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635 lines
16 KiB
635 lines
16 KiB
5 months ago
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/*
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Copyright (c) 2015, 2019, 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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/*
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Optimizer hint parser grammar
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*/
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%{
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#include "my_inttypes.h"
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#include "sql/derror.h"
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#include "sql/parse_tree_helpers.h" // check_resource_group_name_len
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#include "sql/parse_tree_hints.h"
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#include "sql/parser_yystype.h"
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#include "sql/sql_class.h"
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#include "sql/sql_const.h"
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#include "sql/sql_lex_hints.h"
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#define NEW_PTN new (thd->mem_root)
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static bool parse_int(longlong *to, const char *from, size_t from_length)
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{
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int error;
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const char *end= from + from_length;
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*to= my_strtoll10(from, &end, &error);
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return error != 0 || end != from + from_length;
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}
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%}
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%pure-parser
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%parse-param { class THD *thd }
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%parse-param { class Hint_scanner *scanner }
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%parse-param { class PT_hint_list **ret }
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%lex-param { class Hint_scanner *scanner }
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%expect 0
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/* Hint keyword tokens */
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%token MAX_EXECUTION_TIME_HINT
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%token RESOURCE_GROUP_HINT
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%token BKA_HINT
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%token BNL_HINT
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%token DUPSWEEDOUT_HINT
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%token FIRSTMATCH_HINT
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%token INTOEXISTS_HINT
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%token LOOSESCAN_HINT
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%token MATERIALIZATION_HINT
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%token NO_BKA_HINT
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%token NO_BNL_HINT
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%token NO_ICP_HINT
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%token NO_MRR_HINT
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%token NO_RANGE_OPTIMIZATION_HINT
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%token NO_SEMIJOIN_HINT
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%token MRR_HINT
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%token QB_NAME_HINT
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%token SEMIJOIN_HINT
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%token SUBQUERY_HINT
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%token DERIVED_MERGE_HINT
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%token NO_DERIVED_MERGE_HINT
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%token JOIN_PREFIX_HINT
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%token JOIN_SUFFIX_HINT
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%token JOIN_ORDER_HINT
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%token JOIN_FIXED_ORDER_HINT
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%token INDEX_MERGE_HINT
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%token NO_INDEX_MERGE_HINT
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%token SET_VAR_HINT
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%token SKIP_SCAN_HINT
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%token NO_SKIP_SCAN_HINT
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%token HASH_JOIN_HINT
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%token NO_HASH_JOIN_HINT
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/* Other tokens */
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%token HINT_ARG_NUMBER
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%token HINT_ARG_IDENT
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%token HINT_ARG_QB_NAME
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%token HINT_ARG_TEXT
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%token HINT_IDENT_OR_NUMBER_WITH_SCALE
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%token HINT_CLOSE
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%token HINT_ERROR
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/* Types */
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%type <hint_type>
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key_level_hint_type_on
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key_level_hint_type_off
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table_level_hint_type_on
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table_level_hint_type_off
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%type <hint>
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hint
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max_execution_time_hint
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index_level_hint
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table_level_hint
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qb_level_hint
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qb_name_hint
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set_var_hint
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resource_group_hint
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%type <hint_list> hint_list
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%type <lexer.hint_string> hint_param_index
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%type <hint_param_index_list> hint_param_index_list opt_hint_param_index_list
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%type <hint_param_table>
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hint_param_table
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hint_param_table_ext
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hint_param_table_empty_qb
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%type <hint_param_table_list>
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hint_param_table_list
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opt_hint_param_table_list
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hint_param_table_list_empty_qb
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opt_hint_param_table_list_empty_qb
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%type <lexer.hint_string>
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HINT_ARG_IDENT
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HINT_ARG_NUMBER
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HINT_ARG_QB_NAME
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HINT_ARG_TEXT
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HINT_IDENT_OR_NUMBER_WITH_SCALE
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MAX_EXECUTION_TIME_HINT
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opt_qb_name
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set_var_ident
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set_var_text_value
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%type <item>
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set_var_num_item
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set_var_string_item
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set_var_arg
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%type <ulong_num>
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semijoin_strategy semijoin_strategies
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subquery_strategy
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%%
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start:
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hint_list HINT_CLOSE
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{ *ret= $1; }
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| hint_list error HINT_CLOSE
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{ *ret= $1; }
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| error HINT_CLOSE
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{ *ret= NULL; }
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;
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hint_list:
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hint
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{
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$$= NEW_PTN PT_hint_list(thd->mem_root);
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if ($$ == NULL || $$->push_back($1))
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YYABORT; // OOM
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}
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| hint_list hint
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{
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$1->push_back($2);
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$$= $1;
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}
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;
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hint:
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index_level_hint
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| table_level_hint
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| qb_level_hint
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| qb_name_hint
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| max_execution_time_hint
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| set_var_hint
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| resource_group_hint
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;
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max_execution_time_hint:
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MAX_EXECUTION_TIME_HINT '(' HINT_ARG_NUMBER ')'
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{
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longlong n;
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if (parse_int(&n, $3.str, $3.length) || n > UINT_MAX32)
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{
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scanner->syntax_warning(ER_THD(thd,
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ER_WARN_BAD_MAX_EXECUTION_TIME));
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$$= NULL;
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}
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else
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{
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$$= NEW_PTN PT_hint_max_execution_time(n);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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}
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;
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opt_hint_param_table_list:
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/* empty */ { $$.init(thd->mem_root); }
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| hint_param_table_list
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;
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hint_param_table_list:
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hint_param_table
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{
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$$.init(thd->mem_root);
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if ($$.push_back($1))
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YYABORT; // OOM
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}
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| hint_param_table_list ',' hint_param_table
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{
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if ($1.push_back($3))
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YYABORT; // OOM
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$$= $1;
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}
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;
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opt_hint_param_table_list_empty_qb:
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/* empty */ { $$.init(thd->mem_root); }
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| hint_param_table_list_empty_qb
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;
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hint_param_table_list_empty_qb:
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hint_param_table_empty_qb
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{
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$$.init(thd->mem_root);
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if ($$.push_back($1))
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YYABORT; // OOM
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}
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| hint_param_table_list_empty_qb ',' hint_param_table_empty_qb
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{
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if ($1.push_back($3))
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YYABORT; // OOM
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$$= $1;
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}
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;
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opt_hint_param_index_list:
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/* empty */ { $$.init(thd->mem_root); }
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| hint_param_index_list
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;
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hint_param_index_list:
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hint_param_index
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{
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$$.init(thd->mem_root);
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if ($$.push_back($1))
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YYABORT; // OOM
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}
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| hint_param_index_list ',' hint_param_index
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{
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if ($1.push_back($3))
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YYABORT; // OOM
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$$= $1;
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}
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;
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hint_param_index:
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HINT_ARG_IDENT
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;
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hint_param_table_empty_qb:
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HINT_ARG_IDENT
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{
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$$.table= $1;
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$$.opt_query_block= NULL_CSTR;
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}
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;
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hint_param_table:
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HINT_ARG_IDENT opt_qb_name
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{
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$$.table= $1;
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$$.opt_query_block= $2;
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}
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;
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hint_param_table_ext:
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hint_param_table
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| HINT_ARG_QB_NAME HINT_ARG_IDENT
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{
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$$.table= $2;
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$$.opt_query_block= $1;
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}
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;
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opt_qb_name:
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/* empty */ { $$= NULL_CSTR; }
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| HINT_ARG_QB_NAME
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;
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qb_level_hint:
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SEMIJOIN_HINT '(' opt_qb_name semijoin_strategies ')'
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{
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$$= NEW_PTN PT_qb_level_hint($3, true, SEMIJOIN_HINT_ENUM, $4);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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NO_SEMIJOIN_HINT '(' opt_qb_name semijoin_strategies ')'
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{
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$$= NEW_PTN PT_qb_level_hint($3, false, SEMIJOIN_HINT_ENUM, $4);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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SUBQUERY_HINT '(' opt_qb_name subquery_strategy ')'
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{
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$$= NEW_PTN PT_qb_level_hint($3, true, SUBQUERY_HINT_ENUM, $4);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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JOIN_PREFIX_HINT '(' opt_hint_param_table_list ')'
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{
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$$= NEW_PTN PT_qb_level_hint(NULL_CSTR, true, JOIN_PREFIX_HINT_ENUM, $3);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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JOIN_PREFIX_HINT '(' HINT_ARG_QB_NAME opt_hint_param_table_list_empty_qb ')'
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{
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$$= NEW_PTN PT_qb_level_hint($3, true, JOIN_PREFIX_HINT_ENUM, $4);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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JOIN_SUFFIX_HINT '(' opt_hint_param_table_list ')'
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{
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$$= NEW_PTN PT_qb_level_hint(NULL_CSTR, true, JOIN_SUFFIX_HINT_ENUM, $3);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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||
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JOIN_SUFFIX_HINT '(' HINT_ARG_QB_NAME opt_hint_param_table_list_empty_qb ')'
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{
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$$= NEW_PTN PT_qb_level_hint($3, true, JOIN_SUFFIX_HINT_ENUM, $4);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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JOIN_ORDER_HINT '(' opt_hint_param_table_list ')'
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{
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$$= NEW_PTN PT_qb_level_hint(NULL_CSTR, true, JOIN_ORDER_HINT_ENUM, $3);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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JOIN_ORDER_HINT '(' HINT_ARG_QB_NAME opt_hint_param_table_list_empty_qb ')'
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{
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$$= NEW_PTN PT_qb_level_hint($3, true, JOIN_ORDER_HINT_ENUM, $4);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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||
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JOIN_FIXED_ORDER_HINT '(' opt_qb_name ')'
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{
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$$= NEW_PTN PT_qb_level_hint($3, true, JOIN_FIXED_ORDER_HINT_ENUM, 0);
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if ($$ == NULL)
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YYABORT; // OOM
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||
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}
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||
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;
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||
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semijoin_strategies:
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||
|
|
/* empty */ { $$= 0; }
|
||
|
|
| semijoin_strategy
|
||
|
|
{
|
||
|
|
$$= $1;
|
||
|
|
}
|
||
|
|
| semijoin_strategies ',' semijoin_strategy
|
||
|
|
{
|
||
|
|
$$= $1 | $3;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
semijoin_strategy:
|
||
|
|
FIRSTMATCH_HINT { $$= OPTIMIZER_SWITCH_FIRSTMATCH; }
|
||
|
|
| LOOSESCAN_HINT { $$= OPTIMIZER_SWITCH_LOOSE_SCAN; }
|
||
|
|
| MATERIALIZATION_HINT { $$= OPTIMIZER_SWITCH_MATERIALIZATION; }
|
||
|
|
| DUPSWEEDOUT_HINT { $$= OPTIMIZER_SWITCH_DUPSWEEDOUT; }
|
||
|
|
;
|
||
|
|
|
||
|
|
subquery_strategy:
|
||
|
|
MATERIALIZATION_HINT { $$=
|
||
|
|
Item_exists_subselect::EXEC_MATERIALIZATION; }
|
||
|
|
| INTOEXISTS_HINT { $$= Item_exists_subselect::EXEC_EXISTS; }
|
||
|
|
;
|
||
|
|
|
||
|
|
|
||
|
|
table_level_hint:
|
||
|
|
table_level_hint_type_on '(' opt_hint_param_table_list ')'
|
||
|
|
{
|
||
|
|
$$= NEW_PTN PT_table_level_hint(NULL_CSTR, $3, true, $1);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
| table_level_hint_type_on
|
||
|
|
'(' HINT_ARG_QB_NAME opt_hint_param_table_list_empty_qb ')'
|
||
|
|
{
|
||
|
|
$$= NEW_PTN PT_table_level_hint($3, $4, true, $1);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
| table_level_hint_type_off '(' opt_hint_param_table_list ')'
|
||
|
|
{
|
||
|
|
$$= NEW_PTN PT_table_level_hint(NULL_CSTR, $3, false, $1);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
| table_level_hint_type_off
|
||
|
|
'(' HINT_ARG_QB_NAME opt_hint_param_table_list_empty_qb ')'
|
||
|
|
{
|
||
|
|
$$= NEW_PTN PT_table_level_hint($3, $4, false, $1);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
index_level_hint:
|
||
|
|
key_level_hint_type_on
|
||
|
|
'(' hint_param_table_ext opt_hint_param_index_list ')'
|
||
|
|
{
|
||
|
|
$$= NEW_PTN PT_key_level_hint($3, $4, true, $1);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
| key_level_hint_type_off
|
||
|
|
'(' hint_param_table_ext opt_hint_param_index_list ')'
|
||
|
|
{
|
||
|
|
$$= NEW_PTN PT_key_level_hint($3, $4, false, $1);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
table_level_hint_type_on:
|
||
|
|
BKA_HINT
|
||
|
|
{
|
||
|
|
$$= BKA_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| BNL_HINT
|
||
|
|
{
|
||
|
|
$$= BNL_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| HASH_JOIN_HINT
|
||
|
|
{
|
||
|
|
$$= HASH_JOIN_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| DERIVED_MERGE_HINT
|
||
|
|
{
|
||
|
|
$$= DERIVED_MERGE_HINT_ENUM;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
table_level_hint_type_off:
|
||
|
|
NO_BKA_HINT
|
||
|
|
{
|
||
|
|
$$= BKA_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| NO_BNL_HINT
|
||
|
|
{
|
||
|
|
$$= BNL_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| NO_HASH_JOIN_HINT
|
||
|
|
{
|
||
|
|
$$= HASH_JOIN_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| NO_DERIVED_MERGE_HINT
|
||
|
|
{
|
||
|
|
$$= DERIVED_MERGE_HINT_ENUM;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
key_level_hint_type_on:
|
||
|
|
MRR_HINT
|
||
|
|
{
|
||
|
|
$$= MRR_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| NO_RANGE_OPTIMIZATION_HINT
|
||
|
|
{
|
||
|
|
$$= NO_RANGE_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| INDEX_MERGE_HINT
|
||
|
|
{
|
||
|
|
$$= INDEX_MERGE_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| SKIP_SCAN_HINT
|
||
|
|
{
|
||
|
|
$$= SKIP_SCAN_HINT_ENUM;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
key_level_hint_type_off:
|
||
|
|
NO_ICP_HINT
|
||
|
|
{
|
||
|
|
$$= ICP_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| NO_MRR_HINT
|
||
|
|
{
|
||
|
|
$$= MRR_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| NO_INDEX_MERGE_HINT
|
||
|
|
{
|
||
|
|
$$= INDEX_MERGE_HINT_ENUM;
|
||
|
|
}
|
||
|
|
| NO_SKIP_SCAN_HINT
|
||
|
|
{
|
||
|
|
$$= SKIP_SCAN_HINT_ENUM;
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
qb_name_hint:
|
||
|
|
QB_NAME_HINT '(' HINT_ARG_IDENT ')'
|
||
|
|
{
|
||
|
|
$$= NEW_PTN PT_hint_qb_name($3);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
set_var_hint:
|
||
|
|
SET_VAR_HINT '(' set_var_ident '=' set_var_arg ')'
|
||
|
|
{
|
||
|
|
$$= NEW_PTN PT_hint_sys_var($3, $5);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
resource_group_hint:
|
||
|
|
RESOURCE_GROUP_HINT '(' HINT_ARG_IDENT ')'
|
||
|
|
{
|
||
|
|
if (check_resource_group_name_len($3, Sql_condition::SL_WARNING))
|
||
|
|
YYERROR;
|
||
|
|
|
||
|
|
$$= NEW_PTN PT_hint_resource_group($3);
|
||
|
|
if ($$ == nullptr)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
set_var_ident:
|
||
|
|
HINT_ARG_IDENT
|
||
|
|
| MAX_EXECUTION_TIME_HINT
|
||
|
|
;
|
||
|
|
|
||
|
|
set_var_num_item:
|
||
|
|
HINT_ARG_NUMBER
|
||
|
|
{
|
||
|
|
longlong n;
|
||
|
|
if (parse_int(&n, $1.str, $1.length))
|
||
|
|
{
|
||
|
|
scanner->syntax_warning(ER_THD(thd, ER_WRONG_SIZE_NUMBER));
|
||
|
|
$$= NULL;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
$$= NEW_PTN Item_int((ulonglong)n);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
}
|
||
|
|
| HINT_IDENT_OR_NUMBER_WITH_SCALE
|
||
|
|
{
|
||
|
|
longlong n;
|
||
|
|
if (parse_int(&n, $1.str, $1.length - 1))
|
||
|
|
{
|
||
|
|
scanner->syntax_warning(ER_THD(thd, ER_WRONG_SIZE_NUMBER));
|
||
|
|
$$= NULL;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
int multiplier;
|
||
|
|
switch ($1.str[$1.length - 1]) {
|
||
|
|
case 'K': multiplier= 1024; break;
|
||
|
|
case 'M': multiplier= 1024 * 1024; break;
|
||
|
|
case 'G': multiplier= 1024 * 1024 * 1024; break;
|
||
|
|
default:
|
||
|
|
DBUG_ASSERT(0); // should not happen
|
||
|
|
YYABORT; // for sure
|
||
|
|
}
|
||
|
|
if (1.0L * n * multiplier > LLONG_MAX)
|
||
|
|
{
|
||
|
|
scanner->syntax_warning(ER_THD(thd, ER_WRONG_SIZE_NUMBER));
|
||
|
|
$$= NULL;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
$$= NEW_PTN Item_int((ulonglong)n * multiplier);
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
;
|
||
|
|
|
||
|
|
set_var_text_value:
|
||
|
|
HINT_ARG_IDENT
|
||
|
|
| HINT_ARG_TEXT
|
||
|
|
;
|
||
|
|
|
||
|
|
set_var_string_item:
|
||
|
|
set_var_text_value
|
||
|
|
{
|
||
|
|
$$= NEW_PTN Item_string($1.str, $1.length, thd->charset());
|
||
|
|
if ($$ == NULL)
|
||
|
|
YYABORT; // OOM
|
||
|
|
}
|
||
|
|
|
||
|
|
set_var_arg:
|
||
|
|
set_var_string_item
|
||
|
|
| set_var_num_item
|
||
|
|
;
|