bitmap_set_all(&share->all_set);
destroy(handler_file);
my_free(extra_segment_buff);
return 0;
err:
my_free(disk_buff);
my_free(extra_segment_buff);
destroy(handler_file);
delete share->name_hash;
share->name_hash = nullptr;
open_table_error(thd, share, error, my_errno());
return error;
} /*open_binary_frm*/
//////////////////////////////////////////////////////////////////////////
/**
Validate the expression to see whether there are invalid Item objects.
Needs to be done after fix_fields to allow checking references
to other generated columns, default value expressions or check constraints.
@param expr Pointer to the expression
@param source Source of value generator(a generated column, a regular
column with generated default value or
a check constraint).
@param source_name Name of the source (generated column, a reguler column
with generated default value or a check constraint).
@param column_index The column order.
@retval true The generated expression has some invalid objects
@retval false No illegal objects in the generated expression
*/
static bool validate_value_generator_expr(Item *expr,
Value_generator_source source,
const char *source_name,
int column_index) {
DBUG_TRACE;
DBUG_ASSERT(expr);
// Map to get actual error code from error_type for the source.
enum error_type { ER_NAME_FUNCTION, ER_FUNCTION, ER_VARIABLES, MAX_ERROR };
uint error_code_map[][MAX_ERROR] = {
// Generated column errors.
{ER_GENERATED_COLUMN_NAMED_FUNCTION_IS_NOT_ALLOWED,
ER_GENERATED_COLUMN_FUNCTION_IS_NOT_ALLOWED,
ER_GENERATED_COLUMN_VARIABLES},
// Default expressions errors.
{ER_DEFAULT_VAL_GENERATED_NAMED_FUNCTION_IS_NOT_ALLOWED,
ER_DEFAULT_VAL_GENERATED_FUNCTION_IS_NOT_ALLOWED,
ER_DEFAULT_VAL_GENERATED_VARIABLES},
// Check constraint errors.
{ER_CHECK_CONSTRAINT_NAMED_FUNCTION_IS_NOT_ALLOWED,
ER_CHECK_CONSTRAINT_FUNCTION_IS_NOT_ALLOWED,
ER_CHECK_CONSTRAINT_VARIABLES}};
uint err_code = error_code_map[source][ER_NAME_FUNCTION];
// No non-deterministic functions are allowed as GC but most of them are
// allowed as default value expressions
if ((expr->used_tables() & RAND_TABLE_BIT &&
(source == VGS_GENERATED_COLUMN))) {
Item_func *func_item;
if (expr->type() == Item::FUNC_ITEM &&
((func_item = down_cast<Item_func *>(expr)))) {
my_error(err_code, MYF(0), source_name, func_item->func_name());
return true;
} else {
my_error(error_code_map[source][ER_FUNCTION], MYF(0), source_name);
return true;
}
}
// System variables or parameters are not allowed
else if (expr->used_tables() & INNER_TABLE_BIT) {
my_error(error_code_map[source][ER_VARIABLES], MYF(0), source_name);
return true;
}
// Assert that we aren't dealing with ROW values (rejected in
// pre_validate_value_generator_expr()).
DBUG_ASSERT(expr->cols() == 1);
// Sub-queries are not allowed (already checked by parser, hence the assert)
DBUG_ASSERT(!expr->has_subquery());
/*
Walk through the Item tree, checking the validity of items
belonging to the expression.
*/
Check_function_as_value_generator_parameters checker_args(err_code, source);
checker_args.col_index = column_index;
if (expr->walk(&Item::check_function_as_value_generator, enum_walk::POSTFIX,
pointer_cast<uchar *>(&checker_args))) {
my_error(checker_args.err_code, MYF(0), source_name,
checker_args.banned_function_name);
return true;
}
// Stored programs are not allowed. This case is already covered, but still
// keeping it here as a safetynet.
if (expr->has_stored_program()) {
/* purecov: begin deadcode */
DBUG_ASSERT(false);
my_error(err_code, MYF(0), source_name, "stored progam");
return true;
/* purecov: end */
}
return false;
}
/**
Process the generated expression, generated default value of the column or
check constraint expression.
@param thd The thread object
@param table The table to which the column belongs
@param val_generator The expression to unpack
@param source Source of value generator(a generated column, a regular
column with generated default value or
a check constraint).
@param source_name Name of the source (generated column, a reguler column
with generated default value or a check constraint).
@param field Field to which the val_generator is attached to for
generated columns and default expression.
@retval true An error occurred, something was wrong with the function.
@retval false Ok, generated expression is fixed sucessfully
*/
static bool fix_value_generators_fields(THD *thd, TABLE *table,
Value_generator *val_generator,
Value_generator_source source,
const char *source_name, Field *field) {
uint dir_length, home_dir_length;
bool result = true;
Item *func_expr = val_generator->expr_item;
TABLE_LIST tables;
TABLE_LIST *save_table_list, *save_first_table, *save_last_table;
int error;
Name_resolution_context *context;
const char *save_where;
char *db_name;
char db_name_string[FN_REFLEN];
bool save_use_only_table_context;
std::unique_ptr<Functional_index_error_handler>
functional_index_error_handler;
enum_mark_columns save_mark_used_columns = thd->mark_used_columns;
DBUG_ASSERT(func_expr);
DBUG_TRACE;
// Insert a error handler that takes care of converting column names to
// functional index names. Since functional indexes is implemented as
// indexed hidden generated columns, we may end up printing out the
// auto-generated column name if we don't have an extra error handler.
if (source == VGS_GENERATED_COLUMN)
functional_index_error_handler =
std::unique_ptr<Functional_index_error_handler>(
new Functional_index_error_handler(field, thd));
/*
Set-up the TABLE_LIST object to be a list with a single table
Set alias and real name to table name and get database name from file name.
*/
tables.alias = tables.table_name = table->s->table_name.str;
tables.table = table;
tables.next_local = 0;
tables.next_name_resolution_table = 0;
my_stpmov(db_name_string, table->s->normalized_path.str);
dir_length = dirname_length(db_name_string);
db_name_string[dir_length ? dir_length - 1 : 0] = 0;
home_dir_length = dirname_length(db_name_string);
db_name = &db_name_string[home_dir_length];
tables.db = db_name;
thd->mark_used_columns = MARK_COLUMNS_NONE;
context = thd->lex->current_context();
table->get_fields_in_item_tree = true;
save_table_list = context->table_list;
save_first_table = context->first_name_resolution_table;
save_last_table = context->last_name_resolution_table;
context->table_list = &tables;
context->first_name_resolution_table = &tables;
context->last_name_resolution_table = nullptr;
func_expr->walk(&Item::change_context_processor, enum_walk::POSTFIX,
(uchar *)context);
save_where = thd->where;
dd::String_type where_str;
if (source == VGS_GENERATED_COLUMN || source == VGS_DEFAULT_EXPRESSION) {
thd->where = field->is_field_for_functional_index()
? "functional index"
: (source == VGS_GENERATED_COLUMN)
? "generated column function"
: "default value expression";
} else {
DBUG_ASSERT(source == VGS_CHECK_CONSTRAINT);
where_str =
"check constraint " + dd::String_type(source_name) + " expression";
thd->where = where_str.c_str();
}
/* Save the context before fixing the fields*/
save_use_only_table_context = thd->lex->use_only_table_context;
thd->lex->use_only_table_context = true;
bool charset_switched = false;
const CHARSET_INFO *saved_collation_connection = func_expr->default_charset();
if (saved_collation_connection != table->s->table_charset) {
thd->variables.collation_connection = table->s->table_charset;
charset_switched = true;
}
Item *new_func = func_expr;
if (field && field->is_field_for_functional_index())
func_expr->allow_array_cast();
error = func_expr->fix_fields(thd, &new_func);
/* Virtual columns expressions that substitute themselves are invalid */
DBUG_ASSERT(new_func == func_expr);
/* Restore the current connection character set and collation. */
if (charset_switched)
thd->variables.collation_connection = saved_collation_connection;
/* Restore the original context*/
thd->lex->use_only_table_context = save_use_only_table_context;
context->table_list = save_table_list;
context->first_name_resolution_table = save_first_table;
context->last_name_resolution_table = save_last_table;
/*
Above, 'context' is either the one of unpack_value_generator()'s temporary
fresh LEX 'new_lex', or the one of the top query as used in
TABLE::refix_value_generator_items(). None of them reflects where the val
generator is situated in the query. Moreover, a gcol_info may be shared
by N references to the same gcol, each ref being in a different context
(top query, subquery). So, underlying items are not situated in a defined
place: give them a null context.
*/
func_expr->walk(&Item::change_context_processor, enum_walk::POSTFIX, nullptr);
if (unlikely(error)) {
DBUG_PRINT("info",
("Field in generated column function not part of table"));
goto end;
}
thd->where = save_where;
/*
Checking if all items are valid to be part of the expression.
*/
if (validate_value_generator_expr(func_expr, source, source_name,
field ? field->field_index : 0))
goto end;
result = false;
func_expr->walk(&Item::strip_db_table_name_processor, enum_walk::POSTFIX,
nullptr);
end:
table->get_fields_in_item_tree = false;
thd->mark_used_columns = save_mark_used_columns;
return result;
}
/**
Calculate the base_columns_map and num_non_virtual_base_cols members of
this generated column
@param table Table with the checked field
@retval true if error
*/
bool Value_generator::register_base_columns(TABLE *table) {
DBUG_TRACE;
my_bitmap_map *bitbuf = static_cast<my_bitmap_map *>(
table->mem_root.Alloc(bitmap_buffer_size(table->s->fields)));
DBUG_ASSERT(num_non_virtual_base_cols == 0);
bitmap_init(&base_columns_map, bitbuf, table->s->fields, 0);
MY_BITMAP *save_old_read_set = table->read_set;
table->read_set = &base_columns_map;
Mark_field mark_fld(MARK_COLUMNS_TEMP);
expr_item->walk(&Item::mark_field_in_map, enum_walk::PREFIX,
(uchar *)&mark_fld);
table->read_set = save_old_read_set;
/* Calculate the number of non-virtual base columns */
for (uint i = 0; i < table->s->fields; i++) {
Field *field = table->field[i];
if (bitmap_is_set(&base_columns_map, field->field_index) &&
field->stored_in_db)
num_non_virtual_base_cols++;
}
return false;
}
void Value_generator::dup_expr_str(MEM_ROOT *root, const char *src,
size_t len) {
expr_str.str = pointer_cast<char *>(memdup_root(root, src, len));
expr_str.length = len;
}
void Value_generator::print_expr(THD *thd, String *out) {
out->length(0);
Sql_mode_parse_guard parse_guard(thd);
// Printing db and table name is useless
auto flags = enum_query_type(QT_NO_DB | QT_NO_TABLE | QT_FORCE_INTRODUCERS);
expr_item->print(thd, out, flags);
}
bool unpack_value_generator(THD *thd, TABLE *table,
Value_generator **val_generator,
Value_generator_source source,
const char *source_name, Field *field,
bool is_create_table, bool *error_reported) {
DBUG_TRACE;
DBUG_ASSERT(field == nullptr || field->table == table);
LEX_STRING *val_gen_expr = &(*val_generator)->expr_str;
DBUG_ASSERT(val_gen_expr);
DBUG_ASSERT(!(*val_generator)->expr_item); // No Item in TABLE_SHARE
/*
Step 1: Construct a statement for the parser.
The parsed string needs to take the following format:
"PARSE_GCOL_EXPR (<expr_string_from_frm>)"
*/
char *gcol_expr_str;
int str_len = 0;
const CHARSET_INFO *old_character_set_client;
bool disable_strict_mode = false;
bool status;
Strict_error_handler strict_handler;
LEX *const old_lex = thd->lex;
LEX new_lex;
thd->lex = &new_lex;
if (lex_start(thd)) {
thd->lex = old_lex;
return true; // OOM
}
if (!(gcol_expr_str = (char *)table->mem_root.Alloc(
val_gen_expr->length + PARSE_GCOL_KEYWORD.length + 3))) {
return true;
}
memcpy(gcol_expr_str, PARSE_GCOL_KEYWORD.str, PARSE_GCOL_KEYWORD.length);
str_len = PARSE_GCOL_KEYWORD.length;
memcpy(gcol_expr_str + str_len, "(", 1);
str_len++;
memcpy(gcol_expr_str + str_len, val_gen_expr->str, val_gen_expr->length);
str_len += val_gen_expr->length;
memcpy(gcol_expr_str + str_len, ")", 1);
str_len++;
memcpy(gcol_expr_str + str_len, "\0", 1);
str_len++;
Gcol_expr_parser_state parser_state;
parser_state.init(thd, gcol_expr_str, str_len);
/*
Step 2: Setup thd for parsing.
*/
Query_arena *backup_stmt_arena_ptr = thd->stmt_arena;
Query_arena backup_arena;
Query_arena gcol_arena(&table->mem_root, Query_arena::STMT_REGULAR_EXECUTION);
thd->swap_query_arena(gcol_arena, &backup_arena);
thd->stmt_arena = &gcol_arena;
ulong save_old_privilege = thd->want_privilege;
thd->want_privilege = 0;
old_character_set_client = thd->variables.character_set_client;
// Subquery is not allowed in generated expression
const bool save_allow_subselects = thd->lex->expr_allows_subselect;
thd->lex->expr_allows_subselect = false;
// allow_sum_func is also 0, banning group aggregates and window functions.
/*
Step 3: Use the parser to build an Item object from.
*/
if (parse_sql(thd, &parser_state, NULL)) {
goto parse_err;
}
thd->lex->expr_allows_subselect = save_allow_subselects;
/*
From now on use val_generator generated by the parser. It has an
expr_item, and no expr_str.
*/
*val_generator = parser_state.result;
/* Keep attribute of generated column */
if (field != nullptr) (*val_generator)->set_field_stored(field->stored_in_db);
DBUG_ASSERT((*val_generator)->expr_item && !(*val_generator)->expr_str.str);
/* Use strict mode regardless of strict mode setting when validating */
if (!thd->is_strict_mode()) {
thd->variables.sql_mode |= MODE_STRICT_ALL_TABLES;
thd->push_internal_handler(&strict_handler);
disable_strict_mode = true;
}
/* Validate the Item tree. */
status = fix_value_generators_fields(thd, table, (*val_generator), source,
source_name, field);
// Permanent changes to the item_tree are completed.
if (!thd->lex->is_ps_or_view_context_analysis())
(*val_generator)->permanent_changes_completed = true;
if (disable_strict_mode) {
thd->pop_internal_handler();
thd->variables.sql_mode &= ~MODE_STRICT_ALL_TABLES;
}
if (status) {
if (is_create_table) {
/*
During CREATE/ALTER TABLE it is ok to receive errors here.
It is not ok if it happens during the opening of an frm
file as part of a normal query.
*/
*error_reported = true;
}
// Any memory allocated in this function is freed in parse_err
*val_generator = nullptr;
goto parse_err;
}
if ((*val_generator)->register_base_columns(table)) goto parse_err;
lex_end(thd->lex);
thd->lex = old_lex;
(*val_generator)->backup_stmt_unsafe_flags(new_lex.get_stmt_unsafe_flags());
thd->stmt_arena = backup_stmt_arena_ptr;
thd->swap_query_arena(backup_arena, &gcol_arena);
(*val_generator)->item_list = gcol_arena.item_list();
thd->want_privilege = save_old_privilege;
thd->lex->expr_allows_subselect = save_allow_subselects;
return false;
parse_err:
// Any created window is eliminated as not allowed:
thd->lex->current_select()->m_windows.empty();
thd->free_items();
lex_end(thd->lex);
thd->lex = old_lex;
thd->stmt_arena = backup_stmt_arena_ptr;
thd->swap_query_arena(backup_arena, &gcol_arena);
thd->variables.character_set_client = old_character_set_client;
thd->want_privilege = save_old_privilege;
thd->lex->expr_allows_subselect = save_allow_subselects;
return true;
}
// Unpack partition
bool unpack_partition_info(THD *thd, TABLE *outparam, TABLE_SHARE *share,
handlerton *engine_type, bool is_create_table) {
/*
Currently we still need to run the parser for extracting
Item trees (for partition expression and COLUMNS values).
To avoid too big refactoring in this patch, we still generate
the syntax when reading the DD (read_from_dd_partitions) and
parse it for each TABLE instance.
TODO:
To avoid multiple copies of information, we should try to
point to the TABLE_SHARE where possible:
- partition names etc. I.e. reuse the partition_elements!
This is not possible with columns partitions, since they use
Item for storing the values!?
Also make sure that part_state is never altered without proper locks
(like MDL exclusive locks on the table! since they would be shared by all
instances of a table!)
TODO: Use field images instead?
TODO: Look on how DEFAULT values will be stored in the new DD
and reuse that if possible!
TODO: wl#7840 to get a more light weight parsing of expressions
Create a new partition_info object on the table's mem_root,
by parsing a minimalistic string generated from the share.
And then fill in the missing parts from the part_info on the share.
*/
/*
In this execution we must avoid calling thd->change_item_tree since
we might release memory before statement is completed. We do this
by changing to a new statement arena. As part of this arena we also
set the memory root to be the memory root of the table since we
call the parser and fix_fields which both can allocate memory for
item objects. We keep the arena to ensure that we can release the
item list when closing the table object.
SEE Bug #21658
*/
// Can use TABLE's mem_root, as it's surely not an internal tmp table
DBUG_ASSERT(share->table_category != TABLE_CATEGORY_TEMPORARY);
Query_arena *backup_stmt_arena_ptr = thd->stmt_arena;
Query_arena backup_arena;
Query_arena part_func_arena(&outparam->mem_root,
Query_arena::STMT_INITIALIZED);
thd->swap_query_arena(part_func_arena, &backup_arena);
thd->stmt_arena = &part_func_arena;
bool tmp;
bool work_part_info_used;
tmp = mysql_unpack_partition(
thd, share->partition_info_str, share->partition_info_str_len, outparam,
is_create_table, engine_type, &work_part_info_used);
if (tmp) {
thd->stmt_arena = backup_stmt_arena_ptr;
thd->swap_query_arena(backup_arena, &part_func_arena);
return true;
}
outparam->part_info->is_auto_partitioned = share->auto_partitioned;
DBUG_PRINT("info", ("autopartitioned: %u", share->auto_partitioned));
/*
We should perform the fix_partition_func in either local or
caller's arena depending on work_part_info_used value.
*/
if (!work_part_info_used)
tmp = fix_partition_func(thd, outparam, is_create_table);
thd->stmt_arena = backup_stmt_arena_ptr;
thd->swap_query_arena(backup_arena, &part_func_arena);
if (!tmp) {
if (work_part_info_used)
tmp = fix_partition_func(thd, outparam, is_create_table);
}
outparam->part_info->item_list = part_func_arena.item_list();
// TODO: Compare with share->part_info for validation of code!
DBUG_ASSERT(!share->m_part_info || share->m_part_info->column_list ==
outparam->part_info->column_list);
DBUG_ASSERT(!share->m_part_info ||
outparam->part_info->list_of_part_fields ==
share->m_part_info->list_of_part_fields);
// part_info->part_expr->table_name and
// part_info->subpart_expr->table_name will have been set to
// TABLE::alias (passed on from Field). But part_info cannot refer
// to TABLE::alias since this may be changed when the table object
// is reused. Traverse part_expr and subpart_expr and set table_name
// to nullptr, to avoid dereferencing an invalid pointer.
// @todo bug#29354690: When part_info handling is refactored and properly
// attached to a single TABLE object, this extra code can be
// deleted.
if (outparam->part_info->part_expr != nullptr) {
outparam->part_info->part_expr->walk(&Item::set_table_name,
enum_walk::SUBQUERY_POSTFIX, nullptr);
}
if (outparam->part_info->subpart_expr != nullptr) {
outparam->part_info->subpart_expr->walk(
&Item::set_table_name, enum_walk::SUBQUERY_POSTFIX, nullptr);
}
return tmp;
}
/**
Open a table based on a TABLE_SHARE
@param thd Thread handler
@param share Table definition
@param alias Alias for table
@param db_stat Open flags (for example HA_OPEN_KEYFILE|
HA_OPEN_RNDFILE..) can be 0 (example in
ha_example_table)
@param prgflag READ_ALL etc..
@param ha_open_flags HA_OPEN_ABORT_IF_LOCKED etc..
@param outparam Result table.
@param is_create_table Indicates that table is opened as part
of CREATE or ALTER and does not yet exist in SE.
@param table_def_param dd::Table object describing the table to be
opened in SE. Can be nullptr, which case this
function will try to retrieve such object from
the data-dictionary before opening table in SE.
@retval 0 ok
@retval 1 Error (see open_table_error)
@retval 2 Error (see open_table_error)
@retval 4 Error (see open_table_error)
@retval 7 Table definition has changed in engine
@retval 8 Table row format has changed in engine
*/
int open_table_from_share(THD *thd, TABLE_SHARE *share, const char *alias,
uint db_stat, uint prgflag, uint ha_open_flags,
TABLE *outparam, bool is_create_table,
const dd::Table *table_def_param) {
int error;
uint records, i, bitmap_size;
bool error_reported = false;
bool has_default_values = false;
const bool internal_tmp = share->table_category == TABLE_CATEGORY_TEMPORARY;
DBUG_ASSERT(!internal_tmp || share->ref_count() != 0);
uchar *record, *bitmaps;
Field **field_ptr;
Field *fts_doc_id_field = NULL;
ptrdiff_t move_offset;
DBUG_TRACE;
DBUG_PRINT("enter", ("name: '%s.%s' form: %p", share->db.str,
share->table_name.str, outparam));
error = 1;
new (outparam) TABLE();
outparam->in_use = thd;
outparam->s = share;
outparam->db_stat = db_stat;
outparam->write_row_record = NULL;
MEM_ROOT *root;
if (!internal_tmp) {
root = &outparam->mem_root;
init_sql_alloc(key_memory_TABLE, root, TABLE_ALLOC_BLOCK_SIZE, 0);
} else
root = &share->mem_root;
/*
For internal temporary tables we allocate the 'alias' in the
TABLE_SHARE's mem_root rather than on the heap as it gives simpler
freeing.
*/
outparam->alias = internal_tmp
? strdup_root(root, alias)
: my_strdup(key_memory_TABLE, alias, MYF(MY_WME));
if (!outparam->alias) goto err;
outparam->quick_keys.init();
outparam->possible_quick_keys.init();
outparam->covering_keys.init();
outparam->merge_keys.init();
outparam->keys_in_use_for_query.init();
/* Allocate handler */
outparam->file = 0;
if (!(prgflag & SKIP_NEW_HANDLER)) {
if (!(outparam->file = get_new_handler(share, share->m_part_info != NULL,
root, share->db_type())))
goto err;
if (outparam->file->set_ha_share_ref(&share->ha_share)) goto err;
} else {
DBUG_ASSERT(!db_stat);
}
error = 4;
outparam->reginfo.lock_type = TL_UNLOCK;
outparam->current_lock = F_UNLCK;
records = 0;
if ((db_stat & HA_OPEN_KEYFILE) || (prgflag & DELAYED_OPEN)) records = 1;
if (prgflag & (READ_ALL + EXTRA_RECORD)) records++;
record = root->ArrayAlloc<uchar>(share->rec_buff_length * records +
share->null_bytes);
if (record == NULL) goto err; /* purecov: inspected */
if (records == 0) {
/* We are probably in hard repair, and the buffers should not be used */
outparam->record[0] = outparam->record[1] = share->default_values;
has_default_values = true;
} else {
outparam->record[0] = record;
if (records > 1)
outparam->record[1] = record + share->rec_buff_length;
else
outparam->record[1] = outparam->record[0]; // Safety
}
outparam->null_flags_saved = record + (records * share->rec_buff_length);
memset(outparam->null_flags_saved, '\0', share->null_bytes);
if (!(field_ptr = root->ArrayAlloc<Field *>(share->fields + 1)))
goto err; /* purecov: inspected */
outparam->field = field_ptr;
record = (uchar *)outparam->record[0] - 1; /* Fieldstart = 1 */
outparam->null_flags = (uchar *)record + 1;
/*
We will create fields by cloning TABLE_SHARE's fields; then we will need
to make all new fields' pointers point into the new TABLE's record[0], by
applying an offset to them.
Calculate the "source" offset depending on table type:
- For non-internal temporary tables, source is share->default_values
- For internal tables, source is first TABLE's record[0], which
happens to be created in same memory block as share->default_values, with
offset 2 * share->rec_buff_length (see create_tmp_table()).
*/
move_offset = outparam->record[0] - share->default_values +
(internal_tmp ? 2 * share->rec_buff_length : 0);
/* Setup copy of fields from share, but use the right alias and record */
for (i = 0; i < share->fields; i++, field_ptr++) {
Field *new_field = share->field[i]->clone(root);
*field_ptr = new_field;
if (new_field == NULL) goto err;
new_field->init(outparam);
new_field->move_field_offset(move_offset);
/*
Initialize Field::pack_length() number of bytes for new_field->ptr
only if there are no default values for the field.
*/
if (!has_default_values)
memset(new_field->ptr, 0, new_field->pack_length());
/* Check if FTS_DOC_ID column is present in the table */
if (outparam->file &&
(outparam->file->ha_table_flags() & HA_CAN_FULLTEXT_EXT) &&
!strcmp(outparam->field[i]->field_name, FTS_DOC_ID_COL_NAME))
fts_doc_id_field = new_field;
}
(*field_ptr) = 0; // End marker
if (share->found_next_number_field)
outparam->found_next_number_field =
outparam->field[(uint)(share->found_next_number_field - share->field)];
/* Fix key->name and key_part->field */
if (share->key_parts) {
KEY *key_info, *key_info_end;
KEY_PART_INFO *key_part;
uint n_length;
n_length =
share->keys * sizeof(KEY) + share->key_parts * sizeof(KEY_PART_INFO);
if (!(key_info = (KEY *)root->Alloc(n_length))) goto err;
outparam->key_info = key_info;
key_part = (reinterpret_cast<KEY_PART_INFO *>(key_info + share->keys));
memcpy(key_info, share->key_info, sizeof(*key_info) * share->keys);
memcpy(key_part, share->key_info[0].key_part,
(sizeof(*key_part) * share->key_parts));
for (key_info_end = key_info + share->keys; key_info < key_info_end;
key_info++) {
KEY_PART_INFO *key_part_end;
key_info->table = outparam;
key_info->key_part = key_part;
for (key_part_end = key_part + key_info->actual_key_parts;
key_part < key_part_end; key_part++) {
Field *field = key_part->field = outparam->field[key_part->fieldnr - 1];
if (field->key_length() != key_part->length &&
!(field->flags & BLOB_FLAG)) {
/*
We are using only a prefix of the column as a key:
Create a new field for the key part that matches the index
*/
field = key_part->field = field->new_field(root, outparam, 0);
field->set_field_length(key_part->length);
}
}
/* Skip unused key parts if they exist */
key_part += key_info->unused_key_parts;
/* Set TABLE::fts_doc_id_field for tables with FT KEY */
if ((key_info->flags & HA_FULLTEXT))
outparam->fts_doc_id_field = fts_doc_id_field;
}
}
// Parse partition expression and create Items
if (share->partition_info_str_len && outparam->file &&
unpack_partition_info(thd, outparam, share,
share->m_part_info->default_engine_type,
is_create_table)) {
if (is_create_table) {
/*
During CREATE/ALTER TABLE it is ok to receive errors here.
It is not ok if it happens during the opening of an frm
file as part of a normal query.
*/
error_reported = true;
}
goto err;
}
/* Check generated columns against table's storage engine. */
if (share->vfields && outparam->file &&
!(outparam->file->ha_table_flags() & HA_GENERATED_COLUMNS)) {
my_error(ER_UNSUPPORTED_ACTION_ON_GENERATED_COLUMN, MYF(0),
"Specified storage engine");
error_reported = true;
goto err;
}
/*
Allocate bitmaps
This needs to be done prior to generated columns as they'll call
fix_fields and functions might want to access bitmaps.
*/
bitmap_size = share->column_bitmap_size;
if (!(bitmaps = root->ArrayAlloc<uchar>(bitmap_size * 7))) goto err;
bitmap_init(&outparam->def_read_set, (my_bitmap_map *)bitmaps, share->fields,
false);
bitmap_init(&outparam->def_write_set,
(my_bitmap_map *)(bitmaps + bitmap_size), share->fields, false);
bitmap_init(&outparam->tmp_set, (my_bitmap_map *)(bitmaps + bitmap_size * 2),
share->fields, false);
bitmap_init(&outparam->cond_set, (my_bitmap_map *)(bitmaps + bitmap_size * 3),
share->fields, false);
bitmap_init(&outparam->def_fields_set_during_insert,
(my_bitmap_map *)(bitmaps + bitmap_size * 4), share->fields,
false);
bitmap_init(&outparam->fields_for_functional_indexes,
(my_bitmap_map *)(bitmaps + bitmap_size * 5), share->fields,
false);
bitmap_init(&outparam->pack_row_tmp_set,
(my_bitmap_map *)(bitmaps + bitmap_size * 6), share->fields,
false);
outparam->default_column_bitmaps();
/*
Process generated columns, if any.
*/
outparam->vfield = nullptr;
if (share->vfields) {
Field **vfield_ptr = root->ArrayAlloc<Field *>(share->vfields + 1);
if (!vfield_ptr) goto err;
outparam->vfield = vfield_ptr;
for (field_ptr = outparam->field; *field_ptr; field_ptr++) {
if ((*field_ptr)->gcol_info) {
if (unpack_value_generator(thd, outparam, &(*field_ptr)->gcol_info,
VGS_GENERATED_COLUMN,
(*field_ptr)->field_name, *field_ptr,
is_create_table, &error_reported)) {
*vfield_ptr = nullptr;
error = 4; // in case no error is reported
goto err;
}
// Mark hidden generated columns for functional indexes.
if ((*field_ptr)->is_field_for_functional_index()) {
bitmap_set_bit(&outparam->fields_for_functional_indexes,
(*field_ptr)->field_index);
}
*(vfield_ptr++) = *field_ptr;
}
}
*vfield_ptr = nullptr; // End marker
}
// Check default value expressions against table's storage engine
if (share->gen_def_field_count && outparam->file &&
(!(outparam->file->ha_table_flags() & HA_SUPPORTS_DEFAULT_EXPRESSION))) {
my_error(ER_UNSUPPORTED_ACTION_ON_DEFAULT_VAL_GENERATED, MYF(0),
"Specified storage engine");
error_reported = true;
goto err;
}
// Unpack generated default fields and store reference to this type of fields
outparam->gen_def_fields_ptr = nullptr;
if (share->gen_def_field_count) {
Field **gen_def_field =
root->ArrayAlloc<Field *>(share->gen_def_field_count + 1);
if (!gen_def_field) goto err;
outparam->gen_def_fields_ptr = gen_def_field;
for (field_ptr = outparam->field; *field_ptr; field_ptr++) {
if ((*field_ptr)->has_insert_default_general_value_expression()) {
if (unpack_value_generator(
thd, outparam, &(*field_ptr)->m_default_val_expr,
VGS_DEFAULT_EXPRESSION, (*field_ptr)->field_name, *field_ptr,
is_create_table, &error_reported)) {
(*field_ptr)->m_default_val_expr = nullptr;
*gen_def_field = nullptr;
// In case no error is reported
error = 4;
goto err;
}
*(gen_def_field++) = *field_ptr;
}
}
*gen_def_field = nullptr; // End marker
}
/*
Set up table check constraints from the table share and unpack check
constraint expression.
*/
if (share->check_constraint_share_list != nullptr) {
DBUG_ASSERT(share->check_constraint_share_list->size() > 0);
outparam->table_check_constraint_list =
new (root) Sql_table_check_constraint_list(root);
if (outparam->table_check_constraint_list == nullptr) goto err; // OOM
for (auto &cc_share : *share->check_constraint_share_list) {
// Check constraint name.
LEX_CSTRING name;
if (lex_string_strmake(root, &name, cc_share->name().str,
cc_share->name().length))
goto err; // OOM
// Check constraint expression.
LEX_CSTRING expr_str;
if (lex_string_strmake(root, &expr_str, cc_share->expr_str().str,
cc_share->expr_str().length))
goto err; // OOM
/*
Value generator instance for the check constraint expression. Memory
for val_gen is allocated in the thd->mem_root here intentionally.
Parser instantiate another value generator object in TABLE's mem_root
in unpack_value_generator().
*/
Value_generator *val_gen = new (thd->mem_root) Value_generator();
val_gen->dup_expr_str(thd->mem_root, expr_str.str, expr_str.length);
Sql_table_check_constraint *table_cc =
new (root) Sql_table_check_constraint(
name, expr_str, cc_share->is_enforced(), val_gen, outparam);
if (table_cc == nullptr) goto err; // OOM
// Unpack check constraint expression.
if (unpack_value_generator(thd, outparam, &val_gen, VGS_CHECK_CONSTRAINT,
table_cc->name().str, nullptr, is_create_table,
&error_reported))
goto err;
// Use value generator obtained from the parser.
table_cc->set_value_generator(val_gen);
if (outparam->table_check_constraint_list->push_back(table_cc)) goto err;
}
}
/* The table struct is now initialized; Open the table */
error = 2;
if (db_stat) {
const dd::Table *table_def = table_def_param;
dd::cache::Dictionary_client::Auto_releaser releaser(thd->dd_client());
if (!table_def) {
if (thd->dd_client()->acquire(share->db.str, share->table_name.str,
&table_def)) {
error_reported = true;
goto err;
}
if (!table_def) {
error = 1;
set_my_errno(ENOENT);
goto err;
}
}
int ha_err;
if ((ha_err = (outparam->file->ha_open(
outparam, share->normalized_path.str,
(db_stat & HA_READ_ONLY ? O_RDONLY : O_RDWR),
((db_stat & HA_OPEN_TEMPORARY
? HA_OPEN_TMP_TABLE
: (db_stat & HA_WAIT_IF_LOCKED)
? HA_OPEN_WAIT_IF_LOCKED
: (db_stat & (HA_ABORT_IF_LOCKED | HA_GET_INFO))
? HA_OPEN_ABORT_IF_LOCKED
: HA_OPEN_IGNORE_IF_LOCKED) |
ha_open_flags),
table_def)))) {
/* Set a flag if the table is crashed and it can be auto. repaired */
share->crashed = ((ha_err == HA_ERR_CRASHED_ON_USAGE) &&
outparam->file->auto_repair() &&
!(ha_open_flags & HA_OPEN_FOR_REPAIR));
switch (ha_err) {
case HA_ERR_TABLESPACE_MISSING:
/*
In case of Innodb table space header may be corrupted or
ibd file might be missing
*/
error = 1;
DBUG_ASSERT(my_errno() == HA_ERR_TABLESPACE_MISSING);
break;
case HA_ERR_NO_SUCH_TABLE:
/*
The table did not exists in storage engine, use same error message
as if the .frm file didn't exist
*/
error = 1;
set_my_errno(ENOENT);
break;
case EMFILE:
/*
Too many files opened, use same error message as if the .frm
file can't open
*/
DBUG_PRINT("error",
("open file: %s failed, too many files opened (errno: %d)",
share->normalized_path.str, ha_err));
error = 1;
set_my_errno(EMFILE);
break;
default:
outparam->file->print_error(ha_err, MYF(0));
error_reported = true;
if (ha_err == HA_ERR_TABLE_DEF_CHANGED)
error = 7;
else if (ha_err == HA_ERR_ROW_FORMAT_CHANGED)
error = 8;
break;
}
goto err; /* purecov: inspected */
}
} else if (outparam->file) // if db_stat!=0, ha_open() set those pointers:
outparam->file->change_table_ptr(outparam, share);
if ((share->table_category == TABLE_CATEGORY_LOG) ||
(share->table_category == TABLE_CATEGORY_RPL_INFO) ||
(share->table_category == TABLE_CATEGORY_GTID)) {
outparam->no_replicate = true;
} else if (outparam->file) {
handler::Table_flags flags = outparam->file->ha_table_flags();
outparam->no_replicate =
!(flags & (HA_BINLOG_STMT_CAPABLE | HA_BINLOG_ROW_CAPABLE)) ||
(flags & HA_HAS_OWN_BINLOGGING);
} else {
outparam->no_replicate = false;
}
/* Increment the opened_tables counter, only when open flags set. */
if (db_stat) thd->status_var.opened_tables++;
return 0;
err:
if (!error_reported) open_table_error(thd, share, error, my_errno());
destroy(outparam->file);
if (outparam->part_info) free_items(outparam->part_info->item_list);
if (outparam->vfield) {
for (Field **vfield = outparam->vfield; *vfield; vfield++)
free_items((*vfield)->gcol_info->item_list);
}
if (outparam->gen_def_fields_ptr) {
for (Field **gen_def = outparam->gen_def_fields_ptr; *gen_def; gen_def++)
free_items((*gen_def)->m_default_val_expr->item_list);
}
if (outparam->table_check_constraint_list != nullptr) {
for (auto &table_cc : *outparam->table_check_constraint_list) {
free_items(table_cc->value_generator()->item_list);
}
}
outparam->file = 0; // For easier error checking
outparam->db_stat = 0;
if (!internal_tmp) free_root(root, MYF(0));
my_free(const_cast<char *>(outparam->alias));
return error;
}
/**
Free information allocated by openfrm
@param table TABLE object to free
@param free_share Is 1 if we also want to free table_share
*/
int closefrm(TABLE *table, bool free_share) {
int error = 0;
DBUG_TRACE;
DBUG_PRINT("enter", ("table: %p", table));
if (table->db_stat) error = table->file->ha_close();
my_free(const_cast<char *>(table->alias));
table->alias = 0;
if (table->field) {
for (Field **ptr = table->field; *ptr; ptr++) {
if ((*ptr)->gcol_info) free_items((*ptr)->gcol_info->item_list);
if ((*ptr)->m_default_val_expr)
free_items((*ptr)->m_default_val_expr->item_list);
destroy(*ptr);
}
table->field = 0;
}
if (table->table_check_constraint_list != nullptr) {
for (auto &table_cc : *table->table_check_constraint_list) {
free_items(table_cc->value_generator()->item_list);
}
}
destroy(table->file);
table->file = 0; /* For easier errorchecking */
if (table->part_info) {
/* Allocated through table->mem_root, freed below */
free_items(table->part_info->item_list);
table->part_info->item_list = nullptr;
table->part_info = nullptr;
}
if (free_share) {
if (table->s->tmp_table == NO_TMP_TABLE)
release_table_share(table->s);
else
free_table_share(table->s);
}
free_root(&table->mem_root, MYF(0));
return error;
}
/* Deallocate temporary blob storage */
void free_blobs(TABLE *table) {
uint *ptr, *end;
for (ptr = table->s->blob_field, end = ptr + table->s->blob_fields;
ptr != end; ptr++) {
/*
Reduced TABLE objects which are used by row-based replication for
type conversion might have some fields missing. Skip freeing BLOB
buffers for such missing fields.
*/
if (table->field[*ptr]) ((Field_blob *)table->field[*ptr])->mem_free();
}
}
/**
Reclaims temporary blob storage which is bigger than a threshold.
Resets blob pointer. Unsets m_keep_old_value.
@param table A handle to the TABLE object containing blob fields
@param size The threshold value.
*/
void free_blob_buffers_and_reset(TABLE *table, uint32 size) {
uint *ptr, *end;
for (ptr = table->s->blob_field, end = ptr + table->s->blob_fields;
ptr != end; ptr++) {
Field_blob *blob = down_cast<Field_blob *>(table->field[*ptr]);
if (blob->get_field_buffer_size() > size) blob->mem_free();
blob->reset();
if (blob->is_virtual_gcol()) blob->set_keep_old_value(false);
}
}
/* error message when opening a table defintion */
static void open_table_error(THD *thd, TABLE_SHARE *share, int error,
int db_errno) {
int err_no;
char buff[FN_REFLEN];
char errbuf[MYSYS_STRERROR_SIZE];
DBUG_TRACE;
switch (error) {
case 8:
case 7:
case 1:
switch (db_errno) {
case ENOENT:
my_error(ER_NO_SUCH_TABLE, MYF(0), share->db.str,
share->table_name.str);
break;
case HA_ERR_TABLESPACE_MISSING:
snprintf(errbuf, MYSYS_STRERROR_SIZE, "`%s`.`%s`", share->db.str,
share->table_name.str);
my_error(ER_TABLESPACE_MISSING, MYF(0), errbuf);
break;
default:
strxmov(buff, share->normalized_path.str, reg_ext, NullS);
my_error((db_errno == EMFILE) ? ER_CANT_OPEN_FILE : ER_FILE_NOT_FOUND,
MYF(0), buff, db_errno,
my_strerror(errbuf, sizeof(errbuf), db_errno));
LogErr(ERROR_LEVEL,
(db_errno == EMFILE) ? ER_SERVER_CANT_OPEN_FILE
: ER_SERVER_FILE_NOT_FOUND,
buff, db_errno, my_strerror(errbuf, sizeof(errbuf), db_errno));
}
break;
case 2: {
handler *file = 0;
const char *datext = "";
if (share->db_type() != NULL) {
if ((file = get_new_handler(share, share->m_part_info != NULL,
thd->mem_root, share->db_type()))) {
if (!file->ht->file_extensions ||
!(datext = file->ht->file_extensions[0]))
datext = "";
}
}
err_no = (db_errno == ENOENT)
? ER_FILE_NOT_FOUND
: (db_errno == EAGAIN) ? ER_FILE_USED : ER_CANT_OPEN_FILE;
strxmov(buff, share->normalized_path.str, datext, NullS);
my_error(err_no, MYF(0), buff, db_errno,
my_strerror(errbuf, sizeof(errbuf), db_errno));
LogErr(ERROR_LEVEL,
(db_errno == ENOENT)
? ER_SERVER_FILE_NOT_FOUND
: (db_errno == EAGAIN) ? ER_SERVER_FILE_USED
: ER_SERVER_CANT_OPEN_FILE,
buff, db_errno, my_strerror(errbuf, sizeof(errbuf), db_errno));
destroy(file);
break;
}
default: /* Better wrong error than none */
case 4:
strxmov(buff, share->normalized_path.str, reg_ext, NullS);
my_error(ER_NOT_FORM_FILE, MYF(0), buff);
LogErr(ERROR_LEVEL, ER_SERVER_NOT_FORM_FILE, buff);
break;
}
} /* open_table_error */
/* Check that the integer is in the internal */
int set_zone(int nr, int min_zone, int max_zone) {
if (nr <= min_zone) return (min_zone);
if (nr >= max_zone) return (max_zone);
return (nr);
} /* set_zone */
/**
Store an SQL quoted string.
@param res result String
@param pos string to be quoted
@param length it's length
NOTE
This function works correctly with utf8 or single-byte charset strings.
May fail with some multibyte charsets though.
*/
void append_unescaped(String *res, const char *pos, size_t length) {
const char *end = pos + length;
if (res->reserve(length + 2)) return;
res->append('\'');
for (; pos != end; pos++) {
switch (*pos) {
case 0: /* Must be escaped for 'mysql' */
res->append('\\');
res->append('0');
break;
case '\n': /* Must be escaped for logs */
res->append('\\');
res->append('n');
break;
case '\r':
res->append('\\'); /* This gives better readability */
res->append('r');
break;
case '\\':
res->append('\\'); /* Because of the sql syntax */
res->append('\\');
break;
case '\'':
res->append('\''); /* Because of the sql syntax */
res->append('\'');
break;
default:
res->append(*pos);
break;
}
}
res->append('\'');
}
void update_create_info_from_table(HA_CREATE_INFO *create_info, TABLE *table) {
TABLE_SHARE *share = table->s;
DBUG_TRACE;
create_info->max_rows = share->max_rows;
create_info->min_rows = share->min_rows;
create_info->table_options = share->db_create_options;
create_info->avg_row_length = share->avg_row_length;
create_info->row_type = share->row_type;
create_info->default_table_charset = share->table_charset;
create_info->table_charset = 0;
create_info->comment = share->comment;
create_info->storage_media = share->default_storage_media;
create_info->tablespace = share->tablespace;
create_info->compress = share->compress;
create_info->encrypt_type = share->encrypt_type;
create_info->secondary_engine = share->secondary_engine;
}
int rename_file_ext(const char *from, const char *to, const char *ext) {
char from_b[FN_REFLEN], to_b[FN_REFLEN];
(void)strxmov(from_b, from, ext, NullS);
(void)strxmov(to_b, to, ext, NullS);
return (mysql_file_rename(key_file_frm, from_b, to_b, MYF(MY_WME)));
}
/**
Allocate string field in MEM_ROOT and return it as String
@param mem MEM_ROOT for allocating
@param field Field for retrieving of string
@param res result String
@retval 1 string is empty
@retval 0 all ok
*/
bool get_field(MEM_ROOT *mem, Field *field, String *res) {
char buff[MAX_FIELD_WIDTH], *to;
String str(buff, sizeof(buff), &my_charset_bin);
size_t length;
field->val_str(&str);
if (!(length = str.length())) {
res->length(0);
return 1;
}
if (!(to = strmake_root(mem, str.ptr(), length))) length = 0; // Safety fix
res->set(to, length, field->charset());
return 0;
}
/**
Allocate string field in MEM_ROOT and return it as NULL-terminated string
@param mem MEM_ROOT for allocating
@param field Field for retrieving of string
@retval NullS string is empty
@retval other pointer to NULL-terminated string value of field
*/
char *get_field(MEM_ROOT *mem, Field *field) {
char buff[MAX_FIELD_WIDTH], *to;
String str(buff, sizeof(buff), &my_charset_bin);
size_t length;
field->val_str(&str);
length = str.length();
if (!length || !(to = (char *)mem->Alloc(length + 1))) return NullS;
memcpy(to, str.ptr(), length);
to[length] = 0;
return to;
}
/**
Check if database name is valid
@param name Name of database
@param length Length of name
@retval Ident_name_check::OK Identifier name is Ok (Success)
@retval Ident_name_check::WRONG Identifier name is Wrong
(ER_WRONG_TABLE_NAME)
@retval Ident_name_check::TOO_LONG Identifier name is too long if it is
greater than 64 characters
(ER_TOO_LONG_IDENT)
@note In case of Ident_name_check::WRONG and Ident_name_check::TOO_LONG, this
function reports an error (my_error)
*/
Ident_name_check check_db_name(const char *name, size_t length) {
Ident_name_check ident_check_status;
if (!length || length > NAME_LEN) {
my_error(ER_WRONG_DB_NAME, MYF(0), name);
return Ident_name_check::WRONG;
}
ident_check_status = check_table_name(name, length);
if (ident_check_status == Ident_name_check::WRONG)
my_error(ER_WRONG_DB_NAME, MYF(0), name);
else if (ident_check_status == Ident_name_check::TOO_LONG)
my_error(ER_TOO_LONG_IDENT, MYF(0), name);
return ident_check_status;
}
/**
Check if database name is valid, and convert to lower case if necessary
@param org_name Name of database and length
@param preserve_lettercase Preserve lettercase if true
@note If lower_case_table_names is true and preserve_lettercase
is false then database is converted to lower case
@retval Ident_name_check::OK Identifier name is Ok (Success)
@retval Ident_name_check::WRONG Identifier name is Wrong
(ER_WRONG_TABLE_NAME)
@retval Ident_name_check::TOO_LONG Identifier name is too long if it is
greater than 64 characters
(ER_TOO_LONG_IDENT)
@note In case of Ident_name_check::WRONG and Ident_name_check::TOO_LONG, this
function reports an error (my_error)
*/
Ident_name_check check_and_convert_db_name(LEX_STRING *org_name,
bool preserve_lettercase) {
char *name = org_name->str;
size_t name_length = org_name->length;
Ident_name_check ident_check_status;
if (!name_length || name_length > NAME_LEN) {
my_error(ER_WRONG_DB_NAME, MYF(0), org_name->str);
return Ident_name_check::WRONG;
}
if (!preserve_lettercase && lower_case_table_names && name != any_db)
my_casedn_str(files_charset_info, name);
ident_check_status = check_table_name(name, name_length);
if (ident_check_status == Ident_name_check::WRONG)
my_error(ER_WRONG_DB_NAME, MYF(0), org_name->str);
else if (ident_check_status == Ident_name_check::TOO_LONG)
my_error(ER_TOO_LONG_IDENT, MYF(0), org_name->str);
return ident_check_status;
}
/**
Function to check if table name is valid or not. If it is invalid,
return appropriate error in each case to the caller.
@param name Table name
@param length Length of table name
@retval Ident_name_check::OK Identifier name is Ok (Success)
@retval Ident_name_check::WRONG Identifier name is Wrong
(ER_WRONG_TABLE_NAME)
@retval Ident_name_check::TOO_LONG Identifier name is too long if it is
greater than 64 characters
(ER_TOO_LONG_IDENT)
@note Reporting error to the user is the responsiblity of the caller.
*/
Ident_name_check check_table_name(const char *name, size_t length) {
// name length in symbols
size_t name_length = 0;
const char *end = name + length;
if (!length || length > NAME_LEN) return Ident_name_check::WRONG;
bool last_char_is_space = false;
while (name != end) {
last_char_is_space = my_isspace(system_charset_info, *name);
if (use_mb(system_charset_info)) {
int len = my_ismbchar(system_charset_info, name, end);
if (len) {
name += len;
name_length++;
continue;
}
}
name++;
name_length++;
}
if (last_char_is_space)
return Ident_name_check::WRONG;
else if (name_length > NAME_CHAR_LEN)
return Ident_name_check::TOO_LONG;
return Ident_name_check::OK;
}
bool check_column_name(const char *name) {
// name length in symbols
size_t name_length = 0;
bool last_char_is_space = true;
while (*name) {
last_char_is_space = my_isspace(system_charset_info, *name);
if (use_mb(system_charset_info)) {
int len = my_ismbchar(system_charset_info, name,
name + system_charset_info->mbmaxlen);
if (len) {
name += len;
name_length++;
continue;
}
}
if (*name == NAMES_SEP_CHAR) return 1;
name++;
name_length++;
}
/* Error if empty or too long column name */
return last_char_is_space || (name_length > NAME_CHAR_LEN);
}
/**
Checks whether a table is intact. Should be done *just* after the table has
been opened.
@param[in] table The table to check
@param[in] table_def Expected structure of the table (column name
and type)
@retval false OK
@retval true There was an error.
*/
bool Table_check_intact::check(THD *thd MY_ATTRIBUTE((unused)), TABLE *table,
const TABLE_FIELD_DEF *table_def) {
uint i;
bool error = false;
const TABLE_FIELD_TYPE *field_def = table_def->field;
DBUG_TRACE;
DBUG_PRINT("info",
("table: %s expected_count: %d", table->alias, table_def->count));
/* Whether the table definition has already been validated. */
if (table->s->table_field_def_cache == table_def) goto end;
if (table->s->fields != table_def->count) {
DBUG_PRINT("info", ("Column count has changed, checking the definition"));
/* previous MySQL version */
if (MYSQL_VERSION_ID > table->s->mysql_version) {
report_error(ER_COL_COUNT_DOESNT_MATCH_PLEASE_UPDATE_V2,
ER_THD(thd, ER_COL_COUNT_DOESNT_MATCH_PLEASE_UPDATE_V2),
table->s->db.str, table->alias, table_def->count,
table->s->fields, static_cast<int>(table->s->mysql_version),
MYSQL_VERSION_ID);
return true;
} else if (MYSQL_VERSION_ID == table->s->mysql_version) {
report_error(ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2,
ER_THD(thd, ER_COL_COUNT_DOESNT_MATCH_CORRUPTED_V2),
table->s->db.str, table->s->table_name.str, table_def->count,
table->s->fields);
return true;
}
/*
Something has definitely changed, but we're running an older
version of MySQL with new system tables.
Let's check column definitions. If a column was added at
the end of the table, then we don't care much since such change
is backward compatible.
*/
}
char buffer[STRING_BUFFER_USUAL_SIZE];
for (i = 0; i < table_def->count; i++, field_def++) {
String sql_type(buffer, sizeof(buffer), system_charset_info);
sql_type.length(0);
if (i < table->s->fields) {
Field *field = table->field[i];
if (strncmp(field->field_name, field_def->name.str,
field_def->name.length)) {
/*
Name changes are not fatal, we use ordinal numbers to access columns.
Still this can be a sign of a tampered table, output an error
to the error log.
*/
report_error(0,
"Incorrect definition of table %s.%s: "
"expected column '%s' at position %d, found '%s'.",
table->s->db.str, table->alias, field_def->name.str, i,
field->field_name);
}
field->sql_type(sql_type);
/*
Generally, if column types don't match, then something is
wrong.
However, we only compare column definitions up to the
length of the original definition, since we consider the
following definitions compatible:
1. DATETIME and DATETIM
2. INT(11) and INT(11
3. SET('one', 'two') and SET('one', 'two', 'more')
For SETs or ENUMs, if the same prefix is there it's OK to
add more elements - they will get higher ordinal numbers and
the new table definition is backward compatible with the
original one.
*/
if (strncmp(sql_type.c_ptr_safe(), field_def->type.str,
field_def->type.length - 1)) {
report_error(ER_CANNOT_LOAD_FROM_TABLE_V2,
"Incorrect definition of "
"table %s.%s: expected column '%s' at position %d to "
"have type %s, found type %s.",
table->s->db.str, table->alias, field_def->name.str, i,
field_def->type.str, sql_type.c_ptr_safe());
error = true;
} else if (field_def->cset.str && !field->has_charset()) {
report_error(ER_CANNOT_LOAD_FROM_TABLE_V2,
"Incorrect definition of "
"table %s.%s: expected the type of column '%s' at "
"position %d to have character set '%s' but the type "
"has no character set.",
table->s->db.str, table->alias, field_def->name.str, i,
field_def->cset.str);
error = true;
} else if (field_def->cset.str &&
strcmp(field->charset()->csname, field_def->cset.str)) {
report_error(ER_CANNOT_LOAD_FROM_TABLE_V2,
"Incorrect definition of "
"table %s.%s: expected the type of column '%s' at "
"position %d to have character set '%s' but found "
"character set '%s'.",
table->s->db.str, table->alias, field_def->name.str, i,
field_def->cset.str, field->charset()->csname);
error = true;
}
} else {
report_error(ER_CANNOT_LOAD_FROM_TABLE_V2,
"Incorrect definition of "
"table %s.%s: expected column '%s' at position %d to "
"have type %s but the column is not found.",
table->s->db.str, table->alias, field_def->name.str, i,
field_def->type.str);
error = true;
}
}
if (!error) table->s->table_field_def_cache = table_def;
end:
if (has_keys && !error && !table->key_info) {
my_error(ER_MISSING_KEY, MYF(0), table->s->db.str,
table->s->table_name.str);
error = true;
}
return error;
}
/**
Traverse portion of wait-for graph which is reachable through edge
represented by this flush ticket in search for deadlocks.
@retval true A deadlock is found. A victim is remembered
by the visitor.
@retval false Success, no deadlocks.
*/
bool Wait_for_flush::accept_visitor(MDL_wait_for_graph_visitor *gvisitor) {
return m_share->visit_subgraph(this, gvisitor);
}
uint Wait_for_flush::get_deadlock_weight() const { return m_deadlock_weight; }
/**
Traverse portion of wait-for graph which is reachable through this
table share in search for deadlocks.
@param wait_for_flush Undocumented.
@param gvisitor Deadlock detection visitor.
@retval true A deadlock is found. A victim is remembered
by the visitor.
@retval false No deadlocks, it's OK to begin wait.
*/
bool TABLE_SHARE::visit_subgraph(Wait_for_flush *wait_for_flush,
MDL_wait_for_graph_visitor *gvisitor) {
TABLE *table;
MDL_context *src_ctx = wait_for_flush->get_ctx();
bool result = true;
bool locked = false;
/*
To protect used_tables list from being concurrently modified
while we are iterating through it we acquire LOCK_open.
This does not introduce deadlocks in the deadlock detector
because we won't try to acquire LOCK_open while
holding a write-lock on MDL_lock::m_rwlock.
*/
if (gvisitor->m_lock_open_count++ == 0) {
locked = true;
table_cache_manager.lock_all_and_tdc();
}
Table_cache_iterator tables_it(this);
/*
In case of multiple searches running in parallel, avoid going
over the same loop twice and shortcut the search.
Do it after taking the lock to weed out unnecessary races.
*/
if (src_ctx->m_wait.get_status() != MDL_wait::WS_EMPTY) {
result = false;
goto end;
}
if (gvisitor->enter_node(src_ctx)) goto end;
while ((table = tables_it++)) {
if (gvisitor->inspect_edge(&table->in_use->mdl_context)) {
goto end_leave_node;
}
}
tables_it.rewind();
while ((table = tables_it++)) {
if (table->in_use->mdl_context.visit_subgraph(gvisitor)) {
goto end_leave_node;
}
}
result = false;
end_leave_node:
gvisitor->leave_node(src_ctx);
end:
gvisitor->m_lock_open_count--;
if (locked) {
DBUG_ASSERT(gvisitor->m_lock_open_count == 0);
table_cache_manager.unlock_all_and_tdc();
}
return result;
}
const histograms::Histogram *TABLE_SHARE::find_histogram(uint field_index) {
if (m_histograms == nullptr) return nullptr;
const auto found = m_histograms->find(field_index);
if (found == m_histograms->end()) return nullptr;
return found->second;
}
/**
Wait until the subject share is removed from the table
definition cache and make sure it's destroyed.
@note This method may access the share concurrently with another
thread if the share is in the process of being opened, i.e., that
m_open_in_progress is true. In this case, close_cached_tables() may
iterate over elements in the table definition cache, and call this
method regardless of the share being opened or not. This works anyway
since a new flush ticket is added below, and LOCK_open ensures
that the share may not be destroyed by another thread in the time
between finding this share (having an old version) and adding the flush
ticket. Thus, after this thread has added the flush ticket, the thread
opening the table will eventually call free_table_share (as a result of
releasing the share after using it, or as a result of a failing
open_table_def()), which will notify the owners of the flush tickets,
and the last one being notified will actually destroy the share.
@param thd Session.
@param abstime Timeout for waiting as absolute time value.
@param deadlock_weight Weight of this wait for deadlock detector.
@pre LOCK_open is write locked, the share is used (has
non-zero reference count), is marked for flush and
this connection does not reference the share.
LOCK_open will be unlocked temporarily during execution.
@retval false - Success.
@retval true - Error (OOM, deadlock, timeout, etc...).
*/
bool TABLE_SHARE::wait_for_old_version(THD *thd, struct timespec *abstime,
uint deadlock_weight) {
MDL_context *mdl_context = &thd->mdl_context;
Wait_for_flush ticket(mdl_context, this, deadlock_weight);
MDL_wait::enum_wait_status wait_status;
mysql_mutex_assert_owner(&LOCK_open);
/*
We should enter this method only when share's version is not
up to date and the share is referenced. Otherwise our
thread will never be woken up from wait.
*/
DBUG_ASSERT(has_old_version() && ref_count() != 0);
m_flush_tickets.push_front(&ticket);
mdl_context->m_wait.reset_status();
mysql_mutex_unlock(&LOCK_open);
mdl_context->will_wait_for(&ticket);
mdl_context->find_deadlock();
DEBUG_SYNC(thd, "flush_complete");
wait_status = mdl_context->m_wait.timed_wait(thd, abstime, true,
&stage_waiting_for_table_flush);
mdl_context->done_waiting_for();
mysql_mutex_lock(&LOCK_open);
m_flush_tickets.remove(&ticket);
if (m_flush_tickets.is_empty() && ref_count() == 0) {
/*
If our thread was the last one using the share,
we must destroy it here.
*/
destroy();
}
DEBUG_SYNC(thd, "share_destroyed");
/*
In cases when our wait was aborted by KILL statement,
a deadlock or a timeout, the share might still be referenced,
so we don't delete it. Note, that we can't determine this
condition by checking wait_status alone, since, for example,
a timeout can happen after all references to the table share
were released, but before the share is removed from the
cache and we receive the notification. This is why
we first destroy the share, and then look at
wait_status.
*/
switch (wait_status) {
case MDL_wait::GRANTED:
return false;
case MDL_wait::VICTIM:
my_error(ER_LOCK_DEADLOCK, MYF(0));
return true;
case MDL_wait::TIMEOUT:
my_error(ER_LOCK_WAIT_TIMEOUT, MYF(0));
return true;
case MDL_wait::KILLED:
return true;
default:
DBUG_ASSERT(0);
return true;
}
}
ulonglong TABLE_SHARE::get_table_ref_version() const {
if (table_category == TABLE_CATEGORY_DICTIONARY ||
tmp_table == SYSTEM_TMP_TABLE ||
(is_view && view_object &&
view_object->type() == dd::enum_table_type::SYSTEM_VIEW))
return 0;
return table_map_id.id();
}
Blob_mem_storage::Blob_mem_storage() : truncated_value(false) {
init_alloc_root(key_memory_blob_mem_storage, &storage,
MAX_FIELD_VARCHARLENGTH, 0);
}
Blob_mem_storage::~Blob_mem_storage() { free_root(&storage, MYF(0)); }
/**
Initialize TABLE instance (newly created, or coming either from table
cache or THD::temporary_tables list) and prepare it for further use
during statement execution. Set the 'alias' attribute from the specified
TABLE_LIST element. Remember the TABLE_LIST element in the
TABLE::pos_in_table_list member.
@param thd Thread context.
@param tl TABLE_LIST element.
*/
void TABLE::init(THD *thd, TABLE_LIST *tl) {
#ifndef DBUG_OFF
if (s->tmp_table == NO_TMP_TABLE) {
mysql_mutex_lock(&LOCK_open);
DBUG_ASSERT(s->ref_count() > 0);
mysql_mutex_unlock(&LOCK_open);
}
#endif
if (thd->lex->need_correct_ident())
alias_name_used =
my_strcasecmp(table_alias_charset, s->table_name.str, tl->alias);
/* Fix alias if table name changes. */
if (strcmp(alias, tl->alias)) {
size_t length = strlen(tl->alias) + 1;
alias = static_cast<char *>(my_realloc(
key_memory_TABLE, const_cast<char *>(alias), length, MYF(MY_WME)));
memcpy(const_cast<char *>(alias), tl->alias, length);
}
const_table = false;
nullable = false;
force_index = 0;
force_index_order = 0;
force_index_group = 0;
set_not_started();
insert_values = 0;
fulltext_searched = 0;
file->ft_handler = 0;
reginfo.impossible_range = 0;
/* Catch wrong handling of the autoinc_field_has_explicit_non_null_value. */
DBUG_ASSERT(!autoinc_field_has_explicit_non_null_value);
autoinc_field_has_explicit_non_null_value = false;
pos_in_table_list = tl;
clear_column_bitmaps();
DBUG_ASSERT(key_read == 0);
no_keyread = false;
/* Tables may be reused in a sub statement. */
DBUG_ASSERT(!db_stat || !file->ha_extra(HA_EXTRA_IS_ATTACHED_CHILDREN));
/*
Do not call refix_value_generator_items() for tables which are not directly
used by the statement (i.e. used by the substatements of routines or
triggers to be invoked by the statement).
Firstly, there will be call to refix_value_generator_items() at the start
of execution of substatement which directly uses this table anyway.
Secondly, cleanup of generated column (call to
cleanup_value_generator_items()) for the table will be done only at the
end of execution of substatement which uses it. Because of this call to
refix_value_generator_items() for prelocking
placeholder will miss corresponding call to cleanup_value_generator_items()
if substatement which uses the table is not executed for some reason.
*/
if (!pos_in_table_list->prelocking_placeholder) {
bool error MY_ATTRIBUTE((unused)) = refix_value_generator_items(thd);
DBUG_ASSERT(!error);
}
}
/**
Initialize table as internal tmp table
@param thd thread handle
@param share table share
@param m_root table's mem root
@param charset table's charset
@param alias_arg table's alias
@param fld table's fields array
@param blob_fld buffer for blob field index
@param is_virtual true <=> it's a virtual tmp table
@returns
true OOM
false otherwise
*/
bool TABLE::init_tmp_table(THD *thd, TABLE_SHARE *share, MEM_ROOT *m_root,
CHARSET_INFO *charset, const char *alias_arg,
Field **fld, uint *blob_fld, bool is_virtual) {
if (!is_virtual) {
char *name, path[FN_REFLEN];
DBUG_ASSERT(sizeof(my_thread_id) == 4);
sprintf(path, "%s%lx_%x_%x", tmp_file_prefix, current_pid, thd->thread_id(),
thd->tmp_table++);
fn_format(path, path, mysql_tmpdir, "",
MY_REPLACE_EXT | MY_UNPACK_FILENAME);
if (!(name = (char *)m_root->Alloc(strlen(path) + 1))) return true;
my_stpcpy(name, path);
init_tmp_table_share(thd, share, "", 0, name, name, m_root);
}
s = share;
in_use = thd;
share->blob_field = blob_fld;
share->db_low_byte_first = 1; // True for HEAP and MyISAM
share->increment_ref_count();
share->primary_key = MAX_KEY;
share->visible_indexes.init();
share->keys_for_keyread.init();
share->keys_in_use.init();
share->keys = 0;
share->field = field = fld;
share->table_charset = charset;
set_not_started();
alias = alias_arg;
reginfo.lock_type = TL_WRITE; /* Will be updated */
db_stat = HA_OPEN_KEYFILE + HA_OPEN_RNDFILE;
copy_blobs = 1;
quick_keys.init();
possible_quick_keys.init();
covering_keys.init();
merge_keys.init();
keys_in_use_for_query.init();
keys_in_use_for_group_by.init();
keys_in_use_for_order_by.init();
set_not_started();
#ifndef DBUG_OFF
set_tmp_table_seq_id(thd->get_tmp_table_seq_id());
#endif
return false;
}
bool TABLE::refix_value_generator_items(THD *thd) {
if (vfield) {
for (Field **vfield_ptr = vfield; *vfield_ptr; vfield_ptr++) {
Field *vfield = *vfield_ptr;
DBUG_ASSERT(vfield->gcol_info && vfield->gcol_info->expr_item);
refix_inner_value_generator_items(thd, vfield->gcol_info, vfield,
vfield->table, VGS_GENERATED_COLUMN,
vfield->field_name);
}
}
if (gen_def_fields_ptr)
for (Field **gen_def_col = gen_def_fields_ptr; *gen_def_col;
gen_def_col++) {
Value_generator *gen_def_expr = (*gen_def_col)->m_default_val_expr;
DBUG_ASSERT(gen_def_expr && gen_def_expr->expr_item);
refix_inner_value_generator_items(
thd, gen_def_expr, (*gen_def_col), (*gen_def_col)->table,
VGS_DEFAULT_EXPRESSION, (*gen_def_col)->field_name);
}
if (table_check_constraint_list != nullptr) {
for (auto &table_cc : *table_check_constraint_list) {
Value_generator *cc_expr = table_cc->value_generator();
DBUG_ASSERT(cc_expr != nullptr && cc_expr->expr_item != nullptr);
refix_inner_value_generator_items(thd, cc_expr, nullptr,
table_cc->table(), VGS_CHECK_CONSTRAINT,
table_cc->name().str);
}
}
return false;
}
bool TABLE::refix_inner_value_generator_items(THD *thd, Value_generator *g_expr,
Field *field, TABLE *table,
Value_generator_source source,
const char *source_name) {
if (!g_expr->expr_item->fixed) {
bool res = false;
/*
The call to fix_value_generators_fields() may create new item objects in
the item tree for the val generation expression. If these are permanent
changes to the item tree, the new items must have the same life-span
as the ones created during parsing of the generated expression
string. We achieve this by temporarily switching to use the TABLE's
mem_root if the permanent changes to the item tree haven't been
completed (by checking the status of
gcol_info->permanent_changes_completed) and this call is not part of
context analysis (like prepare or show create table).
*/
Query_arena *backup_stmt_arena_ptr = thd->stmt_arena;
Query_arena backup_arena;
Query_arena gcol_arena(&mem_root, Query_arena::STMT_REGULAR_EXECUTION);
if (!g_expr->permanent_changes_completed &&
!thd->lex->is_ps_or_view_context_analysis()) {
thd->swap_query_arena(gcol_arena, &backup_arena);
thd->stmt_arena = &gcol_arena;
}
/*
Temporarily disable privileges check; already done when first fixed,
and then based on definer's (owner's) rights: this thread has
invoker's rights
*/
ulong sav_want_priv = thd->want_privilege;
thd->want_privilege = 0;
if (fix_value_generators_fields(thd, table, g_expr, source, source_name,
field))
res = true;
if (!g_expr->permanent_changes_completed &&
!thd->lex->is_ps_or_view_context_analysis()) {
// Switch back to the original stmt_arena.
thd->stmt_arena = backup_stmt_arena_ptr;
thd->swap_query_arena(backup_arena, &gcol_arena);
// Append the new items to the original item_free_list.
Item *item = g_expr->item_list;
while (item->next_free) item = item->next_free;
item->next_free = gcol_arena.item_list();
// Permanent changes to the item_tree are completed.
g_expr->permanent_changes_completed = true;
}
// Restore any privileges check
thd->want_privilege = sav_want_priv;
get_fields_in_item_tree = false;
/* error occurs */
if (res) return res;
}
return false;
}
void TABLE::cleanup_value_generator_items() {
if (gen_def_fields_ptr)
for (Field **vfield_ptr = gen_def_fields_ptr; *vfield_ptr; vfield_ptr++)
cleanup_items((*vfield_ptr)->m_default_val_expr->item_list);
if (table_check_constraint_list != nullptr) {
for (auto &table_cc : *table_check_constraint_list)
cleanup_items(table_cc->value_generator()->item_list);
}
if (!has_gcol()) return;
for (Field **vfield_ptr = vfield; *vfield_ptr; vfield_ptr++)
cleanup_items((*vfield_ptr)->gcol_info->item_list);
}
/**
Create Item_field for each column in the table.
SYNPOSIS
TABLE::fill_item_list()
item_list a pointer to an empty list used to store items
Create Item_field object for each column in the table and
initialize it with the corresponding Field. New items are
created in the current THD memory root.
@retval 0 success
@retval 1 out of memory
*/
bool TABLE::fill_item_list(List<Item> *item_list) const {
/*
All Item_field's created using a direct pointer to a field
are fixed in Item_field constructor.
*/
uint i = 0;
for (Field **ptr = visible_field_ptr(); *ptr; ptr++, i++) {
Item_field *item = new Item_field(*ptr);
if (!item || item_list->push_back(item)) return true;
}
return false;
}
/**
Reset an existing list of Item_field items to point to the
Fields of this table.
SYNPOSIS
TABLE::reset_item_list()
item_list a non-empty list with Item_fields
This is a counterpart of fill_item_list used to redirect
Item_fields to the fields of a newly created table.
*/
void TABLE::reset_item_list(List<Item> *item_list) const {
List_iterator_fast<Item> it(*item_list);
uint i = 0;
for (Field **ptr = visible_field_ptr(); *ptr; ptr++, i++) {
Item_field *item_field = (Item_field *)it++;
DBUG_ASSERT(item_field != 0);
item_field->reset_field(*ptr);
}
}
/**
Create a TABLE_LIST object representing a nested join
@param allocator Mem root allocator that object is created from.
@param alias Name of nested join object
@param embedding Pointer to embedding join nest (or NULL if top-most)
@param belongs_to List of tables this nest belongs to (never NULL).
@param select The query block that this join nest belongs within.
@returns Pointer to created join nest object, or NULL if error.
*/
TABLE_LIST *TABLE_LIST::new_nested_join(MEM_ROOT *allocator, const char *alias,
TABLE_LIST *embedding,
List<TABLE_LIST> *belongs_to,
SELECT_LEX *select) {
DBUG_ASSERT(belongs_to && select);
TABLE_LIST *const join_nest = new (allocator) TABLE_LIST;
if (join_nest == nullptr) return nullptr;
join_nest->nested_join = new (allocator) NESTED_JOIN;
if (join_nest->nested_join == nullptr) return nullptr;
join_nest->db = "";
join_nest->db_length = 0;
join_nest->table_name = "";
join_nest->table_name_length = 0;
join_nest->alias = alias;
join_nest->embedding = embedding;
join_nest->join_list = belongs_to;
join_nest->select_lex = select;
join_nest->nested_join->first_nested = NO_PLAN_IDX;
join_nest->nested_join->join_list.empty();
return join_nest;
}
/**
Merge tables from a query block into a nested join structure.
@param select Query block containing tables to be merged into nested join
@return false if success, true if error
*/
bool TABLE_LIST::merge_underlying_tables(SELECT_LEX *select) {
DBUG_ASSERT(nested_join->join_list.is_empty());
List_iterator_fast<TABLE_LIST> li(select->top_join_list);
TABLE_LIST *tl;
while ((tl = li++)) {
tl->embedding = this;
tl->join_list = &nested_join->join_list;
if (nested_join->join_list.push_back(tl))
return true; /* purecov: inspected */
}
return false;
}
/**
Reset a table before starting optimization
*/
void TABLE_LIST::reset() {
// @todo If TABLE::init() was always called, this would not be necessary:
table->const_table = false;
table->set_not_started();
table->force_index = force_index;
table->force_index_order = table->force_index_group = 0;
table->covering_keys = table->s->keys_for_keyread;
table->merge_keys.clear_all();
table->quick_keys.clear_all();
table->possible_quick_keys.clear_all();
table->set_keyread(false);
table->reginfo.not_exists_optimize = false;
table->m_record_buffer = Record_buffer{0, 0, nullptr};
memset(table->const_key_parts, 0, sizeof(key_part_map) * table->s->keys);
}
/**
Merge WHERE condition of view or derived table into outer query.
If the derived table is on the inner side of an outer join, its WHERE
condition is merged into the respective join operation's join condition,
otherwise the WHERE condition is merged with the derived table's
join condition.
@param thd thread handler
@return false if success, true if error
*/
bool TABLE_LIST::merge_where(THD *thd) {
DBUG_TRACE;
DBUG_ASSERT(is_merged());
Item *const condition = derived_unit()->first_select()->where_cond();
if (!condition) return false;
/*
Save the WHERE condition separately. This is needed because it is already
resolved, so we need to explicitly update used tables information after
merging this derived table into the outer query.
*/
derived_where_cond = condition;
Prepared_stmt_arena_holder ps_arena_holder(thd);
/*
Merge WHERE condition with the join condition of the outer join nest
and attach it to join nest representing this derived table.
*/
set_join_cond(and_conds(join_cond(), condition));
if (!join_cond()) return true; /* purecov: inspected */
return false;
}
/**
Create field translation for merged derived table/view.
@param thd Thread handle
@return false if success, true if error.
*/
bool TABLE_LIST::create_field_translation(THD *thd) {
Item *item;
SELECT_LEX *select = derived->first_select();
List_iterator_fast<Item> it(select->item_list);
uint field_count = 0;
DBUG_ASSERT(derived->is_prepared());
DBUG_ASSERT(!field_translation);
Prepared_stmt_arena_holder ps_arena_holder(thd);
// Create view fields translation table
Field_translator *transl = (Field_translator *)thd->stmt_arena->alloc(
select->item_list.elements * sizeof(Field_translator));
if (!transl) return true; /* purecov: inspected */
while ((item = it++)) {
/*
Notice that all items keep their nullability here.
All items are later wrapped within Item_direct_view objects.
If the view is used on the inner side of an outer join, these
objects will reflect the correct nullability of the selected
expressions.
The name is either explicitely specified in a list of column
names, or is derived from the name of the expression in the SELECT
list.
*/
transl[field_count].name = m_derived_column_names
? (*m_derived_column_names)[field_count].str
: item->item_name.ptr();
transl[field_count++].item = item;
}
field_translation = transl;
field_translation_end = transl + field_count;
return false;
}
/**
Return merged WHERE clause and join conditions for a view
@param thd thread handle
@param table table for the VIEW
@param[out] pcond Pointer to the built condition (NULL if none)
This function returns the result of ANDing the WHERE clause and the
join conditions of the given view.
@returns false for success, true for error
*/
static bool merge_join_conditions(THD *thd, TABLE_LIST *table, Item **pcond) {
DBUG_TRACE;
*pcond = NULL;
DBUG_PRINT("info", ("alias: %s", table->alias));
if (table->join_cond()) {
if (!(*pcond = table->join_cond()->copy_andor_structure(thd)))
return true; /* purecov: inspected */
}
if (!table->nested_join) return false;
List_iterator<TABLE_LIST> li(table->nested_join->join_list);
while (TABLE_LIST *tbl = li++) {
if (tbl->is_view()) continue;
Item *cond;
if (merge_join_conditions(thd, tbl, &cond))
return true; /* purecov: inspected */
if (cond && !(*pcond = and_conds(*pcond, cond)))
return true; /* purecov: inspected */
}
return false;
}
/**
Prepare check option expression of table
@param thd thread handler
@param is_cascaded True if parent view requests that this view's
filtering condition be treated as WITH CASCADED CHECK OPTION; this is for
recursive calls; user code should omit this argument.
@details
This function builds check option condition for use in regular execution or
subsequent SP/PS executions.
This function must be called after the WHERE clause and join condition
of this and all underlying derived tables/views have been resolved.
The function will always call itself recursively for all underlying views
and base tables.
On first invocation, the check option condition is built bottom-up in
statement mem_root, and check_option_processed is set true.
On subsequent executions, check_option_processed is true and no
expression building is necessary. However, the function needs to assure that
the expression is resolved by calling fix_fields() on it.
@returns false if success, true if error
*/
bool TABLE_LIST::prepare_check_option(THD *thd, bool is_cascaded) {
DBUG_TRACE;
DBUG_ASSERT(is_view());
/*
True if conditions of underlying views should be treated as WITH CASCADED
CHECK OPTION
*/
is_cascaded |= (with_check == VIEW_CHECK_CASCADED);
for (TABLE_LIST *tbl = merge_underlying_list; tbl; tbl = tbl->next_local) {
if (tbl->is_view() && tbl->prepare_check_option(thd, is_cascaded))
return true; /* purecov: inspected */
}
if (!check_option_processed) {
Prepared_stmt_arena_holder ps_arena_holder(thd);
if ((with_check || is_cascaded) &&
merge_join_conditions(thd, this, &check_option))
return true; /* purecov: inspected */
for (TABLE_LIST *tbl = merge_underlying_list; tbl; tbl = tbl->next_local) {
if (tbl->check_option &&
!(check_option = and_conds(check_option, tbl->check_option)))
return true; /* purecov: inspected */
}
check_option_processed = true;
}
if (check_option && !check_option->fixed) {
const char *save_where = thd->where;
thd->where = "check option";
if (check_option->fix_fields(thd, &check_option) ||
check_option->check_cols(1))
return true; /* purecov: inspected */
thd->where = save_where;
}
return false;
}
/**
Prepare replace filter for a table that is inserted into via a view.
Used with REPLACE command to filter out rows that should not be deleted.
Concatenate WHERE clauses from multiple views into one permanent field:
TABLE::replace_filter.
Since REPLACE is not possible against a join view, there is no need to
process join conditions, only WHERE clause is needed. But we still call
merge_join_conditions() since this is a general function that handles both
join conditions (if any) and the original WHERE clause.
@param thd thread handler
@returns false if success, true if error
*/
bool TABLE_LIST::prepare_replace_filter(THD *thd) {
DBUG_TRACE;
for (TABLE_LIST *tbl = merge_underlying_list; tbl; tbl = tbl->next_local) {
if (tbl->is_view() && tbl->prepare_replace_filter(thd)) return true;
}
if (!replace_filter_processed) {
Prepared_stmt_arena_holder ps_arena_holder(thd);
if (merge_join_conditions(thd, this, &replace_filter))
return true; /* purecov: inspected */
for (TABLE_LIST *tbl = merge_underlying_list; tbl; tbl = tbl->next_local) {
if (tbl->replace_filter) {
if (!(replace_filter = and_conds(replace_filter, tbl->replace_filter)))
return true;
}
}
replace_filter_processed = true;
}
if (replace_filter && !replace_filter->fixed) {
const char *save_where = thd->where;
thd->where = "replace filter";
if (replace_filter->fix_fields(thd, &replace_filter) ||
replace_filter->check_cols(1))
return true;
thd->where = save_where;
}
return false;
}
/**
Cleanup items belonged to view fields translation table
*/
void TABLE_LIST::cleanup_items() {
if (!field_translation) return;
for (Field_translator *transl = field_translation;
transl < field_translation_end; transl++)
transl->item->walk(&Item::cleanup_processor, enum_walk::POSTFIX, NULL);
}
/**
Check CHECK OPTION condition
@param thd thread handler
@retval VIEW_CHECK_OK OK
@retval VIEW_CHECK_ERROR FAILED
@retval VIEW_CHECK_SKIP FAILED, but continue
*/
int TABLE_LIST::view_check_option(THD *thd) const {
if (check_option && check_option->val_int() == 0) {
const TABLE_LIST *main_view = top_table();
my_error(ER_VIEW_CHECK_FAILED, MYF(0), main_view->view_db.str,
main_view->view_name.str);
if (thd->lex->is_ignore()) return (VIEW_CHECK_SKIP);
return (VIEW_CHECK_ERROR);
}
return (VIEW_CHECK_OK);
}
/**
Find table in underlying tables by map and check that only this
table belong to given map.
@param[out] table_ref reference to found table
(must be set to NULL by caller)
@param map bit mask of tables
@retval false table not found or found only one (table_ref is non-NULL)
@retval true found several tables
*/
bool TABLE_LIST::check_single_table(TABLE_LIST **table_ref, table_map map) {
for (TABLE_LIST *tbl = merge_underlying_list; tbl; tbl = tbl->next_local) {
if (tbl->is_view_or_derived() && tbl->is_merged()) {
if (tbl->check_single_table(table_ref, map)) return true;
} else if (tbl->map() & map) {
if (*table_ref) return true;
*table_ref = tbl;
}
}
return false;
}
/**
Set insert_values buffer
@param mem_root memory pool for allocating
@returns false if success, true if error (out of memory)
*/
bool TABLE_LIST::set_insert_values(MEM_ROOT *mem_root) {
if (table) {
DBUG_ASSERT(table->insert_values == NULL);
if (!table->insert_values &&
!(table->insert_values =
(uchar *)mem_root->Alloc(table->s->rec_buff_length)))
return true; /* purecov: inspected */
} else {
DBUG_ASSERT(view && merge_underlying_list);
for (TABLE_LIST *tbl = merge_underlying_list; tbl; tbl = tbl->next_local)
if (tbl->set_insert_values(mem_root))
return true; /* purecov: inspected */
}
return false;
}
/**
Test if this is a leaf with respect to name resolution.
A table reference is a leaf with respect to name resolution if
it is either a leaf node in a nested join tree (table, view,
schema table, subquery), or an inner node that represents a
NATURAL/USING join, or a nested join with materialized join
columns.
@retval true if a leaf, false otherwise.
*/
bool TABLE_LIST::is_leaf_for_name_resolution() const {
return (is_view_or_derived() || is_natural_join || is_join_columns_complete ||
!nested_join);
}
/**
Retrieve the first (left-most) leaf in a nested join tree with
respect to name resolution.
Given that 'this' is a nested table reference, recursively walk
down the left-most children of 'this' until we reach a leaf
table reference with respect to name resolution.
The left-most child of a nested table reference is the last element
in the list of children because the children are inserted in
reverse order.
@retval If 'this' is a nested table reference - the left-most child of
@retval the tree rooted in 'this',
else return 'this'
*/
TABLE_LIST *TABLE_LIST::first_leaf_for_name_resolution() {
TABLE_LIST *cur_table_ref = NULL;
NESTED_JOIN *cur_nested_join;
if (is_leaf_for_name_resolution()) return this;
DBUG_ASSERT(nested_join);
for (cur_nested_join = nested_join; cur_nested_join;
cur_nested_join = cur_table_ref->nested_join) {
List_iterator_fast<TABLE_LIST> it(cur_nested_join->join_list);
cur_table_ref = it++;
/*
If the current nested join is a RIGHT JOIN, the operands in
'join_list' are in reverse order, thus the first operand is
already at the front of the list. Otherwise the first operand
is in the end of the list of join operands.
*/
if (!(cur_table_ref->outer_join & JOIN_TYPE_RIGHT)) {
TABLE_LIST *next;
while ((next = it++)) cur_table_ref = next;
}
if (cur_table_ref->is_leaf_for_name_resolution()) break;
}
return cur_table_ref;
}
/**
Retrieve the last (right-most) leaf in a nested join tree with
respect to name resolution.
Given that 'this' is a nested table reference, recursively walk
down the right-most children of 'this' until we reach a leaf
table reference with respect to name resolution.
The right-most child of a nested table reference is the first
element in the list of children because the children are inserted
in reverse order.
@retval - If 'this' is a nested table reference - the right-most child of
@retval the tree rooted in 'this',
@retval - else - 'this'
*/
TABLE_LIST *TABLE_LIST::last_leaf_for_name_resolution() {
TABLE_LIST *cur_table_ref = this;
NESTED_JOIN *cur_nested_join;
if (is_leaf_for_name_resolution()) return this;
DBUG_ASSERT(nested_join);
for (cur_nested_join = nested_join; cur_nested_join;
cur_nested_join = cur_table_ref->nested_join) {
cur_table_ref = cur_nested_join->join_list.head();
/*
If the current nested is a RIGHT JOIN, the operands in
'join_list' are in reverse order, thus the last operand is in the
end of the list.
*/
if ((cur_table_ref->outer_join & JOIN_TYPE_RIGHT)) {
List_iterator_fast<TABLE_LIST> it(cur_nested_join->join_list);
TABLE_LIST *next;
cur_table_ref = it++;
while ((next = it++)) cur_table_ref = next;
}
if (cur_table_ref->is_leaf_for_name_resolution()) break;
}
return cur_table_ref;
}
/**
Load security context information for this view
@param thd thread handler
@retval false OK
@retval true Error
*/
bool TABLE_LIST::prepare_view_security_context(THD *thd) {
DBUG_TRACE;
DBUG_PRINT("enter", ("table: %s", alias));
DBUG_ASSERT(!prelocking_placeholder && view);
if (view_suid) {
DBUG_PRINT("info", ("This table is suid view => load contest"));
DBUG_ASSERT(view && view_sctx);
if (acl_getroot(thd, view_sctx, definer.user.str, definer.host.str,
definer.host.str, thd->db().str)) {
if ((thd->lex->sql_command == SQLCOM_SHOW_CREATE) ||
(thd->lex->sql_command == SQLCOM_SHOW_FIELDS)) {
push_warning_printf(thd, Sql_condition::SL_NOTE, ER_NO_SUCH_USER,
ER_THD(thd, ER_NO_SUCH_USER), definer.user.str,
definer.host.str);
} else {
if (thd->security_context()->check_access(SUPER_ACL)) {
my_error(ER_NO_SUCH_USER, MYF(0), definer.user.str, definer.host.str);
} else {
if (thd->password == 2)
my_error(ER_ACCESS_DENIED_NO_PASSWORD_ERROR, MYF(0),
thd->security_context()->priv_user().str,
thd->security_context()->priv_host().str);
else
my_error(
ER_ACCESS_DENIED_ERROR, MYF(0),
thd->security_context()->priv_user().str,
thd->security_context()->priv_host().str,
(thd->password ? ER_THD(thd, ER_YES) : ER_THD(thd, ER_NO)));
}
return true;
}
}
}
return false;
}
/**
Find security context of current view
@param thd thread handler
*/
Security_context *TABLE_LIST::find_view_security_context(THD *thd) {
Security_context *sctx;
TABLE_LIST *upper_view = this;
DBUG_TRACE;
DBUG_ASSERT(view);
while (upper_view && !upper_view->view_suid) {
DBUG_ASSERT(!upper_view->prelocking_placeholder);
upper_view = upper_view->referencing_view;
}
if (upper_view) {
DBUG_PRINT("info",
("Security context of view %s will be used", upper_view->alias));
sctx = upper_view->view_sctx;
DBUG_ASSERT(sctx);
} else {
DBUG_PRINT("info", ("Current global context will be used"));
sctx = thd->security_context();
}
return sctx;
}
/**
Prepare security context and load underlying tables priveleges for view
@param thd thread handler
@retval false OK
@retval true Error
*/
bool TABLE_LIST::prepare_security(THD *thd) {
List_iterator_fast<TABLE_LIST> tb(*view_tables);
TABLE_LIST *tbl;
DBUG_TRACE;
Security_context *save_security_ctx = thd->security_context();
DBUG_ASSERT(!prelocking_placeholder);
if (prepare_view_security_context(thd)) return true;
/* Acl_map was previously checked out by get_aclroot */
thd->set_security_context(find_view_security_context(thd));
opt_trace_disable_if_no_security_context_access(thd);
while ((tbl = tb++)) {
DBUG_ASSERT(tbl->referencing_view);
const char *local_db, *local_table_name;
if (tbl->is_view()) {
local_db = tbl->view_db.str;
local_table_name = tbl->view_name.str;
} else if (tbl->is_derived()) {
/* Initialize privileges for derived tables */
tbl->grant.privilege = SELECT_ACL;
continue;
} else {
local_db = tbl->db;
local_table_name = tbl->get_table_name();
}
fill_effective_table_privileges(thd, &tbl->grant, local_db,
local_table_name);
}
thd->set_security_context(save_security_ctx);
return false;
}
Natural_join_column::Natural_join_column(Field_translator *field_param,
TABLE_LIST *tab) {
DBUG_ASSERT(tab->field_translation);
view_field = field_param;
table_field = NULL;
table_ref = tab;
is_common = false;
}
Natural_join_column::Natural_join_column(Item_field *field_param,
TABLE_LIST *tab) {
DBUG_ASSERT(tab->table == field_param->field->table);
table_field = field_param;
/*
Cache table, to have no resolution problem after natural join nests have
been changed to ordinary join nests.
*/
if (tab->cacheable_table) field_param->cached_table = tab;
view_field = NULL;
table_ref = tab;
is_common = false;
}
const char *Natural_join_column::name() {
if (view_field) {
DBUG_ASSERT(table_field == NULL);
return view_field->name;
}
return table_field->field_name;
}
Item *Natural_join_column::create_item(THD *thd) {
if (view_field) {
DBUG_ASSERT(table_field == NULL);
SELECT_LEX *select = thd->lex->current_select();
return create_view_field(thd, table_ref, &view_field->item,
view_field->name, &select->context);
}
return table_field;
}
Field *Natural_join_column::field() {
if (view_field) {
DBUG_ASSERT(table_field == NULL);
return NULL;
}
return table_field->field;
}
const char *Natural_join_column::table_name() {
DBUG_ASSERT(table_ref);
return table_ref->alias;
}
const char *Natural_join_column::db_name() {
if (view_field) return table_ref->view_db.str;
/*
Test that TABLE_LIST::db is the same as TABLE_SHARE::db to
ensure consistency. An exception are I_S schema tables, which
are inconsistent in this respect.
*/
DBUG_ASSERT(!strcmp(table_ref->db, table_ref->table->s->db.str) ||
(table_ref->schema_table &&
is_infoschema_db(table_ref->table->s->db.str,
table_ref->table->s->db.length)));
return table_ref->db;
}
GRANT_INFO *Natural_join_column::grant() { return &table_ref->grant; }
void Field_iterator_view::set(TABLE_LIST *table) {
DBUG_ASSERT(table->field_translation);
view = table;
ptr = table->field_translation;
array_end = table->field_translation_end;
}
const char *Field_iterator_table::name() { return (*ptr)->field_name; }
Item *Field_iterator_table::create_item(THD *thd) {
SELECT_LEX *select = thd->lex->current_select();
Item_field *item = new Item_field(thd, &select->context, *ptr);
if (!item) return nullptr;
/*
This function creates Item-s which don't go through fix_fields(); see same
code in Item_field::fix_fields().
*/
if (is_null_on_empty_table(thd, item)) {
item->maybe_null = true;
(*ptr)->table->set_nullable();
}
return item;
}
const char *Field_iterator_view::name() { return ptr->name; }
Item *Field_iterator_view::create_item(THD *thd) {
SELECT_LEX *select = thd->lex->current_select();
return create_view_field(thd, view, &ptr->item, ptr->name, &select->context);
}
static Item *create_view_field(THD *thd, TABLE_LIST *view, Item **field_ref,
const char *name,
Name_resolution_context *context) {
Item *field = *field_ref;
const char *table_name;
DBUG_TRACE;
if (view->schema_table_reformed) {
/*
Translation table items are always Item_fields and already fixed
('mysql_schema_table' function). So we can return directly the
field. This case happens only for 'show & where' commands.
*/
DBUG_ASSERT(field && field->fixed);
return field;
}
DBUG_ASSERT(field);
if (!field->fixed) {
if (field->fix_fields(thd, field_ref)) return NULL; /* purecov: inspected */
field = *field_ref;
}
/*
Original table name of a field is calculated as follows:
- For a view or base table, the view or base table name.
- For a derived table, the base table name.
- For an expression that is not a simple column reference, an empty string.
*/
if (view->is_derived()) {
while (field->type() == Item::REF_ITEM) {
field = down_cast<Item_ref *>(field)->ref[0];
}
if (field->type() == Item::FIELD_ITEM)
table_name = thd->mem_strdup(down_cast<Item_field *>(field)->table_name);
else
table_name = "";
} else {
table_name = view->table_name;
}
/*
@note Creating an Item_view_ref object on top of an Item_field
means that the underlying Item_field object may be shared by
multiple occurrences of superior fields. This is a vulnerable
practice, so special precaution must be taken to avoid programming
mistakes, such as forgetting to mark the use of a field in both
read_set and write_set (may happen e.g in an UPDATE statement).
*/
Item *item = new Item_view_ref(context, field_ref, view->alias, table_name,
name, view);
return item;
}
void Field_iterator_natural_join::set(TABLE_LIST *table_ref) {
DBUG_ASSERT(table_ref->join_columns);
column_ref_it.init(*(table_ref->join_columns));
cur_column_ref = column_ref_it++;
}
void Field_iterator_natural_join::next() {
cur_column_ref = column_ref_it++;
DBUG_ASSERT(!cur_column_ref || !cur_column_ref->table_field ||
cur_column_ref->table_ref->table ==
cur_column_ref->table_field->field->table);
}
void Field_iterator_table_ref::set_field_iterator() {
DBUG_TRACE;
/*
If the table reference we are iterating over is a natural join, or it is
an operand of a natural join, and TABLE_LIST::join_columns contains all
the columns of the join operand, then we pick the columns from
TABLE_LIST::join_columns, instead of the orginial container of the
columns of the join operator.
*/
if (table_ref->is_join_columns_complete) {
/* Necesary, but insufficient conditions. */
DBUG_ASSERT(
table_ref->is_natural_join || table_ref->nested_join ||
(table_ref->join_columns &&
/* This is a merge view. */
((table_ref->field_translation &&
table_ref->join_columns->elements ==
(ulong)(table_ref->field_translation_end -
table_ref->field_translation)) ||
/* This is stored table or a tmptable view. */
(!table_ref->field_translation &&
table_ref->join_columns->elements == table_ref->table->s->fields))));
field_it = &natural_join_it;
DBUG_PRINT("info", ("field_it for '%s' is Field_iterator_natural_join",
table_ref->alias));
}
/* This is a merge view, so use field_translation. */
else if (table_ref->field_translation) {
DBUG_ASSERT(table_ref->is_merged());
field_it = &view_field_it;
DBUG_PRINT("info",
("field_it for '%s' is Field_iterator_view", table_ref->alias));
}
/* This is a base table or stored view. */
else {
DBUG_ASSERT(table_ref->table || table_ref->is_view());
field_it = &table_field_it;
DBUG_PRINT("info",
("field_it for '%s' is Field_iterator_table", table_ref->alias));
}
field_it->set(table_ref);
}
void Field_iterator_table_ref::set(TABLE_LIST *table) {
DBUG_ASSERT(table);
first_leaf = table->first_leaf_for_name_resolution();
last_leaf = table->last_leaf_for_name_resolution();
DBUG_ASSERT(first_leaf && last_leaf);
table_ref = first_leaf;
set_field_iterator();
}
void Field_iterator_table_ref::next() {
/* Move to the next field in the current table reference. */
field_it->next();
/*
If all fields of the current table reference are exhausted, move to
the next leaf table reference.
*/
if (field_it->end_of_fields() && table_ref != last_leaf) {
table_ref = table_ref->next_name_resolution_table;
DBUG_ASSERT(table_ref);
set_field_iterator();
}
}
const char *Field_iterator_table_ref::get_table_name() {
if (table_ref->is_view())
return table_ref->view_name.str;
else if (table_ref->is_natural_join)
return natural_join_it.column_ref()->table_name();
DBUG_ASSERT(
table_ref->is_table_function() ||
!strcmp(table_ref->table_name, table_ref->table->s->table_name.str));
return table_ref->table_name;
}
const char *Field_iterator_table_ref::get_db_name() {
if (table_ref->is_view())
return table_ref->view_db.str;
else if (table_ref->is_natural_join)
return natural_join_it.column_ref()->db_name();
/*
Test that TABLE_LIST::db is the same as TABLE_SHARE::db to
ensure consistency. An exception are I_S schema tables, which
are inconsistent in this respect and any_db (used in the handler
interface to manage aliases).
*/
DBUG_ASSERT(!strcmp(table_ref->db, table_ref->table->s->db.str) ||
table_ref->db == any_db ||
(table_ref->schema_table &&
is_infoschema_db(table_ref->table->s->db.str,
table_ref->table->s->db.length)));
return table_ref->db == any_db ? table_ref->table->s->db.str : table_ref->db;
}
GRANT_INFO *Field_iterator_table_ref::grant() {
if (table_ref->is_natural_join)
return natural_join_it.column_ref()->grant();
else
return &table_ref->grant;
}
/**
Create new or return existing column reference to a column of a
natural/using join.
@param thd Session.
@param parent_table_ref the parent table reference over which the
iterator is iterating
Create a new natural join column for the current field of the
iterator if no such column was created, or return an already
created natural join column. The former happens for base tables or
views, and the latter for natural/using joins. If a new field is
created, then the field is added to 'parent_table_ref' if it is
given, or to the original table referene of the field if
parent_table_ref == NULL.
@note
This method is designed so that when a Field_iterator_table_ref
walks through the fields of a table reference, all its fields
are created and stored as follows:
- If the table reference being iterated is a stored table, view or
natural/using join, store all natural join columns in a list
attached to that table reference.
- If the table reference being iterated is a nested join that is
not natural/using join, then do not materialize its result
fields. This is OK because for such table references
Field_iterator_table_ref iterates over the fields of the nested
table references (recursively). In this way we avoid the storage
of unnecessay copies of result columns of nested joins.
@retval other Pointer to a column of a natural join (or its operand)
@retval NULL No memory to allocate the column
*/
Natural_join_column *Field_iterator_table_ref::get_or_create_column_ref(
THD *thd, TABLE_LIST *parent_table_ref) {
Natural_join_column *nj_col;
bool is_created = true;
uint field_count = 0;
TABLE_LIST *add_table_ref = parent_table_ref ? parent_table_ref : table_ref;
if (field_it == &table_field_it) {
/* The field belongs to a stored table. */
Field *tmp_field = table_field_it.field();
Item_field *tmp_item =
new Item_field(thd, &thd->lex->current_select()->context, tmp_field);
if (!tmp_item) return NULL;
nj_col = new (thd->mem_root) Natural_join_column(tmp_item, table_ref);
field_count = table_ref->table->s->fields;
} else if (field_it == &view_field_it) {
/* The field belongs to a merge view or information schema table. */
Field_translator *translated_field = view_field_it.field_translator();
nj_col =
new (thd->mem_root) Natural_join_column(translated_field, table_ref);
field_count =
table_ref->field_translation_end - table_ref->field_translation;
} else {
/*
The field belongs to a NATURAL join, therefore the column reference was
already created via one of the two constructor calls above. In this case
we just return the already created column reference.
*/
DBUG_ASSERT(table_ref->is_join_columns_complete);
is_created = false;
nj_col = natural_join_it.column_ref();
DBUG_ASSERT(nj_col);
}
DBUG_ASSERT(!nj_col->table_field ||
nj_col->table_ref->table == nj_col->table_field->field->table);
/*
If the natural join column was just created add it to the list of
natural join columns of either 'parent_table_ref' or to the table
reference that directly contains the original field.
*/
if (is_created) {
/* Make sure not all columns were materialized. */
DBUG_ASSERT(!add_table_ref->is_join_columns_complete);
if (!add_table_ref->join_columns) {
/* Create a list of natural join columns on demand. */
if (!(add_table_ref->join_columns =
new (thd->mem_root) List<Natural_join_column>))
return NULL;
add_table_ref->is_join_columns_complete = false;
}
add_table_ref->join_columns->push_back(nj_col);
/*
If new fields are added to their original table reference, mark if
all fields were added. We do it here as the caller has no easy way
of knowing when to do it.
If the fields are being added to parent_table_ref, then the caller
must take care to mark when all fields are created/added.
*/
if (!parent_table_ref &&
add_table_ref->join_columns->elements == field_count)
add_table_ref->is_join_columns_complete = true;
}
return nj_col;
}
/**
Return an existing reference to a column of a natural/using join.
The method should be called in contexts where it is expected that
all natural join columns are already created, and that the column
being retrieved is a Natural_join_column.
@retval other Pointer to a column of a natural join (or its operand)
@retval NULL No memory to allocate the column
*/
Natural_join_column *Field_iterator_table_ref::get_natural_column_ref() {
Natural_join_column *nj_col;
DBUG_ASSERT(field_it == &natural_join_it);
/*
The field belongs to a NATURAL join, therefore the column reference was
already created via one of the two constructor calls above. In this case
we just return the already created column reference.
*/
nj_col = natural_join_it.column_ref();
DBUG_ASSERT(nj_col &&
(!nj_col->table_field ||
nj_col->table_ref->table == nj_col->table_field->field->table));
return nj_col;
}
/*****************************************************************************
Functions to handle column usage bitmaps (read_set, write_set etc...)
*****************************************************************************/
/* Reset all columns bitmaps */
void TABLE::clear_column_bitmaps() {
/*
Reset column read/write usage. It's identical to:
bitmap_clear_all(&table->def_read_set);
bitmap_clear_all(&table->def_write_set);
*/
memset(def_read_set.bitmap, 0, s->column_bitmap_size * 2);
column_bitmaps_set(&def_read_set, &def_write_set);
bitmap_clear_all(&def_fields_set_during_insert);
fields_set_during_insert = &def_fields_set_during_insert;
bitmap_clear_all(&tmp_set);
if (m_partial_update_columns != nullptr)
bitmap_clear_all(m_partial_update_columns);
}
/**
Tell handler we are going to call position() and rnd_pos() later.
This is needed for handlers that uses the primary key to find the
row. In this case we have to extend the read bitmap with the primary
key fields.
@note: Calling this function does not initialize the table for
reading using rnd_pos(). rnd_init() still has to be called before
rnd_pos().
*/
void TABLE::prepare_for_position() {
DBUG_TRACE;
if ((file->ha_table_flags() & HA_PRIMARY_KEY_REQUIRED_FOR_POSITION) &&
s->primary_key < MAX_KEY) {
mark_columns_used_by_index_no_reset(s->primary_key, read_set);
/* signal change */
file->column_bitmaps_signal();
}
}
/**
Mark column as either read or written (or none) according to mark_used.
@note If marking a written field, set thd->dup_field if the column is
already marked.
@note If TABLE::get_fields_in_item_tree is set, set the flag bit
GET_FIXED_FIELDS_FLAG for the field.
@param field The column to be marked as used
@param mark =MARK_COLUMNS_NONE: Only update flag field, if applicable
=MARK_COLUMNS_READ: Mark column as read
=MARK_COLUMNS_WRITE: Mark column as written
=MARK_COLUMNS_TEMP: Mark column as read, used by filesort()
and processing of generated columns
*/
void TABLE::mark_column_used(Field *field, enum enum_mark_columns mark) {
DBUG_TRACE;
switch (mark) {
case MARK_COLUMNS_NONE:
if (get_fields_in_item_tree) field->flags |= GET_FIXED_FIELDS_FLAG;
break;
case MARK_COLUMNS_READ: {
Key_map part_of_key = field->part_of_key;
bitmap_set_bit(read_set, field->field_index);
part_of_key.merge(field->part_of_prefixkey);
covering_keys.intersect(part_of_key);
merge_keys.merge(field->part_of_key);
if (get_fields_in_item_tree) field->flags |= GET_FIXED_FIELDS_FLAG;
if (field->is_virtual_gcol()) mark_gcol_in_maps(field);
break;
}
case MARK_COLUMNS_WRITE:
bitmap_set_bit(write_set, field->field_index);
DBUG_ASSERT(!get_fields_in_item_tree);
if (field->is_gcol()) mark_gcol_in_maps(field);
break;
case MARK_COLUMNS_TEMP:
bitmap_set_bit(read_set, field->field_index);
if (field->is_virtual_gcol()) mark_gcol_in_maps(field);
break;
}
}
/*
Mark that only fields from one key is used
NOTE:
This changes the bitmap to use the tmp bitmap
After this, you can't access any other columns in the table until
bitmaps are reset, for example with TABLE::clear_column_bitmaps().
*/
void TABLE::mark_columns_used_by_index(uint index) {
MY_BITMAP *bitmap = &tmp_set;
DBUG_TRACE;
set_keyread(true);
bitmap_clear_all(bitmap);
mark_columns_used_by_index_no_reset(index, bitmap);
column_bitmaps_set(bitmap, bitmap);
}
/*
mark columns used by key, but don't reset other fields
The parameter key_parts is used for controlling how many of the
key_parts that will be marked in the bitmap. It has the following
interpretation:
= 0: Use all regular key parts from the key
(user_defined_key_parts)
>= actual_key_parts: Use all regular and extended columns
< actual_key_parts: Use this exact number of key parts
To use all regular key parts, the caller can use the default value (0).
To use all regular and extended key parts, use UINT_MAX.
@note The bit map is not cleared by this function. Only bits
corresponding to a column used by the index will be set. Bits
representing columns not used by the index will not be changed.
@param index index number
@param bitmap bitmap to mark
@param key_parts number of leading key parts to mark. Default is 0.
@todo consider using actual_key_parts(key_info[index]) instead of
key_info[index].user_defined_key_parts: if the PK suffix of a secondary
index is usable it should be marked.
*/
void TABLE::mark_columns_used_by_index_no_reset(uint index, MY_BITMAP *bitmap,
uint key_parts) const {
// If key_parts has the default value, then include user defined key parts
if (key_parts == 0)
key_parts = key_info[index].user_defined_key_parts;
else if (key_parts > key_info[index].actual_key_parts)
key_parts = key_info[index].actual_key_parts;
KEY_PART_INFO *key_part = key_info[index].key_part;
KEY_PART_INFO *key_part_end = key_part + key_parts;
for (; key_part != key_part_end; key_part++)
bitmap_set_bit(bitmap, key_part->fieldnr - 1);
}
/**
Mark auto-increment fields as used fields in both read and write maps
@note
This is needed in insert & update as the auto-increment field is
always set and sometimes read.
*/
void TABLE::mark_auto_increment_column() {
DBUG_ASSERT(found_next_number_field);
/*
We must set bit in read set as update_auto_increment() is using the
store() to check overflow of auto_increment values
*/
bitmap_set_bit(read_set, found_next_number_field->field_index);
bitmap_set_bit(write_set, found_next_number_field->field_index);
if (s->next_number_keypart)
mark_columns_used_by_index_no_reset(s->next_number_index, read_set);
file->column_bitmaps_signal();
}
/*
Mark columns needed for doing an delete of a row
DESCRIPTON
Some table engines don't have a cursor on the retrieve rows
so they need either to use the primary key or all columns to
be able to delete a row.
If the engine needs this, the function works as follows:
- If primary key exits, mark the primary key columns to be read.
- If not, mark all columns to be read
If the engine has HA_REQUIRES_KEY_COLUMNS_FOR_DELETE, we will
mark all key columns as 'to-be-read'. This allows the engine to
loop over the given record to find all keys and doesn't have to
retrieve the row again.
*/
void TABLE::mark_columns_needed_for_delete(THD *thd) {
mark_columns_per_binlog_row_image(thd);
if (triggers && triggers->mark_fields(TRG_EVENT_DELETE)) return;
if (file->ha_table_flags() & HA_REQUIRES_KEY_COLUMNS_FOR_DELETE) {
Field **reg_field;
for (reg_field = field; *reg_field; reg_field++) {
if ((*reg_field)->flags & PART_KEY_FLAG)
bitmap_set_bit(read_set, (*reg_field)->field_index);
}
file->column_bitmaps_signal();
}
if (file->ha_table_flags() & HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) {
/*
If the handler has no cursor capabilites we have to read
either the primary key, the hidden primary key or all columns to
be able to do an delete
*/
if (s->primary_key == MAX_KEY) {
/*
If in RBR, we have alreay marked the full before image
in mark_columns_per_binlog_row_image, if not, then use
the hidden primary key
*/
if (!(mysql_bin_log.is_open() && in_use &&
in_use->is_current_stmt_binlog_format_row()))
file->use_hidden_primary_key();
} else
mark_columns_used_by_index_no_reset(s->primary_key, read_set);
file->column_bitmaps_signal();
}
if (vfield) {
/*
InnoDB's delete_row may need to log pre-image of the index entries to
its UNDO log. Thus, indexed virtual generated column must be made ready
for evaluation.
*/
mark_generated_columns(true);
}
}
/**
@brief
Mark columns needed for doing an update of a row
@details
Some engines needs to have all columns in an update (to be able to
build a complete row). If this is the case, we mark all not
updated columns to be read.
If this is not the case, we do like in the delete case and mark
if neeed, either the primary key column or all columns to be read.
(see mark_columns_needed_for_delete() for details)
If the engine has HA_REQUIRES_KEY_COLUMNS_FOR_DELETE, we will
mark all USED key columns as 'to-be-read'. This allows the engine to
loop over the given record to find all changed keys and doesn't have to
retrieve the row again.
Unlike other similar methods, it doesn't mark fields used by triggers,
that is the responsibility of the caller to do, by using
Table_trigger_dispatcher::mark_used_fields(TRG_EVENT_UPDATE)!
Note: Marking additional columns as per binlog_row_image requirements will
influence query execution plan. For example in the case of
binlog_row_image=FULL the entire read_set and write_set needs to be flagged.
This will influence update query to think that 'used key is being modified'
and query will create a temporary table to process the update operation.
Which will result in performance degradation. Hence callers who don't want
their query execution to be influenced as per binlog_row_image requirements
can skip marking binlog specific columns here and they should make an
explicit call to 'mark_columns_per_binlog_row_image()' function to mark
binlog_row_image specific columns.
*/
void TABLE::mark_columns_needed_for_update(THD *thd, bool mark_binlog_columns) {
DBUG_TRACE;
if (mark_binlog_columns) mark_columns_per_binlog_row_image(thd);
if (file->ha_table_flags() & HA_REQUIRES_KEY_COLUMNS_FOR_DELETE) {
/* Mark all used key columns for read */
Field **reg_field;
for (reg_field = field; *reg_field; reg_field++) {
/* Merge keys is all keys that had a column refered to in the query */
if (merge_keys.is_overlapping((*reg_field)->part_of_key))
bitmap_set_bit(read_set, (*reg_field)->field_index);
}
file->column_bitmaps_signal();
}
if (file->ha_table_flags() & HA_PRIMARY_KEY_REQUIRED_FOR_DELETE) {
/*
If the handler has no cursor capabilites we have to read either
the primary key, the hidden primary key or all columns to be
able to do an update
*/
if (s->primary_key == MAX_KEY) {
/*
If in RBR, we have alreay marked the full before image
in mark_columns_per_binlog_row_image, if not, then use
the hidden primary key
*/
if (!(mysql_bin_log.is_open() && in_use &&
in_use->is_current_stmt_binlog_format_row()))
file->use_hidden_primary_key();
} else
mark_columns_used_by_index_no_reset(s->primary_key, read_set);
file->column_bitmaps_signal();
}
/* Mark dependent generated columns as writable */
if (vfield) mark_generated_columns(true);
/* Mark columns needed for check constraints evaluation */
if (table_check_constraint_list != nullptr)
mark_check_constraint_columns(true);
}
/*
Mark columns according the binlog row image option.
When logging in RBR, the user can select whether to
log partial or full rows, depending on the table
definition, and the value of binlog_row_image.
Semantics of the binlog_row_image are the following
(PKE - primary key equivalent, ie, PK fields if PK
exists, all fields otherwise):
binlog_row_image= MINIMAL
- This marks the PKE fields in the read_set
- This marks all fields where a value was specified
in the write_set
binlog_row_image= NOBLOB
- This marks PKE + all non-blob fields in the read_set
- This marks all fields where a value was specified
and all non-blob fields in the write_set
binlog_row_image= FULL
- all columns in the read_set
- all columns in the write_set
This marking is done without resetting the original
bitmaps. This means that we will strip extra fields in
the read_set at binlogging time (for those cases that
we only want to log a PK and we needed other fields for
execution).
*/
void TABLE::mark_columns_per_binlog_row_image(THD *thd) {
DBUG_TRACE;
DBUG_ASSERT(read_set->bitmap);
DBUG_ASSERT(write_set->bitmap);
/**
If in RBR we may need to mark some extra columns,
depending on the binlog-row-image command line argument.
*/
if ((mysql_bin_log.is_open() && in_use &&
in_use->is_current_stmt_binlog_format_row() &&
!ha_check_storage_engine_flag(s->db_type(), HTON_NO_BINLOG_ROW_OPT))) {
/* if there is no PK, then mark all columns for the BI. */
if (s->primary_key >= MAX_KEY) bitmap_set_all(read_set);
switch (thd->variables.binlog_row_image) {
case BINLOG_ROW_IMAGE_FULL:
if (s->primary_key < MAX_KEY) bitmap_set_all(read_set);
bitmap_set_all(write_set);
break;
case BINLOG_ROW_IMAGE_NOBLOB:
/* for every field that is not set, mark it unless it is a blob */
for (Field **ptr = field; *ptr; ptr++) {
Field *my_field = *ptr;
/*
bypass blob fields. These can be set or not set, we don't care.
Later, at binlogging time, if we don't need them in the before
image, we will discard them.
If set in the AI, then the blob is really needed, there is
nothing we can do about it.
*/
if ((s->primary_key < MAX_KEY) &&
((my_field->flags & PRI_KEY_FLAG) ||
(my_field->type() != MYSQL_TYPE_BLOB)))
bitmap_set_bit(read_set, my_field->field_index);
if (my_field->type() != MYSQL_TYPE_BLOB)
bitmap_set_bit(write_set, my_field->field_index);
}
break;
case BINLOG_ROW_IMAGE_MINIMAL:
/* mark the primary key if available in the read_set */
if (s->primary_key < MAX_KEY)
mark_columns_used_by_index_no_reset(s->primary_key, read_set);
break;
default:
DBUG_ASSERT(false);
}
file->column_bitmaps_signal();
}
}
/**
Allocate space for keys, for a materialized derived table.
@param key_count Number of keys to allocate.
@param modify_share Do modificationts to TABLE_SHARE.
When modifying TABLE, modifications to TABLE_SHARE are needed, so that both
objects remain consistent. Even if several TABLEs point to the same
TABLE_SHARE, those modifications must be done only once (consider for
example, incremementing TABLE_SHARE::keys). Should they be done when
processing the first TABLE, or the second, or? In case this function, when
updating TABLE, relies on TABLE_SHARE members which are the subject of
modifications, we follow this rule: do those TABLE_SHARE member
modifications first: thus, TABLE-modifying code can be identical for all
TABLEs. So the _first_ TABLE calling this function, only, should pass
'true': all next ones should not modify the TABLE_SHARE.
@returns true if error
*/
bool TABLE::alloc_tmp_keys(uint key_count, bool modify_share) {
const size_t bytes = sizeof(KEY) * key_count;
if (modify_share) {
s->max_tmp_keys = key_count;
/*
s->keyinfo may pre-exist, if keys have already been added to another
reference to the same CTE in another query block.
*/
KEY *old_ki = s->key_info;
if (!(s->key_info = static_cast<KEY *>(s->mem_root.Alloc(bytes))))
return true; /* purecov: inspected */
memset(s->key_info, 0, bytes);
if (old_ki) memcpy(s->key_info, old_ki, sizeof(KEY) * s->keys);
}
// Catch if the caller didn't respect the rule for 'modify_share'
DBUG_ASSERT(s->max_tmp_keys == key_count);
KEY *old_ki = key_info;
if (!(key_info = static_cast<KEY *>(s->mem_root.Alloc(bytes))))
return true; /* purecov: inspected */
memset(key_info, 0, bytes);
if (old_ki) memcpy(key_info, old_ki, sizeof(KEY) * s->keys);
return false;
}
/**
@brief Add one key to a materialized derived table.
@param key_parts bitmap of fields that take a part in the key.
@param key_name name of the key
@param invisible If true, set up bitmaps so the key is never used by
this TABLE
@param modify_share @see alloc_tmp_keys
@details
Creates a key for this table from fields which corresponds the bits set to 1
in the 'key_parts' bitmap. The 'key_name' name is given to the newly created
key. In the key, columns are in the same order as in the table.
@see add_derived_key
@todo somehow manage to create keys in tmp_table_param for unification
purposes
@return true OOM error.
@return false the key was created or ignored (too long key).
*/
bool TABLE::add_tmp_key(Field_map *key_parts, char *key_name, bool invisible,
bool modify_share) {
DBUG_ASSERT(!created && key_parts);
Field **reg_field;
uint i;
bool key_start = true;
uint field_count = 0;
uint key_len = 0;
for (i = 0, reg_field = field; *reg_field; i++, reg_field++) {
if (key_parts->is_set(i)) {
KEY_PART_INFO tkp;
// Ensure that we're not creating a key over a blob field.
DBUG_ASSERT(!((*reg_field)->flags & BLOB_FLAG));
/*
Check if possible key is too long, ignore it if so.
The reason to use MI_MAX_KEY_LENGTH (myisam's default) is that it is
smaller than MAX_KEY_LENGTH (heap's default) and it's unknown whether
myisam or heap will be used for tmp table.
*/
tkp.init_from_field(*reg_field);
key_len += tkp.store_length;
if (key_len > MI_MAX_KEY_LENGTH) {
return false;
}
}
field_count++;
}
const uint key_part_count = key_parts->bits_set();
// Code above didn't change TABLE; start with changing TABLE_SHARE:
if (modify_share) {
set_if_bigger(s->max_key_length, key_len);
s->key_parts += key_part_count;
DBUG_ASSERT(s->keys < s->max_tmp_keys);
s->keys++;
}
const uint keyno = s->keys - 1;
KEY *cur_key = key_info + keyno;
cur_key->usable_key_parts = cur_key->user_defined_key_parts = key_part_count;
cur_key->actual_key_parts = cur_key->user_defined_key_parts;
cur_key->key_length = key_len;
cur_key->algorithm = HA_KEY_ALG_BTREE;
cur_key->name = key_name;
cur_key->actual_flags = cur_key->flags = HA_GENERATED_KEY;
cur_key->set_in_memory_estimate(IN_MEMORY_ESTIMATE_UNKNOWN);
/*
Allocate storage for the key part array and the two rec_per_key arrays in
the tables' mem_root.
*/
const size_t key_buf_size = sizeof(KEY_PART_INFO) * key_part_count;
ulong *rec_per_key;
rec_per_key_t *rec_per_key_float;
uchar *key_buf;
KEY_PART_INFO *key_part_info;
if (!multi_alloc_root(&s->mem_root, &key_buf, key_buf_size, &rec_per_key,
sizeof(ulong) * key_part_count, &rec_per_key_float,
sizeof(rec_per_key_t) * key_part_count, NULL))
return true; /* purecov: inspected */
memset(key_buf, 0, key_buf_size);
cur_key->key_part = key_part_info = (KEY_PART_INFO *)key_buf;
cur_key->set_rec_per_key_array(rec_per_key, rec_per_key_float);
cur_key->table = this;
/* Initialize rec_per_key and rec_per_key_float */
for (uint kp = 0; kp < key_part_count; ++kp) {
cur_key->rec_per_key[kp] = 0;
cur_key->set_records_per_key(kp, REC_PER_KEY_UNKNOWN);
}
if (!invisible) {
if (field_count == key_part_count) covering_keys.set_bit(keyno);
keys_in_use_for_group_by.set_bit(keyno);
keys_in_use_for_order_by.set_bit(keyno);
}
for (i = 0, reg_field = field; *reg_field; i++, reg_field++) {
if (!(key_parts->is_set(i))) continue;
if (key_start) (*reg_field)->key_start.set_bit(keyno);
key_start = false;
(*reg_field)->part_of_key.set_bit(keyno);
(*reg_field)->part_of_sortkey.set_bit(keyno);
(*reg_field)->flags |= PART_KEY_FLAG;
key_part_info->init_from_field(*reg_field);
key_part_info++;
}
if (modify_share) {
/*
We copy the TABLE's key_info to the TABLE_SHARE's key_info. Some of the
copied info is constant over all instances of TABLE,
e.g. s->key_info[keyno].key_part[i].key_part_flag, so can be
legally accessed from the share. On the other hand, TABLE-specific
members (rec_per_key, field, etc) of the TABLE's key_info shouldn't be
accessed from the share.
*/
KEY &sk = s->key_info[keyno];
sk = *cur_key;
sk.table = nullptr; // catch any illegal access
sk.set_rec_per_key_array(nullptr, nullptr);
}
return false;
}
/**
For a materialized derived table: informs the share that certain
not-yet-used keys are going to be used.
@param k Used keys
@returns New position of first not-yet-used key.
*/
uint TABLE_SHARE::find_first_unused_tmp_key(const Key_map &k) {
while (first_unused_tmp_key < MAX_INDEXES && k.is_set(first_unused_tmp_key))
first_unused_tmp_key++; // locate the first free slot
return first_unused_tmp_key;
}
/**
For a materialized derived table: copies a KEY definition from a position to
the first not-yet-used position (which is lower).
@param old_idx source position
@param modify_share @see alloc_tmp_keys
*/
void TABLE::copy_tmp_key(int old_idx, bool modify_share) {
if (modify_share)
s->key_info[s->first_unused_tmp_key++] = s->key_info[old_idx];
const int new_idx = s->first_unused_tmp_key - 1;
DBUG_ASSERT(!created && new_idx < old_idx && old_idx < (int)s->keys);
key_info[new_idx] = key_info[old_idx];
for (auto reg_field = field; *reg_field; reg_field++) {
auto f = *reg_field;
f->key_start.clear_bit(new_idx);
if (f->key_start.is_set(old_idx)) f->key_start.set_bit(new_idx);
f->part_of_key.clear_bit(new_idx);
if (f->part_of_key.is_set(old_idx)) f->part_of_key.set_bit(new_idx);
f->part_of_sortkey.clear_bit(new_idx);
if (f->part_of_sortkey.is_set(old_idx)) f->part_of_sortkey.set_bit(new_idx);
}
covering_keys.clear_bit(new_idx);
if (covering_keys.is_set(old_idx)) covering_keys.set_bit(new_idx);
keys_in_use_for_group_by.clear_bit(new_idx);
if (keys_in_use_for_group_by.is_set(old_idx))
keys_in_use_for_group_by.set_bit(new_idx);
keys_in_use_for_order_by.clear_bit(new_idx);
if (keys_in_use_for_order_by.is_set(old_idx))
keys_in_use_for_order_by.set_bit(new_idx);
}
/**
For a materialized derived table: after copy_tmp_key() has copied all
definitions of used KEYs, in TABLE::key_info we have a head of used keys
followed by a tail of unused keys; this function chops the tail.
@param modify_share @see alloc_tmp_keys
*/
void TABLE::drop_unused_tmp_keys(bool modify_share) {
if (modify_share) {
DBUG_ASSERT(s->first_unused_tmp_key <= s->keys);
s->keys = s->first_unused_tmp_key;
s->key_parts = 0;
for (uint i = 0; i < s->keys; i++)
s->key_parts += s->key_info[i].user_defined_key_parts;
if (s->first_unused_tmp_key == 0) s->key_info = nullptr;
}
if (!s->key_info) key_info = nullptr;
const Key_map keys_to_keep(s->keys);
for (auto reg_field = field; *reg_field; reg_field++) {
auto f = *reg_field;
f->key_start.intersect(keys_to_keep);
f->part_of_key.intersect(keys_to_keep);
if (f->part_of_key.is_clear_all()) f->flags &= ~PART_KEY_FLAG;
f->part_of_sortkey.intersect(keys_to_keep);
}
// Eliminate unused keys; make other keys visible
covering_keys.intersect(keys_to_keep);
for (uint keyno = 0; keyno < s->keys; keyno++)
if (key_info[keyno].actual_key_parts == s->fields)
covering_keys.set_bit(keyno);
keys_in_use_for_group_by.set_prefix(s->keys);
keys_in_use_for_order_by.set_prefix(s->keys);
}
void TABLE::set_keyread(bool flag) {
DBUG_ASSERT(file);
if (flag && !key_read) {
key_read = 1;
if (is_created()) file->ha_extra(HA_EXTRA_KEYREAD);
} else if (!flag && key_read) {
key_read = 0;
if (is_created()) file->ha_extra(HA_EXTRA_NO_KEYREAD);
}
}
void TABLE::set_created() {
if (created) return;
if (key_read) file->ha_extra(HA_EXTRA_KEYREAD);
created = true;
}
/*
Mark columns the handler needs for doing an insert
For now, this is used to mark fields used by the trigger
as changed.
*/
void TABLE::mark_columns_needed_for_insert(THD *thd) {
mark_columns_per_binlog_row_image(thd);
if (found_next_number_field) mark_auto_increment_column();
/* Mark all generated columns as writable */
if (vfield) mark_generated_columns(false);
/* Mark columns needed for check constraints evaluation */
if (table_check_constraint_list != nullptr)
mark_check_constraint_columns(false);
}
/*
@brief Update the write/read_set for generated columns
when doing update and insert operation.
@param is_update true means the operation is UPDATE.
false means it's INSERT.
@return void
@detail
Prerequisites for INSERT:
- write_map is filled with all base columns.
- read_map is filled with base columns and generated columns to be read.
Otherwise, it is empty. covering_keys and merge_keys are adjusted according
to read_map.
Actions for INSERT:
- Fill write_map with all generated columns.
Stored columns are needed because their values will be stored.
Virtual columns are needed because their values must be checked against
constraints and it might be referenced by latter generated columns.
- Fill read_map with base columns for all generated columns.
This has no technical reason, but is required because the function that
evaluates generated functions asserts that base columns are in the read_map.
covering_keys and merge_keys are adjusted according to read_map.
Prerequisites for UPDATE:
- write_map is filled with base columns to be updated.
- read_map is filled with base columns and generated columns to be read
prior to the row update. covering_keys and merge_keys are adjusted
according to read_map.
Actions for UPDATE:
- Fill write_map with generated columns that are dependent on updated base
columns and all virtual generated columns. Stored columns are needed because
their values will be stored. Virtual columns are needed because their values
must be checked against constraints and might be referenced by latter
generated columns.
*/
void TABLE::mark_generated_columns(bool is_update) {
Field **vfield_ptr, *tmp_vfield;
bool bitmap_updated = false;
if (is_update) {
MY_BITMAP dependent_fields;
my_bitmap_map
bitbuf[bitmap_buffer_size(MAX_FIELDS) / sizeof(my_bitmap_map)];
bitmap_init(&dependent_fields, bitbuf, s->fields, 0);
for (vfield_ptr = vfield; *vfield_ptr; vfield_ptr++) {
tmp_vfield = *vfield_ptr;
DBUG_ASSERT(tmp_vfield->gcol_info && tmp_vfield->gcol_info->expr_item);
/*
We need to evaluate the GC if:
- it depends on any updated column
- or it is virtual indexed, for example:
* UPDATE changes the primary key's value, and the virtual index
is a secondary index which includes the pk's value
* the gcol is in a multi-column index, and UPDATE changes another
column of this index
* in both cases the entry in the index needs to change, so needs to
be located first, for that the GC's value is needed.
*/
if ((!tmp_vfield->stored_in_db && tmp_vfield->m_indexed) ||
bitmap_is_overlapping(write_set,
&tmp_vfield->gcol_info->base_columns_map)) {
// The GC needs to be updated
tmp_vfield->table->mark_column_used(tmp_vfield, MARK_COLUMNS_WRITE);
// In order to update the new value, we have to read the old value
tmp_vfield->table->mark_column_used(tmp_vfield, MARK_COLUMNS_READ);
bitmap_updated = true;
}
}
} else // Insert needs to evaluate all generated columns
{
for (vfield_ptr = vfield; *vfield_ptr; vfield_ptr++) {
tmp_vfield = *vfield_ptr;
DBUG_ASSERT(tmp_vfield->gcol_info && tmp_vfield->gcol_info->expr_item);
tmp_vfield->table->mark_column_used(tmp_vfield, MARK_COLUMNS_WRITE);
bitmap_updated = true;
}
}
if (bitmap_updated) file->column_bitmaps_signal();
}
/*
Update the read_map with columns needed for check constraint evaluation when
doing update and insert operations.
The read_map is filled with the base columns and generated columns to be read
to evaluate check constraints. Prerequisites for UPDATE is, write_map is
filled with the base columns to be updated and generated columns that are
dependent on updated base columns.
@param is_update true means the operation is UPDATE.
false means it's INSERT.
@return void
*/
void TABLE::mark_check_constraint_columns(bool is_update) {
DBUG_ASSERT(table_check_constraint_list != nullptr);
bool bitmap_updated = false;
for (Sql_table_check_constraint *tbl_cc : *table_check_constraint_list) {
if (tbl_cc->is_enforced()) {
/*
For update operation, check constraint should be evaluated if it is
dependent on any of the updated column.
*/
if (is_update &&
!bitmap_is_overlapping(write_set,
&tbl_cc->value_generator()->base_columns_map))
continue;
// Mark all the columns used in the check constraint.
const MY_BITMAP *columns_map =
&tbl_cc->value_generator()->base_columns_map;
for (uint i = bitmap_get_first_set(columns_map); i != MY_BIT_NONE;
i = bitmap_get_next_set(columns_map, i)) {
DBUG_ASSERT(i < s->fields);
mark_column_used(field[i], MARK_COLUMNS_READ);
}
bitmap_updated = true;
}
}
if (bitmap_updated) file->column_bitmaps_signal();
}
/**
Cleanup this table for re-execution.
*/
void TABLE_LIST::reinit_before_use(THD *thd) {
/*
Reset old pointers to TABLEs: they are not valid since the tables
were closed in the end of previous prepare or execute call.
*/
table = 0;
/*
Reset table_name and table_name_length for schema table.
They are not valid as TABLEs were closed in the end of previous prepare
or execute call.
*/
if (schema_table_name) {
table_name = schema_table_name;
table_name_length = strlen(schema_table_name);
}
/* Reset is_schema_table_processed value(needed for I_S tables */
schema_table_state = NOT_PROCESSED;
mdl_request.ticket = NULL;
if (is_recursive_reference() && select_lex)
set_derived_unit(select_lex->recursive_dummy_unit);
/*
Is this table part of a SECURITY DEFINER VIEW?
*/
if (!prelocking_placeholder && view && view_suid && view_sctx) {
/*
The suid view needs to "login" again at this stage before privilege
precheck is done. The THD::m_view_ctx list is used to keep track of the
new authorized security context life time. When the THD is reset or
destroyed the security context is safely logged out and and any Acl_maps
returned to the Acl cache.
*/
prepare_view_security_context(thd);
thd->m_view_ctx_list.push_back(view_sctx);
}
}
uint TABLE_LIST::query_block_id() const {
if (!derived) return 0;
return derived->first_select()->select_number;
}
uint TABLE_LIST::query_block_id_for_explain() const {
if (!derived) return 0;
if (!m_common_table_expr || !m_common_table_expr->tmp_tables.size())
return derived->first_select()->select_number;
return m_common_table_expr->tmp_tables[0]
->derived_unit()
->first_select()
->select_number;
}
/**
Compiles the tagged hints list and fills up the bitmasks.
@param thd The current session.
@param tbl the TABLE to operate on.
The parser collects the index hints for each table in a "tagged list"
(TABLE_LIST::index_hints). Using the information in this tagged list
this function sets the members st_table::keys_in_use_for_query,
st_table::keys_in_use_for_group_by, st_table::keys_in_use_for_order_by,
st_table::force_index, st_table::force_index_order,
st_table::force_index_group and st_table::covering_keys.
Current implementation of the runtime does not allow mixing FORCE INDEX
and USE INDEX, so this is checked here. Then the FORCE INDEX list
(if non-empty) is appended to the USE INDEX list and a flag is set.
Multiple hints of the same kind are processed so that each clause
is applied to what is computed in the previous clause.
For example:
USE INDEX (i1) USE INDEX (i2)
is equivalent to
USE INDEX (i1,i2)
and means "consider only i1 and i2".
Similarly
USE INDEX () USE INDEX (i1)
is equivalent to
USE INDEX (i1)
and means "consider only the index i1"
It is OK to have the same index several times, e.g. "USE INDEX (i1,i1)" is
not an error.
Different kind of hints (USE/FORCE/IGNORE) are processed in the following
order:
1. All indexes in USE (or FORCE) INDEX are added to the mask.
2. All IGNORE INDEX
e.g. "USE INDEX i1, IGNORE INDEX i1, USE INDEX i1" will not use i1 at all
as if we had "USE INDEX i1, USE INDEX i1, IGNORE INDEX i1".
@retval false No errors found.
@retval true Found and reported an error.
*/
bool TABLE_LIST::process_index_hints(const THD *thd, TABLE *tbl) {
/* initialize the result variables */
tbl->keys_in_use_for_query = tbl->keys_in_use_for_group_by =
tbl->keys_in_use_for_order_by = tbl->s->usable_indexes(thd);
/* index hint list processing */
if (index_hints) {
/* Temporary variables used to collect hints of each kind. */
Key_map index_join[INDEX_HINT_FORCE + 1];
Key_map index_order[INDEX_HINT_FORCE + 1];
Key_map index_group[INDEX_HINT_FORCE + 1];
Index_hint *hint;
bool have_empty_use_join = false, have_empty_use_order = false,
have_empty_use_group = false;
List_iterator<Index_hint> iter(*index_hints);
/* iterate over the hints list */
while ((hint = iter++)) {
uint pos;
/* process empty USE INDEX () */
if (hint->type == INDEX_HINT_USE && !hint->key_name.str) {
if (hint->clause & INDEX_HINT_MASK_JOIN) {
index_join[hint->type].clear_all();
have_empty_use_join = true;
}
if (hint->clause & INDEX_HINT_MASK_ORDER) {
index_order[hint->type].clear_all();
have_empty_use_order = true;
}
if (hint->clause & INDEX_HINT_MASK_GROUP) {
index_group[hint->type].clear_all();
have_empty_use_group = true;
}
continue;
}
/*
Check if an index with the given name exists and get his offset in
the keys bitmask for the table
*/
if (tbl->s->keynames.type_names == 0 ||
(pos = find_type(&tbl->s->keynames, hint->key_name.str,
hint->key_name.length, 1)) <= 0 ||
!tbl->s->key_info[pos - 1].is_visible) {
my_error(ER_KEY_DOES_NOT_EXITS, MYF(0), hint->key_name.str, alias);
return 1;
}
pos--;
/* add to the appropriate clause mask */
if (hint->clause & INDEX_HINT_MASK_JOIN)
index_join[hint->type].set_bit(pos);
if (hint->clause & INDEX_HINT_MASK_ORDER)
index_order[hint->type].set_bit(pos);
if (hint->clause & INDEX_HINT_MASK_GROUP)
index_group[hint->type].set_bit(pos);
}
/* cannot mix USE INDEX and FORCE INDEX */
if ((!index_join[INDEX_HINT_FORCE].is_clear_all() ||
!index_order[INDEX_HINT_FORCE].is_clear_all() ||
!index_group[INDEX_HINT_FORCE].is_clear_all()) &&
(!index_join[INDEX_HINT_USE].is_clear_all() || have_empty_use_join ||
!index_order[INDEX_HINT_USE].is_clear_all() || have_empty_use_order ||
!index_group[INDEX_HINT_USE].is_clear_all() || have_empty_use_group)) {
my_error(ER_WRONG_USAGE, MYF(0), index_hint_type_name[INDEX_HINT_USE],
index_hint_type_name[INDEX_HINT_FORCE]);
return 1;
}
/* process FORCE INDEX as USE INDEX with a flag */
if (!index_order[INDEX_HINT_FORCE].is_clear_all()) {
tbl->force_index_order = true;
index_order[INDEX_HINT_USE].merge(index_order[INDEX_HINT_FORCE]);
}
if (!index_group[INDEX_HINT_FORCE].is_clear_all()) {
tbl->force_index_group = true;
index_group[INDEX_HINT_USE].merge(index_group[INDEX_HINT_FORCE]);
}
/*
TODO: get rid of tbl->force_index (on if any FORCE INDEX is specified) and
create tbl->force_index_join instead.
Then use the correct force_index_XX instead of the global one.
*/
if (!index_join[INDEX_HINT_FORCE].is_clear_all() ||
tbl->force_index_group || tbl->force_index_order) {
tbl->force_index = true;
index_join[INDEX_HINT_USE].merge(index_join[INDEX_HINT_FORCE]);
}
/* apply USE INDEX */
if (!index_join[INDEX_HINT_USE].is_clear_all() || have_empty_use_join)
tbl->keys_in_use_for_query.intersect(index_join[INDEX_HINT_USE]);
if (!index_order[INDEX_HINT_USE].is_clear_all() || have_empty_use_order)
tbl->keys_in_use_for_order_by.intersect(index_order[INDEX_HINT_USE]);
if (!index_group[INDEX_HINT_USE].is_clear_all() || have_empty_use_group)
tbl->keys_in_use_for_group_by.intersect(index_group[INDEX_HINT_USE]);
/* apply IGNORE INDEX */
tbl->keys_in_use_for_query.subtract(index_join[INDEX_HINT_IGNORE]);
tbl->keys_in_use_for_order_by.subtract(index_order[INDEX_HINT_IGNORE]);
tbl->keys_in_use_for_group_by.subtract(index_group[INDEX_HINT_IGNORE]);
}
/* make sure covering_keys don't include indexes disabled with a hint */
tbl->covering_keys.intersect(tbl->keys_in_use_for_query);
return 0;
}
/**
Helper function which allows to allocate metadata lock request
objects for all elements of table list.
*/
void init_mdl_requests(TABLE_LIST *table_list) {
for (; table_list; table_list = table_list->next_global)
MDL_REQUEST_INIT(&table_list->mdl_request, MDL_key::TABLE, table_list->db,
table_list->table_name,
mdl_type_for_dml(table_list->lock_descriptor().type),
MDL_TRANSACTION);
}
/**
@returns true if view or derived table is mergeable, based on
technical constraints.
*/
bool TABLE_LIST::is_mergeable() const {
return is_view_or_derived() && algorithm != VIEW_ALGORITHM_TEMPTABLE &&
derived->is_mergeable();
}
bool TABLE_LIST::materializable_is_const() const {
DBUG_ASSERT(uses_materialization());
const SELECT_LEX_UNIT *unit = derived_unit();
return unit->query_result()->estimated_rowcount <= 1 &&
(unit->first_select()->active_options() &
OPTION_NO_SUBQUERY_DURING_OPTIMIZATION) == 0;
}
/**
Return the number of leaf tables for a merged view.
*/
uint TABLE_LIST::leaf_tables_count() const {
// Join nests are not permissible, except as merged views
DBUG_ASSERT(nested_join == NULL || is_merged());
if (!is_merged()) // Base table or materialized view
return 1;
uint count = 0;
for (TABLE_LIST *tbl = merge_underlying_list; tbl; tbl = tbl->next_local)
count += tbl->leaf_tables_count();
return count;
}
/**
@brief
Retrieve number of rows in the table
@details
Retrieve number of rows in the table referred by this TABLE_LIST and
store it in the table's stats.records variable. If this TABLE_LIST refers
to a materialized derived table/view, then the estimated number of rows of
the derived table/view is used instead.
@return 0 ok
@return non zero error
*/
int TABLE_LIST::fetch_number_of_rows() {
int error = 0;
if (is_table_function()) {
// FIXME: open question - there's no estimate for table function.
// return arbitrary, non-zero number;
table->file->stats.records = PLACEHOLDER_TABLE_ROW_ESTIMATE;
} else if (uses_materialization()) {
/*
@todo: CostModel: This updates the stats.record value to the
estimated number of records. This number is used when estimating
the cost of a table scan for a heap table (ie. it helps producing
a reasonable good cost estimate for heap tables). If the materialized
table is stored in MyISAM, this number is not used in the cost estimate
for table scan. The table scan cost for MyISAM thus always becomes
the estimate for an empty table.
*/
table->file->stats.records = derived->query_result()->estimated_rowcount;
} else if (is_recursive_reference()) {
/*
Use the estimated row count of all query blocks before this one, as the
table will contain, at least, the rows produced by those blocks.
*/
table->file->stats.records =
std::max(select_lex->master_unit()->query_result()->estimated_rowcount,
// Recursive reference is never a const table
(ha_rows)PLACEHOLDER_TABLE_ROW_ESTIMATE);
} else
error = table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK);
return error;
}
/**
A helper function to add a derived key to the list of possible keys
@param derived_key_list list of all possible derived keys
@param field referenced field
@param ref_by_tbl the table that refers to given field
@details The possible key to be used for join with table with ref_by_tbl
table map is extended to include 'field'. If ref_by_tbl == 0 then the key
that includes all referred fields is extended.
@note
Procedure of keys generation for result tables of materialized derived
tables/views for allowing ref access to them.
A key is generated for each equi-join pair (derived table, another table).
Each generated key consists of fields of derived table used in equi-join.
Example:
SELECT * FROM (SELECT f1, f2, count(*) FROM t1 GROUP BY f1) tt JOIN
t1 ON tt.f1=t1.f3 and tt.f2=t1.f4;
In this case for the derived table tt one key will be generated. It will
consist of two parts f1 and f2.
Example:
SELECT * FROM (SELECT f1, f2, count(*) FROM t1 GROUP BY f1) tt JOIN
t1 ON tt.f1=t1.f3 JOIN
t2 ON tt.f2=t2.f4;
In this case for the derived table tt two keys will be generated.
One key over f1 field, and another key over f2 field.
Currently optimizer may choose to use only one such key, thus the second
one will be dropped after the range optimizer is finished.
See also JOIN::finalize_derived_keys function.
Example:
SELECT * FROM (SELECT f1, f2, count(*) FROM t1 GROUP BY f1) tt JOIN
t1 ON tt.f1=a_function(t1.f3);
In this case for the derived table tt one key will be generated. It will
consist of one field - f1.
In all cases beside one-per-table keys one additional key is generated.
It includes all fields referenced by other tables.
Implementation is split in three steps:
gather information on all used fields of derived tables/view and
store it in lists of possible keys, one per a derived table/view.
add keys to result tables of derived tables/view using info from above
lists.
(...Planner selects best key...)
drop unused keys from the table.
The above procedure is implemented in 4 functions:
TABLE_LIST::update_derived_keys
Create/extend list of possible keys for one derived
table/view based on given field/used tables info.
(Step one)
JOIN::generate_derived_keys
This function is called from update_ref_and_keys
when all possible info on keys is gathered and it's
safe to add keys - no keys or key parts would be
missed. Walk over list of derived tables/views and
call to TABLE_LIST::generate_keys to actually
generate keys. (Step two)
TABLE_LIST::generate_keys
Walks over list of possible keys for this derived
table/view to add keys to the result table.
Calls to TABLE::add_tmp_key to actually add
keys (i.e. KEY objects in TABLE::key_info). (Step two)
TABLE::add_tmp_key Creates one index description according to given
bitmap of used fields. (Step two)
[ Planner runs and possibly chooses one key, stored in Key_use->key ]
JOIN::finalize_derived_keys Walk over list of derived tables/views to
destroy unused keys. (Step three)
This design is used for derived tables, views and CTEs. As a CTE
can be multi-referenced, some points are worth noting:
1) Definitions
- let's call the CTE 'X'
- Key creation/deletion happens in a window between the start of
update_derived_keys() and the end of finalize_derived_keys().
2) Key array locking
- Evaluation of constant subqueries (and thus their optimization)
may happen either before, inside, or after the window above:
* an example of "before": WHERE 1=(subq)), due to optimize_cond()
* an example of "inside": WHERE col<>(subq), as make_join_plan()
calls estimate_rowcount() which calls the range optimizer for <>, which
evaluates subq
* an example of "after": WHERE key_col=(subq), due to
create_ref_for_key().
- let's say that a being-optimized query block 'QB1' is entering that
window; other query blocks are QB2, etc; let's say (subq) above is QB2, a
subquery of QB1.
- While QB1 is in this window, it is possible, as we saw above, that QB2
gets optimized. Because it is not safe to have two query blocks
reading/writing possible keys for a same table at the same time, a locking
mechanism is in place: TABLE_SHARE::owner_of_possible_tmp_keys is a record
of which query block entered first the window for this table and hasn't left
it yet; only that query block is allowed to read/write possible keys for
this table.
3) Key array growth
- let's say that a being-optimized query block 'QB1' is entering the
window; other query blocks are QB2 (not necessarily the same QB2 as in
previous paragraph), etc.
- let's call "local" the references to X in QB1, let's call "nonlocal" the
ones in other query blocks. For example,
with X(n) as (select 1)
select /+ QB_NAME(QB2) *_/ n from X as X2
where X2.n = (select /+* QB_NAME(QB1) *_/ X1.n from X as X1)
union
select n+2 from X as X3;
QB1 owns the window, then X1 is local, X2 and X3 are nonlocal.
- when QB1 enters the window, update_derived_keys() starts for the local
reference X1, other references to X may already have keys,
defined by previously optimized query blocks on their
references (e.g. QB2 on X2). At that stage the TABLE_SHARE::key_info array is
of size TABLE_SHARE::keys, and the TABLE_SHARE::first_unused_tmp_key member
points to 'where any new key should be added in this array', so it's equal
to TABLE_SHARE::keys. Let's call the keys defined by QB2 the "existing
keys": they exist at this point and will continue to do so. X2 in QB2 is
already set up to read with such key. Here's the key_info array, with cell 0
to the left, "E" meaning "an existing key, created by previous
optimizations", "-" meaning "an empty cell created by alloc_keys()".
EEEEEEEEEE-----------
^ s->first_unused_keys
^ s->keys
- generate_keys() extends the key_info array and adds "possible" keys to the
end. "Possible" is defined as "not yet existing", "might be dropped in the
end". Even if a possible key is a duplicate of an existing key, it is
added. TABLE_SHARE::keys is increased to include existing and possible
keys. All TABLEs referencing X, local or not, are kept in sync (i.e. any
possible key is added to all key_info arrays). But possible keys are set to
be unusable by nonlocal references, so that the decision to drop those keys
can be left to the window's owner. Key_info array now is ("P" means
"possible key"):
EEEEEEEEEEPPPPPPP---
^ s->first_unused_keys
^ s->keys
- All possible keys are unused, at this stage.
- Planner selects the best key for each local reference, among existing and
possible keys, it is recorded in Key_use.
- finalize_derived_keys() looks at local references, and gathers the list
of (existing and possible) keys which the Planner has chosen for them. We
call this list the list of locally-used keys, marked below with "!":
! ! !
EEEEEEEEEEPPPPPPP---
^ s->first_unused_keys
^ s->keys
- Any possible key which isn't locally-used is unnecessary.
- finalize_derived_keys() re-organizes the possible locally-used keys and
unnecessary keys, and does needed updates to TABLEs' bitmaps.
! !!
EEEEEEEEEEPPPPPPP---
^ s->first_unused_keys
^ s->keys
The locally-used keys become existing keys and are made visible to nonlocal
references. The unnecessary keys are chopped.
! !!
EEEEEEEEEEEE-----
^ s->first_unused_keys
^ s->keys
- After that, another query block can be optimized.
- So, query block after query block, optimization phases grow the key_info
array.
- If a reference is considered constant in a query block and the Optimizer
decides to evaluate it, this triggers materialization (creation in engine),
which freezes the key definition: other query blocks will not be allowed to
add keys.
@return true OOM
@return false otherwise
*/
static bool add_derived_key(List<Derived_key> &derived_key_list, Field *field,
table_map ref_by_tbl) {
uint key = 0;
Derived_key *entry = 0;
List_iterator<Derived_key> ki(derived_key_list);
/* Search for already existing possible key. */
while ((entry = ki++)) {
key++;
if (ref_by_tbl) {
/* Search for the entry for the specified table.*/
if (entry->referenced_by & ref_by_tbl) break;
} else {
/*
Search for the special entry that should contain fields referred
from any table.
*/
if (!entry->referenced_by) break;
}
}
/* Add new possible key if nothing is found. */
if (!entry) {
THD *thd = field->table->in_use;
key++;
entry = new (thd->mem_root) Derived_key();
if (!entry) return true;
entry->referenced_by = ref_by_tbl;
entry->used_fields.clear_all();
if (derived_key_list.push_back(entry, thd->mem_root)) return true;
}
/* Don't create keys longer than REF access can use. */
if (entry->used_fields.bits_set() < MAX_REF_PARTS) {
field->part_of_key.set_bit(key - 1);
field->flags |= PART_KEY_FLAG;
entry->used_fields.set_bit(field->field_index);
}
return false;
}
/*
@brief
Update derived table's list of possible keys
@param thd session context
@param field derived table's field to take part in a key
@param values array of values. Each value combined with "field"
forms an equality predicate.
@param num_values number of elements in the array values
@param[out] allocated true if key was allocated, false if unsupported
@details
This function creates/extends a list of possible keys for this derived
table/view. For each table used by a value from the 'values' array the
corresponding possible key is extended to include the 'field'.
If there is no such possible key, then it is created. field's
part_of_key bitmaps are updated accordingly.
@see add_derived_key
@returns false if success, true if error
*/
bool TABLE_LIST::update_derived_keys(THD *thd, Field *field, Item **values,
uint num_values, bool *allocated) {
*allocated = false;
/*
Don't bother with keys for CREATE VIEW, BLOB fields and fields with
zero length.
*/
if (thd->lex->is_ps_or_view_context_analysis() || field->flags & BLOB_FLAG ||
field->field_length == 0)
return false;
const Sql_cmd *const cmd = thd->lex->m_sql_cmd;
// Secondary storage engines do not support use of indexes on derived tables
if (cmd != nullptr && cmd->using_secondary_storage_engine()) return false;
/* Allow all keys to be used. */
if (derived_key_list.elements == 0) table->keys_in_use_for_query.set_all();
for (uint i = 0; i < num_values; i++) {
table_map tables = values[i]->used_tables() & ~PSEUDO_TABLE_BITS;
if (!tables || values[i]->real_item()->type() != Item::FIELD_ITEM) continue;
for (table_map tbl = 1; tables >= tbl; tbl <<= 1) {
if (!(tables & tbl)) continue;
if (add_derived_key(derived_key_list, field, tbl)) return true;
}
}
/* Extend key which includes all referenced fields. */
if (add_derived_key(derived_key_list, field, (table_map)0)) return true;
*allocated = true;
return false;
}
/*
Comparison function for Derived_key entries.
See TABLE_LIST::generate_keys.
*/
static int Derived_key_comp(Derived_key *e1, Derived_key *e2) {
/* Move entries for tables with greater table bit to the end. */
return ((e1->referenced_by < e2->referenced_by)
? -1
: ((e1->referenced_by > e2->referenced_by) ? 1 : 0));
}
/**
@brief
Generate keys for a materialized derived table/view.
@details
This function adds keys to the result table by walking over the list of
possible keys for this derived table/view and calling the
TABLE::add_tmp_key to actually add keys. A name @<auto_keyN@>, where N is a
sequential number, is given to each key to ease debugging.
@see add_derived_key
@return true an error occur.
@return false all keys were successfully added.
*/
bool TABLE_LIST::generate_keys() {
DBUG_ASSERT(uses_materialization());
if (!derived_key_list.elements) return false;
Derived_refs_iterator ref_it(this);
while (TABLE *t = ref_it.get_next())
if (t->is_created()) {
/*
The table may have been instantiated already, by another query
block. Consider:
with qn as (...) select * from qn where a=(select * from qn)
union select * from qn where b=3;
Then the scalar subquery is non-correlated, and cache-able, so the
optimization phase of the first UNION member evaluates this subquery,
which instantiates qn, then this phase may want to add an index on 'a'
(for 'a=') but it's too late. Or the upcoming optimization phase for
the second UNION member may want to add an index on 'b'.
*/
return false;
}
if (table->s->owner_of_possible_tmp_keys != nullptr &&
table->s->owner_of_possible_tmp_keys != select_lex)
return false;
// Extend the key array of every reference
const int new_key_count =
std::min(table->s->keys + derived_key_list.elements, MAX_INDEXES);
ref_it.rewind();
while (TABLE *t = ref_it.get_next())
if (t->alloc_tmp_keys(new_key_count, ref_it.is_first()))
return true; /* purecov: inspected */
/* Sort entries to make key numbers sequence deterministic. */
derived_key_list.sort(Derived_key_comp);
List_iterator<Derived_key> it(derived_key_list);
Derived_key *entry;
char buf[NAME_CHAR_LEN];
while ((entry = it++)) {
if (table->s->keys == MAX_INDEXES)
break; // Impossible to create more keys.
sprintf(buf, "<auto_key%d>", table->s->keys);
char *name_buf = table->in_use->mem_strdup(buf);
ref_it.rewind();
while (TABLE *t = ref_it.get_next()) {
if (t->add_tmp_key(&entry->used_fields, name_buf,
t->pos_in_table_list->select_lex != select_lex,
ref_it.is_first()))
return true; /* purecov: inspected */
}
}
if (table->s->keys)
table->s->owner_of_possible_tmp_keys = select_lex; // Acquire lock
return false;
}
/**
Update TABLE::const_key_parts for single table UPDATE/DELETE query
@param conds WHERE clause expression
@retval true error (OOM)
@retval false success
@note
Set const_key_parts bits if key fields are equal to constants in
the WHERE expression.
*/
bool TABLE::update_const_key_parts(Item *conds) {
memset(const_key_parts, 0, sizeof(key_part_map) * s->keys);
if (conds == NULL) return false;
for (uint index = 0; index < s->keys; index++) {
KEY_PART_INFO *keyinfo = key_info[index].key_part;
KEY_PART_INFO *keyinfo_end =
keyinfo + key_info[index].user_defined_key_parts;
for (key_part_map part_map = (key_part_map)1; keyinfo < keyinfo_end;
keyinfo++, part_map <<= 1) {
if (const_expression_in_where(conds, NULL, keyinfo->field))
const_key_parts[index] |= part_map;
}
}
/*
Handle error for the whole function here instead of along with the call for
const_expression_in_where() as the function does not return true for errors.
*/
return this->in_use && this->in_use->is_error();
}
/**
Read removal is possible if the selected quick read
method is using full unique index
@see HA_READ_BEFORE_WRITE_REMOVAL
@param index Number of the index used for read
@retval true success, read removal started
@retval false read removal not started
*/
bool TABLE::check_read_removal(uint index) {
bool retval = false;
DBUG_TRACE;
DBUG_ASSERT(file->ha_table_flags() & HA_READ_BEFORE_WRITE_REMOVAL);
DBUG_ASSERT(index != MAX_KEY);
// Index must be unique
if ((key_info[index].flags & HA_NOSAME) == 0) return false;
// Full index must be used
bitmap_clear_all(&tmp_set);
mark_columns_used_by_index_no_reset(index, &tmp_set);
if (bitmap_cmp(&tmp_set, read_set)) {
// Start read removal in handler
retval = file->start_read_removal();
}
bitmap_clear_all(&tmp_set);
return retval;
}
/**
Test if the order list consists of simple field expressions
@param order Linked list of ORDER BY arguments
@return true if @a order is empty or consist of simple field expressions
*/
bool is_simple_order(ORDER *order) {
for (ORDER *ord = order; ord; ord = ord->next) {
if (ord->item[0]->real_item()->type() != Item::FIELD_ITEM) return false;
}
return true;
}
/**
Repoint a table's fields from old_rec to new_rec
@param table the table of fields needed to be repointed
@param old_rec the original record buffer fields point to
@param new_rec the target record buff fields need to repoint
*/
void repoint_field_to_record(TABLE *table, uchar *old_rec, uchar *new_rec) {
Field **fields = table->field;
ptrdiff_t ptrdiff = new_rec - old_rec;
for (uint i = 0; i < table->s->fields; i++)
fields[i]->move_field_offset(ptrdiff);
}
/**
Evaluate necessary virtual generated columns.
This is used right after reading a row from the storage engine.
@note this is not necessary for stored generated columns, as they are
provided by the storage engine.
@param [in,out] buf the buffer to store data
@param table the TABLE object
@param active_index the number of key for index scan (MAX_KEY is default)
@return true if error.
@todo see below for potential conflict with Bug#21815348 .
*/
bool update_generated_read_fields(uchar *buf, TABLE *table, uint active_index) {
DBUG_TRACE;
DBUG_ASSERT(table && table->vfield);
if (table->in_use->is_error()) return true;
if (active_index != MAX_KEY && table->key_read) {
/*
The covering index is providing all necessary columns, including
generated ones.
Note that this logic may have to be reconsidered when we fix
Bug#21815348; indeed, for that bug it could be possible to implement the
following optimization: if A is an indexed base column, and B is a
virtual generated column dependent on A, "select B from t" could choose
an index-only scan over the index of A and calculate values of B on the
fly. In that case, we would come here, however calculation of B would
still be needed.
Currently MySQL doesn't choose an index scan in that case because it
considers B as independent from A, in its index-scan decision logic.
*/
return false;
}
int error = 0;
/*
If the buffer storing the record data is not record[0], then the field
objects must be temporarily changed to point into the supplied buffer.
The field pointers are restored at the end of this function.
*/
if (buf != table->record[0])
repoint_field_to_record(table, table->record[0], buf);
for (Field **vfield_ptr = table->vfield; *vfield_ptr; vfield_ptr++) {
Field *vfield = *vfield_ptr;
DBUG_ASSERT(vfield->gcol_info && vfield->gcol_info->expr_item);
/*
Only calculate those virtual generated fields that are marked in the
read_set bitmap.
*/
if (vfield->is_virtual_gcol() &&
bitmap_is_set(table->read_set, vfield->field_index)) {
if (vfield->handle_old_value()) {
(down_cast<Field_blob *>(vfield))->keep_old_value();
(down_cast<Field_blob *>(vfield))->set_keep_old_value(true);
}
error = vfield->gcol_info->expr_item->save_in_field(vfield, 0);
DBUG_PRINT("info", ("field '%s' - updated", vfield->field_name));
if (error && !table->in_use->is_error()) {
/*
Most likely a calculation error which only triggered a warning, so
let's not make the read fail.
*/
error = 0;
}
} else {
DBUG_PRINT("info", ("field '%s' - skipped", vfield->field_name));
}
}
if (buf != table->record[0])
repoint_field_to_record(table, buf, table->record[0]);
return error != 0;
/*
@todo
this function is used by ha_rnd/etc, those ha_* functions are expected to
return 0 or a HA_ERR code (and such codes are picked up by
handler::print_error), but update_generated_read_fields returns true/false
(0/1), which is then returned by the ha_* functions. If it
returns 1 we get:
ERROR 1030 (HY000): Got error 1 from storage engine
which isn't informative for the user.
*/
}
/**
Calculate data for each generated field marked for write in the
corresponding column map.
@note We need calculate data for both virtual and stored generated
fields.
@param bitmap Bitmap over fields to update
@param table the TABLE object
@return
@retval
false - Success
@retval
true - Error occurred during the generation/calculation of a generated
field value
*/
bool update_generated_write_fields(const MY_BITMAP *bitmap, TABLE *table) {
DBUG_TRACE;
Field **field_ptr;
int error = 0;
if (table->in_use->is_error()) return true;
if (table->vfield) {
/* Iterate over generated fields in the table */
for (field_ptr = table->vfield; *field_ptr; field_ptr++) {
Field *vfield;
vfield = (*field_ptr);
DBUG_ASSERT(vfield->gcol_info && vfield->gcol_info->expr_item);
/* Only update those fields that are marked in the bitmap */
if (bitmap_is_set(bitmap, vfield->field_index)) {
/*
For a virtual generated column of blob type, we have to keep
the current blob value since this might be needed by the
storage engine during updates.
All arrays are BLOB fields.
*/
if (vfield->handle_old_value()) {
(down_cast<Field_blob *>(vfield))->keep_old_value();
(down_cast<Field_blob *>(vfield))->set_keep_old_value(true);
}
/* Generate the actual value of the generated fields */
error = vfield->gcol_info->expr_item->save_in_field(vfield, 0);
DBUG_PRINT("info", ("field '%s' - updated", vfield->field_name));
if (error && !table->in_use->is_error()) error = 0;
if (table->fields_set_during_insert)
bitmap_set_bit(table->fields_set_during_insert, vfield->field_index);
} else {
DBUG_PRINT("info", ("field '%s' - skipped", vfield->field_name));
}
}
}
if (error > 0) return true;
return false;
}
/**
Adds a generated column and its dependencies to the read_set/write_set
bitmaps.
If the value of a generated column (gcol) must be calculated, it needs to
be in write_set (to satisfy the assertion in Field::store); the value of
its underlying base columns is necessary to the calculation so those must
be in read_set.
A gcol must be calculated in two cases:
- we're sending the gcol to the engine
- the gcol is virtual and we're reading it from the engine without using a
covering index on it.
*/
void TABLE::mark_gcol_in_maps(Field *field) {
bitmap_set_bit(write_set, field->field_index);
/*
Typed array fields internally are using a conversion field, it needs to
marked as readable in order to do conversions.
*/
if (field->is_array()) bitmap_set_bit(read_set, field->field_index);
/*
Note that underlying base columns are here added to read_set but not added
to requirements for an index to be covering (covering_keys is not touched).
So, if we have:
SELECT gcol FROM t :
- an index covering gcol only (not including base columns), can still be
chosen by the optimizer; note that InnoDB's build_template_needs_field()
properly ignores read_set when MySQL asks for "index only" reads
(table->key_read == true); if it didn't, it would do useless reads.
- but if gcol is not read from an index, we will read base columns because
they are in read_set.
- Note how this relies on InnoDB's behaviour.
*/
for (uint i = 0; i < s->fields; i++) {
if (bitmap_is_set(&field->gcol_info->base_columns_map, i)) {
bitmap_set_bit(read_set, i);
if (this->field[i]->is_virtual_gcol()) bitmap_set_bit(write_set, i);
}
}
}
void TABLE::column_bitmaps_set(MY_BITMAP *read_set_arg,
MY_BITMAP *write_set_arg) {
read_set = read_set_arg;
write_set = write_set_arg;
if (file && created) file->column_bitmaps_signal();
}
bool TABLE_LIST::set_recursive_reference() {
if (select_lex->recursive_reference != nullptr) return true;
select_lex->recursive_reference = this;
m_is_recursive_reference = true;
return false;
}
/**
Propagate table map of a table up by nested join tree. Used to check
dependencies for LATERAL JOIN of table functions.
simplify_joins() calculates the same information but also does
transformations, and we need this semantic check to be earlier than
simplify_joins() and before transformations.
@param map_arg table map to propagate
*/
void TABLE_LIST::propagate_table_maps(table_map map_arg) {
table_map prop_map;
if (nested_join) {
nested_join->used_tables |= map_arg;
prop_map = nested_join->used_tables;
} else
prop_map = map();
if (embedding) embedding->propagate_table_maps(prop_map);
}
LEX_USER *LEX_USER::alloc(THD *thd, LEX_STRING *user_arg,
LEX_STRING *host_arg) {
LEX_USER *ret = static_cast<LEX_USER *>(thd->alloc(sizeof(LEX_USER)));
if (ret == NULL) return NULL;
/*
Trim whitespace as the values will go to a CHAR field
when stored.
*/
trim_whitespace(system_charset_info, user_arg);
if (host_arg) trim_whitespace(system_charset_info, host_arg);
ret->user.str = user_arg->str;
ret->user.length = user_arg->length;
ret->host.str = host_arg ? host_arg->str : "%";
ret->host.length = host_arg ? host_arg->length : 1;
ret->plugin = EMPTY_CSTR;
ret->auth = NULL_CSTR;
ret->current_auth = NULL_CSTR;
ret->uses_replace_clause = false;
ret->uses_identified_by_clause = false;
ret->uses_identified_with_clause = false;
ret->uses_authentication_string_clause = false;
ret->has_password_generator = false;
ret->retain_current_password = false;
ret->discard_old_password = false;
ret->alter_status.account_locked = false;
ret->alter_status.expire_after_days = 0;
ret->alter_status.update_account_locked_column = false;
ret->alter_status.update_password_expired_column = false;
ret->alter_status.update_password_expired_fields = false;
ret->alter_status.use_default_password_lifetime = true;
ret->alter_status.use_default_password_history = true;
ret->alter_status.update_password_require_current =
Lex_acl_attrib_udyn::UNCHANGED;
ret->alter_status.password_history_length = 0;
ret->alter_status.password_reuse_interval = 0;
if (check_string_char_length(ret->user, ER_THD(thd, ER_USERNAME),
USERNAME_CHAR_LENGTH, system_charset_info, 0) ||
(host_arg && check_host_name(ret->host)))
return NULL;
if (host_arg) {
/*
Convert hostname part of username to lowercase.
It's OK to use in-place lowercase as long as
the character set is utf8.
*/
my_casedn_str(system_charset_info, host_arg->str);
ret->host.str = host_arg->str;
}
return ret;
}
/**
A struct that contains execution time state used for partial update of JSON
columns.
*/
struct Partial_update_info {
Partial_update_info(const TABLE *table, const MY_BITMAP *columns,
bool logical_diffs)
: m_binary_diff_vectors(table->in_use->mem_root, table->s->fields,
nullptr),
m_logical_diff_vectors(table->in_use->mem_root,
logical_diffs ? table->s->fields : 0, nullptr) {
MEM_ROOT *const mem_root = table->in_use->mem_root;
const size_t bitmap_size = table->s->column_bitmap_size;
auto buffer = static_cast<my_bitmap_map *>(mem_root->Alloc(bitmap_size));
if (buffer != nullptr) {
bitmap_init(&m_enabled_binary_diff_columns, buffer, table->s->fields,
false);
bitmap_copy(&m_enabled_binary_diff_columns, columns);
}
buffer = static_cast<my_bitmap_map *>(mem_root->Alloc(bitmap_size));
if (buffer != nullptr) {
bitmap_init(&m_enabled_logical_diff_columns, buffer, table->s->fields,
false);
if (logical_diffs)
bitmap_copy(&m_enabled_logical_diff_columns, columns);
else
bitmap_clear_all(&m_enabled_logical_diff_columns);
}
for (uint i = bitmap_get_first_set(columns); i != MY_BIT_NONE;
i = bitmap_get_next_set(columns, i)) {
m_binary_diff_vectors[i] = new (mem_root) Binary_diff_vector(mem_root);
if (logical_diffs) {
Json_diff_vector::allocator_type alloc(mem_root);
m_logical_diff_vectors[i] = new (mem_root) Json_diff_vector(alloc);
}
}
}
~Partial_update_info() {
for (auto v : m_logical_diff_vectors) destroy(v);
}
/**
The columns for which partial update using binary diffs is enabled
in the current row.
*/
MY_BITMAP m_enabled_binary_diff_columns;
/**
The columns for which partial update using logical JSON diffs is
enabled in the current row.
*/
MY_BITMAP m_enabled_logical_diff_columns;
/**
The binary diffs that have been collected for the current row.
The Binary_diff_vector objects live entirely in a MEM_ROOT, so
there is no need to destroy them when this object is destroyed.
*/
Mem_root_array<Binary_diff_vector *> m_binary_diff_vectors;
/**
The logical diffs that have been collected for JSON operations in
the current row.
Whereas the Json_diff_vector objects live in a MEM_ROOT and their
memory will be reclaimed automatically, the Json_diff objects
within them can own memory allocated on the heap, so they will
have to be destroyed when this object is destroyed.
*/
Mem_root_array<Json_diff_vector *> m_logical_diff_vectors;
/**
A buffer that can be used to hold the partially updated column value while
performing the update in memory.
*/
String m_buffer;
/// Should logical JSON diffs be collected in addition to binary diffs?
bool collect_logical_diffs() const {
/*
We only allocate logical diff vectors when we want logical diffs
to be collected, so check if we have any.
*/
return !m_logical_diff_vectors.empty();
}
};
bool TABLE::mark_column_for_partial_update(const Field *field) {
DBUG_ASSERT(field->table == this);
if (m_partial_update_columns == nullptr) {
MY_BITMAP *map = new (&mem_root) MY_BITMAP;
my_bitmap_map *buf =
static_cast<my_bitmap_map *>(mem_root.Alloc(s->column_bitmap_size));
if (map == nullptr || buf == nullptr ||
bitmap_init(map, buf, s->fields, false))
return true; /* purecov: inspected */
m_partial_update_columns = map;
}
bitmap_set_bit(m_partial_update_columns, field->field_index);
return false;
}
void TABLE::disable_binary_diffs_for_current_row(const Field *field) {
DBUG_ASSERT(field->table == this);
DBUG_ASSERT(is_binary_diff_enabled(field));
// Remove the diffs collected for the column.
m_partial_update_info->m_binary_diff_vectors[field->field_index]->clear();
// Mark the column as disabled.
bitmap_clear_bit(&m_partial_update_info->m_enabled_binary_diff_columns,
field->field_index);
}
bool TABLE::is_marked_for_partial_update(const Field *field) const {
DBUG_ASSERT(field->table == this);
return m_partial_update_columns != nullptr &&
bitmap_is_set(m_partial_update_columns, field->field_index);
}
bool TABLE::has_binary_diff_columns() const {
return m_partial_update_info != nullptr &&
!bitmap_is_clear_all(
&m_partial_update_info->m_enabled_binary_diff_columns);
}
bool TABLE::setup_partial_update(bool logical_diffs) {
DBUG_TRACE;
DBUG_ASSERT(m_partial_update_info == nullptr);
if (!has_columns_marked_for_partial_update()) return false;
Opt_trace_context *trace = &in_use->opt_trace;
if (trace->is_started()) {
Opt_trace_object trace_wrapper(trace);
Opt_trace_object trace_partial_update(trace, "json_partial_update");
trace_partial_update.add_utf8_table(pos_in_table_list);
Opt_trace_array columns(trace, "eligible_columns");
for (uint i = bitmap_get_first_set(m_partial_update_columns);
i != MY_BIT_NONE;
i = bitmap_get_next_set(m_partial_update_columns, i)) {
columns.add_utf8(s->field[i]->field_name);
}
}
m_partial_update_info = new (in_use->mem_root)
Partial_update_info(this, m_partial_update_columns, logical_diffs);
return in_use->is_error();
}
bool TABLE::setup_partial_update() {
bool logical_diffs = (in_use->variables.binlog_row_value_options &
PARTIAL_JSON_UPDATES) != 0 &&
mysql_bin_log.is_open() &&
(in_use->variables.option_bits & OPTION_BIN_LOG) != 0 &&
log_bin_use_v1_row_events == 0 &&
in_use->is_current_stmt_binlog_format_row();
DBUG_PRINT(
"info",
("TABLE::setup_partial_update(): logical_diffs=%d "
"because binlog_row_value_options=%d binlog.is_open=%d "
"sql_log_bin=%d use_v1_row_events=%d rbr=%d",
logical_diffs,
(in_use->variables.binlog_row_value_options & PARTIAL_JSON_UPDATES) != 0,
mysql_bin_log.is_open(),
(in_use->variables.option_bits & OPTION_BIN_LOG) != 0,
log_bin_use_v1_row_events, in_use->is_current_stmt_binlog_format_row()));
return setup_partial_update(logical_diffs);
}
bool TABLE::has_columns_marked_for_partial_update() const {
/*
Do we have any columns that satisfy the syntactical requirements for
partial update?
*/
return m_partial_update_columns != nullptr &&
!bitmap_is_clear_all(m_partial_update_columns);
}
void TABLE::cleanup_partial_update() {
DBUG_TRACE;
destroy(m_partial_update_info);
m_partial_update_info = nullptr;
}
String *TABLE::get_partial_update_buffer() {
DBUG_ASSERT(m_partial_update_info != nullptr);
return &m_partial_update_info->m_buffer;
}
void TABLE::clear_partial_update_diffs() {
DBUG_TRACE;
if (m_partial_update_info != nullptr) {
for (auto v : m_partial_update_info->m_binary_diff_vectors)
if (v != nullptr) v->clear();
bitmap_copy(&m_partial_update_info->m_enabled_binary_diff_columns,
m_partial_update_columns);
if (m_partial_update_info->collect_logical_diffs()) {
for (auto v : m_partial_update_info->m_logical_diff_vectors)
if (v != nullptr) v->clear();
bitmap_copy(&m_partial_update_info->m_enabled_logical_diff_columns,
m_partial_update_columns);
}
}
}
const Binary_diff_vector *TABLE::get_binary_diffs(const Field *field) const {
if (!is_binary_diff_enabled(field)) return nullptr;
return m_partial_update_info->m_binary_diff_vectors[field->field_index];
}
bool TABLE::add_binary_diff(const Field *field, size_t offset, size_t length) {
DBUG_ASSERT(is_binary_diff_enabled(field));
Binary_diff_vector *diffs =
m_partial_update_info->m_binary_diff_vectors[field->field_index];
/*
Find the first diff that does not end before the diff we want to insert.
That is, we find the first diff that is either overlapping with the diff we
want to insert, adjacent to the diff we want to insert, or comes after the
diff that we want to insert.
In the case of overlapping or adjacent diffs, we want to merge the diffs
rather than insert a new one.
*/
Binary_diff_vector::iterator first_it =
std::lower_bound(diffs->begin(), diffs->end(), offset,
[](const Binary_diff &diff, size_t start_offset) {
return diff.offset() + diff.length() < start_offset;
});
if (first_it != diffs->end() && first_it->offset() <= offset + length) {
/*
The diff we found was overlapping or adjacent, so we want to merge the
new diff with it. Find out if the new diff overlaps with or borders to
some of the diffs behind it. The call below finds the first diff after
first_it that is not overlapping with or adjacent to the new diff.
*/
Binary_diff_vector::const_iterator last_it =
std::upper_bound(first_it, diffs->end(), offset + length,
[](size_t end_offset, const Binary_diff &diff) {
return end_offset < diff.offset();
});
// First and last adjacent or overlapping diff. They can be the same one.
const Binary_diff &first_diff = *first_it;
const Binary_diff &last_diff = *(last_it - 1);
// Calculate the boundaries of the merged diff.
size_t beg = std::min(offset, first_diff.offset());
size_t end =
std::max(offset + length, last_diff.offset() + last_diff.length());
/*
Replace the first overlapping/adjacent diff with the merged diff, and
erase any subsequent diffs that are covered by the merged diff.
*/
*first_it = Binary_diff(beg, end - beg);
diffs->erase(first_it + 1, last_it);
return false;
}
/*
The new diff isn't overlapping with or adjacent to any of the existing
diffs. Just insert it.
*/
diffs->insert(first_it, Binary_diff(offset, length));
return false;
}
const char *Binary_diff::new_data(Field *field) const {
/*
Currently, partial update is only supported for JSON columns, so it's
safe to assume that the Field is in fact a Field_json.
*/
auto fld = down_cast<Field_json *>(field);
return fld->get_binary() + m_offset;
}
const char *Binary_diff::old_data(Field *field) const {
ptrdiff_t ptrdiff = field->table->record[1] - field->table->record[0];
field->move_field_offset(ptrdiff);
const char *data = new_data(field);
field->move_field_offset(-ptrdiff);
return data;
}
void TABLE::add_logical_diff(const Field_json *field,
const Json_seekable_path &path,
enum_json_diff_operation operation,
const Json_wrapper *new_value) {
DBUG_ASSERT(is_logical_diff_enabled(field));
Json_diff_vector *diffs =
m_partial_update_info->m_logical_diff_vectors[field->field_index];
if (new_value == nullptr)
diffs->add_diff(path, operation);
else {
diffs->add_diff(path, operation,
new_value->clone_dom(field->table->in_use));
}
#ifndef DBUG_OFF
StringBuffer<STRING_BUFFER_USUAL_SIZE> path_str;
StringBuffer<STRING_BUFFER_USUAL_SIZE> value_str;
if (diffs->at(diffs->size() - 1).path().to_string(&path_str))
path_str.length(0); /* purecov: inspected */
if (new_value == nullptr || new_value->type() == enum_json_type::J_ERROR)
value_str.set_ascii("<none>", 6);
else {
if (new_value->to_string(&value_str, false, "add_logical_diff"))
value_str.length(0); /* purecov: inspected */
}
DBUG_PRINT("info", ("add_logical_diff(operation=%d, path=%.*s, value=%.*s)",
(int)operation, (int)path_str.length(), path_str.ptr(),
(int)value_str.length(), value_str.ptr()));
#endif
}
const Json_diff_vector *TABLE::get_logical_diffs(
const Field_json *field) const {
if (!is_logical_diff_enabled(field)) return nullptr;
return m_partial_update_info->m_logical_diff_vectors[field->field_index];
}
bool TABLE::is_binary_diff_enabled(const Field *field) const {
return m_partial_update_info != nullptr &&
bitmap_is_set(&m_partial_update_info->m_enabled_binary_diff_columns,
field->field_index);
}
bool TABLE::is_logical_diff_enabled(const Field *field) const {
DBUG_TRACE;
bool ret =
m_partial_update_info != nullptr &&
bitmap_is_set(&m_partial_update_info->m_enabled_logical_diff_columns,
field->field_index);
DBUG_PRINT("info",
("field=%s "
"is_logical_diff_enabled returns=%d "
"(m_partial_update_info!=NULL)=%d "
"m_enabled_logical_diff_columns[column]=%s",
field->field_name, ret, m_partial_update_info != nullptr,
m_partial_update_info != nullptr
? (bitmap_is_set(
&m_partial_update_info->m_enabled_logical_diff_columns,
field->field_index)
? "1"
: "0")
: "unknown"));
return ret;
}
void TABLE::disable_logical_diffs_for_current_row(const Field *field) const {
DBUG_ASSERT(field->table == this);
DBUG_ASSERT(is_logical_diff_enabled(field));
// Remove the diffs collected for the column.
m_partial_update_info->m_logical_diff_vectors[field->field_index]->clear();
// Mark the column as disabled.
bitmap_clear_bit(&m_partial_update_info->m_enabled_logical_diff_columns,
field->field_index);
}
//////////////////////////////////////////////////////////////////////////
/*
NOTE:
The functions in this block are used to read .frm file.
They should not be used any where else in the code. They are only used
in upgrade scenario for migrating old data directory to be compatible
with current server. They will be removed in future release.
Any new code should not be added in this section.
*/
/**
Open and Read .frm file.
Based on header, it is decided if its a table or view.
Prepare TABLE_SHARE if its a table.
Prepare File_parser if its a view.
@param thd thread handle
@param share TABLE_SHARE object to be filled.
@param frm_context FRM_context for structures removed from
TABLE_SHARE
@param table table name
@param is_fix_view_cols_and_deps Flag to indicate that we are recreating view
to create view dependency entry in DD tables
@retval true Error
@retval false Success
*/
static bool read_frm_file(THD *thd, TABLE_SHARE *share,
FRM_context *frm_context, const std::string &table,
bool is_fix_view_cols_and_deps) {
File file;
uchar head[64];
char path[FN_REFLEN + 1];
MEM_ROOT **root_ptr, *old_root;
strxnmov(path, sizeof(path) - 1, share->normalized_path.str, reg_ext, NullS);
LEX_STRING pathstr = {path, strlen(path)};
if ((file = mysql_file_open(key_file_frm, path, O_RDONLY, MYF(0))) < 0) {
LogErr(ERROR_LEVEL, ER_CANT_OPEN_FRM_FILE, path);
return true;
}
if (mysql_file_read(file, head, 64, MYF(MY_NABP))) {
LogErr(ERROR_LEVEL, ER_CANT_READ_FRM_FILE, path);
goto err;
}
/*
Checking if the given .frm file is TABLE or VIEW.
*/
if (head[0] == (uchar)254 && head[1] == 1) {
if (head[2] == FRM_VER || head[2] == FRM_VER + 1 ||
(head[2] >= FRM_VER + 3 && head[2] <= FRM_VER + 4)) {
/*
This means this is a BASE_TABLE.
Don't read .frm file for tables if we are recreating views
to resolve dependency. At this time, all tables are already upgraded.
.frm file should be only read for views.
*/
if (is_fix_view_cols_and_deps) {
mysql_file_close(file, MYF(MY_WME));
return false;
}
int error;
root_ptr = THR_MALLOC;
old_root = *root_ptr;
*root_ptr = &share->mem_root;
error = open_binary_frm(thd, share, frm_context, head, file);
*root_ptr = old_root;
if (error) {
LogErr(ERROR_LEVEL, ER_CANT_READ_FRM_FILE, path);
goto err;
}
} else {
LogErr(ERROR_LEVEL, ER_TABLE_CREATED_WITH_DIFFERENT_VERSION,
table.c_str());
goto err;
}
} else if (memcmp(head, STRING_WITH_LEN("TYPE=")) == 0) {
if (memcmp(head + 5, "VIEW", 4) == 0) {
// View found
share->is_view = 1;
/*
Create view file parser and hold it in
FRM_context member view_def.
*/
frm_context->view_def =
sql_parse_prepare(&pathstr, &share->mem_root, true);
if (!frm_context->view_def) {
LogErr(ERROR_LEVEL, ER_VIEW_UNPARSABLE, pathstr.str);
goto err;
}
} else {
LogErr(ERROR_LEVEL, ER_FILE_TYPE_UNKNOWN, pathstr.str);
goto err;
}
} else {
LogErr(ERROR_LEVEL, ER_INVALID_INFO_IN_FRM, pathstr.str);
goto err;
}
// Close file and return
mysql_file_close(file, MYF(MY_WME));
return false;
err:
mysql_file_close(file, MYF(MY_WME));
return true;
}
bool create_table_share_for_upgrade(THD *thd, const char *path,
TABLE_SHARE *share,
FRM_context *frm_context,
const char *db_name, const char *table_name,
bool is_fix_view_cols_and_deps) {
DBUG_TRACE;
init_tmp_table_share(thd, share, db_name, 0, table_name, path, nullptr);
// Fix table categories set by init_tmp_table_share
share->table_category = TABLE_UNKNOWN_CATEGORY;
share->tmp_table = NO_TMP_TABLE;
mysql_mutex_init(key_TABLE_SHARE_LOCK_ha_data, &share->LOCK_ha_data,
MY_MUTEX_INIT_FAST);
if (read_frm_file(thd, share, frm_context, table_name,
is_fix_view_cols_and_deps)) {
free_table_share(share);
return true;
}
return false;
}
void TABLE::blobs_need_not_keep_old_value() {
for (Field **vfield_ptr = vfield; *vfield_ptr; vfield_ptr++) {
Field *vfield = *vfield_ptr;
/*
Set this flag so that all blob columns can keep the old value.
*/
if (vfield->handle_old_value())
(down_cast<Field_blob *>(vfield))->set_keep_old_value(false);
}
}
void TABLE::set_binlog_drop_if_temp(bool should_binlog) {
should_binlog_drop_if_temp_flag = should_binlog;
}
bool TABLE::should_binlog_drop_if_temp(void) const {
return should_binlog_drop_if_temp_flag;
}
bool TABLE::empty_result_table() {
materialized = false;
set_not_started();
if (!is_created()) return false;
if (file->ha_index_or_rnd_end() || file->ha_extra(HA_EXTRA_RESET_STATE) ||
file->ha_delete_all_rows())
return true;
free_io_cache(this);
filesort_free_buffers(this, 0);
return false;
}
void TABLE::update_covering_prefix_keys(Field *field, uint16 key_read_length,
Key_map *covering_prefix_keys) {
for (uint keyno = 0; keyno < s->keys; keyno++)
if (covering_prefix_keys->is_set(keyno)) {
KEY *key_info = &this->key_info[keyno];
for (KEY_PART_INFO *part = key_info->key_part,
*part_end = part + actual_key_parts(key_info);
part != part_end; ++part)
if ((part->key_part_flag & HA_PART_KEY_SEG) && field->eq(part->field)) {
uint16 key_part_length = part->length / field->charset()->mbmaxlen;
if (key_part_length < key_read_length) covering_keys.clear_bit(keyno);
}
}
}
//////////////////////////////////////////////////////////////////////////