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233 lines
9.3 KiB
233 lines
9.3 KiB
3 months ago
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/* Copyright (c) 2011, 2018, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License, version 2.0, for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#include "sql/opt_explain_traditional.h"
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#include <sys/types.h>
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#include "m_ctype.h"
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#include "m_string.h"
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "sql/current_thd.h"
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#include "sql/item.h"
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#include "sql/query_result.h"
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#include "sql/sql_class.h"
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#include "sql/sql_lex.h"
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#include "sql/sql_list.h"
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#include "sql_string.h"
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/**
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Heads of "extra" column parts
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This array must be in sync with Extra_tag enum.
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*/
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static const char *traditional_extra_tags[ET_total] = {
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NULL, // ET_none
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"Using temporary", // ET_USING_TEMPORARY
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"Using filesort", // ET_USING_FILESORT
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"Using index condition", // ET_USING_INDEX_CONDITION
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"Using", // ET_USING
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"Range checked for each record", // ET_RANGE_CHECKED_FOR_EACH_RECORD
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"Using pushed condition", // ET_USING_PUSHED_CONDITION
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"Using where", // ET_USING_WHERE
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"Not exists", // ET_NOT_EXISTS
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"Using MRR", // ET_USING_MRR
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"Using index", // ET_USING_INDEX
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"Full scan on NULL key", // ET_FULL_SCAN_ON_NULL_KEY
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"Using index for group-by", // ET_USING_INDEX_FOR_GROUP_BY
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"Using index for skip scan", // ET_USING_INDEX_FOR_SKIP_SCAN,
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"Distinct", // ET_DISTINCT
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"LooseScan", // ET_LOOSESCAN
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"Start temporary", // ET_START_TEMPORARY
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"End temporary", // ET_END_TEMPORARY
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"FirstMatch", // ET_FIRST_MATCH
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"Materialize", // ET_MATERIALIZE
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"Start materialize", // ET_START_MATERIALIZE
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"End materialize", // ET_END_MATERIALIZE
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"Scan", // ET_SCAN
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"Using join buffer", // ET_USING_JOIN_BUFFER
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"const row not found", // ET_CONST_ROW_NOT_FOUND
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"unique row not found", // ET_UNIQUE_ROW_NOT_FOUND
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"Impossible ON condition", // ET_IMPOSSIBLE_ON_CONDITION
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"", // ET_PUSHED_JOIN
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"Ft_hints:", // ET_FT_HINTS
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"Backward index scan", // ET_BACKWARD_SCAN
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"Recursive", // ET_RECURSIVE
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"Table function:", // ET_TABLE_FUNCTION
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"Index dive skipped due to FORCE", // ET_SKIP_RECORDS_IN_RANGE
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"Using secondary engine", // ET_USING_SECONDARY_ENGINE
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"Rematerialize" // ET_REMATERIALIZE
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};
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static const char *mod_type_name[] = {"NONE", "INSERT", "UPDATE", "DELETE",
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"REPLACE"};
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bool Explain_format_traditional::send_headers(Query_result *result) {
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return ((nil = new Item_null) == NULL ||
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Explain_format::send_headers(result) ||
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current_thd->send_explain_fields(output));
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}
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static bool push(List<Item> *items, qep_row::mem_root_str &s, Item_null *nil) {
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if (s.is_empty()) return items->push_back(nil);
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Item_string *item = new Item_string(s.str, s.length, system_charset_info);
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return item == NULL || items->push_back(item);
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}
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static bool push(List<Item> *items, const char *s, size_t length) {
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Item_string *item = new Item_string(s, length, system_charset_info);
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return item == NULL || items->push_back(item);
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}
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static bool push(List<Item> *items, List<const char> &c, Item_null *nil) {
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if (c.is_empty()) return items->push_back(nil);
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StringBuffer<1024> buff;
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List_iterator<const char> it(c);
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const char *s;
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while ((s = it++)) {
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buff.append(s);
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buff.append(",");
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}
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if (!buff.is_empty()) buff.length(buff.length() - 1); // remove last ","
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Item_string *item = new Item_string(buff.dup(current_thd->mem_root),
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buff.length(), system_charset_info);
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return item == NULL || items->push_back(item);
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}
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static bool push(List<Item> *items, const qep_row::column<uint> &c,
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Item_null *nil) {
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if (c.is_empty()) return items->push_back(nil);
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Item_uint *item = new Item_uint(c.get());
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return item == NULL || items->push_back(item);
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}
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static bool push(List<Item> *items, const qep_row::column<ulonglong> &c,
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Item_null *nil) {
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if (c.is_empty()) return items->push_back(nil);
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Item_int *item = new Item_int(c.get(), MY_INT64_NUM_DECIMAL_DIGITS);
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return item == NULL || items->push_back(item);
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}
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static bool push(List<Item> *items, const qep_row::column<float> &c,
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Item_null *nil) {
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if (c.is_empty()) return items->push_back(nil);
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Item_float *item = new Item_float(c.get(), 2);
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return item == NULL || items->push_back(item);
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}
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bool Explain_format_traditional::push_select_type(List<Item> *items) {
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DBUG_ASSERT(!column_buffer.col_select_type.is_empty());
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StringBuffer<32> buff;
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if (column_buffer.is_dependent) {
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if (buff.append(STRING_WITH_LEN("DEPENDENT "), system_charset_info))
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return true;
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} else if (!column_buffer.is_cacheable) {
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if (buff.append(STRING_WITH_LEN("UNCACHEABLE "), system_charset_info))
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return true;
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}
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const enum_explain_type sel_type = column_buffer.col_select_type.get();
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const char *type = (column_buffer.mod_type != MT_NONE &&
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(sel_type == enum_explain_type::EXPLAIN_PRIMARY ||
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sel_type == enum_explain_type::EXPLAIN_SIMPLE))
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? mod_type_name[column_buffer.mod_type]
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: SELECT_LEX::get_type_str(sel_type);
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if (buff.append(type)) return true;
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Item_string *item = new Item_string(buff.dup(current_thd->mem_root),
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buff.length(), system_charset_info);
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return item == NULL || items->push_back(item);
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}
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class Buffer_cleanup {
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public:
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explicit Buffer_cleanup(qep_row *row) : m_row(row) {}
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~Buffer_cleanup() { m_row->cleanup(); }
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private:
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qep_row *m_row;
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};
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bool Explain_format_traditional::flush_entry() {
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/*
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Buffer_cleanup will empty column_buffer upon exit. So column values start
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clear for the next row.
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*/
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Buffer_cleanup bc(&column_buffer);
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List<Item> items;
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if (push(&items, column_buffer.col_id, nil) || push_select_type(&items) ||
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push(&items, column_buffer.col_table_name, nil) ||
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push(&items, column_buffer.col_partitions, nil) ||
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push(&items, column_buffer.col_join_type, nil) ||
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push(&items, column_buffer.col_possible_keys, nil) ||
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push(&items, column_buffer.col_key, nil) ||
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push(&items, column_buffer.col_key_len, nil) ||
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push(&items, column_buffer.col_ref, nil) ||
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push(&items, column_buffer.col_rows, nil) ||
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push(&items, column_buffer.col_filtered, nil))
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return true;
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if (column_buffer.col_message.is_empty() &&
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column_buffer.col_extra.is_empty()) {
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if (items.push_back(nil)) return true;
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} else if (!column_buffer.col_extra.is_empty()) {
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StringBuffer<64> buff(system_charset_info);
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List_iterator<qep_row::extra> it(column_buffer.col_extra);
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qep_row::extra *e;
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while ((e = it++)) {
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DBUG_ASSERT(traditional_extra_tags[e->tag] != NULL);
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if (buff.append(traditional_extra_tags[e->tag])) return true;
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if (e->data) {
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bool brackets = false;
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switch (e->tag) {
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case ET_RANGE_CHECKED_FOR_EACH_RECORD:
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case ET_USING_INDEX_FOR_GROUP_BY:
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case ET_USING_JOIN_BUFFER:
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case ET_FIRST_MATCH:
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case ET_REMATERIALIZE:
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brackets = true; // for backward compatibility
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break;
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default:
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break;
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}
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if (e->tag != ET_FIRST_MATCH && // for backward compatibility
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e->tag != ET_PUSHED_JOIN && buff.append(" "))
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return true;
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if (brackets && buff.append("(")) return true;
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if (buff.append(e->data)) return true;
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if (brackets && buff.append(")")) return true;
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}
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if (buff.append("; ")) return true;
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}
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if (!buff.is_empty()) buff.length(buff.length() - 2); // remove last "; "
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if (push(&items, buff.dup(current_thd->mem_root), buff.length()))
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return true;
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} else {
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if (push(&items, column_buffer.col_message, nil)) return true;
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}
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if (output->send_data(current_thd, items)) return true;
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return false;
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}
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