412 lines
9.6 KiB
Plaintext
412 lines
9.6 KiB
Plaintext
/*
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Copyright (c) 2015, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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 "sql_class.h"
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#include "parse_tree_hints.h"
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#include "sql_lex_hints.h"
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#include "sql_const.h"
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#define NEW_PTN new (thd->mem_root)
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%}
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%pure-parser
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%yacc
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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 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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/* 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_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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%type <hint_list> hint_list
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%type <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 <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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opt_qb_name
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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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;
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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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int error;
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char *end= const_cast<char *>($3.str + $3.length);
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longlong n= my_strtoll10($3.str, &end, &error);
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if (error != 0 || end != $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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;
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semijoin_strategies:
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/* empty */ { $$= 0; }
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| semijoin_strategy
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{
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$$= $1;
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}
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| semijoin_strategies ',' semijoin_strategy
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{
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$$= $1 | $3;
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}
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;
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semijoin_strategy:
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FIRSTMATCH_HINT { $$= OPTIMIZER_SWITCH_FIRSTMATCH; }
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| LOOSESCAN_HINT { $$= OPTIMIZER_SWITCH_LOOSE_SCAN; }
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| MATERIALIZATION_HINT { $$= OPTIMIZER_SWITCH_MATERIALIZATION; }
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| DUPSWEEDOUT_HINT { $$= OPTIMIZER_SWITCH_DUPSWEEDOUT; }
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;
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subquery_strategy:
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MATERIALIZATION_HINT { $$=
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Item_exists_subselect::EXEC_MATERIALIZATION; }
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| INTOEXISTS_HINT { $$= Item_exists_subselect::EXEC_EXISTS; }
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;
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table_level_hint:
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table_level_hint_type_on '(' opt_hint_param_table_list ')'
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{
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$$= NEW_PTN PT_table_level_hint(NULL_CSTR, $3, TRUE, $1);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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| table_level_hint_type_on
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'(' HINT_ARG_QB_NAME opt_hint_param_table_list_empty_qb ')'
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{
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$$= NEW_PTN PT_table_level_hint($3, $4, TRUE, $1);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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| table_level_hint_type_off '(' opt_hint_param_table_list ')'
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{
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$$= NEW_PTN PT_table_level_hint(NULL_CSTR, $3, FALSE, $1);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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| table_level_hint_type_off
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'(' HINT_ARG_QB_NAME opt_hint_param_table_list_empty_qb ')'
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{
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$$= NEW_PTN PT_table_level_hint($3, $4, FALSE, $1);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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;
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index_level_hint:
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key_level_hint_type_on
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'(' hint_param_table_ext opt_hint_param_index_list ')'
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{
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$$= NEW_PTN PT_key_level_hint($3, $4, TRUE, $1);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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| key_level_hint_type_off
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'(' hint_param_table_ext opt_hint_param_index_list ')'
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{
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$$= NEW_PTN PT_key_level_hint($3, $4, FALSE, $1);
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if ($$ == NULL)
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YYABORT; // OOM
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}
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;
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table_level_hint_type_on:
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BKA_HINT
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{
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$$= BKA_HINT_ENUM;
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}
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| BNL_HINT
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{
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$$= BNL_HINT_ENUM;
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}
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;
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table_level_hint_type_off:
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NO_BKA_HINT
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{
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$$= BKA_HINT_ENUM;
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}
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| NO_BNL_HINT
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{
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$$= BNL_HINT_ENUM;
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}
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;
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key_level_hint_type_on:
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MRR_HINT
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{
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$$= MRR_HINT_ENUM;
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}
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| NO_RANGE_OPTIMIZATION_HINT
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{
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$$= NO_RANGE_HINT_ENUM;
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}
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;
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key_level_hint_type_off:
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NO_ICP_HINT
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{
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$$= ICP_HINT_ENUM;
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}
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| NO_MRR_HINT
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{
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$$= MRR_HINT_ENUM;
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}
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;
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qb_name_hint:
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QB_NAME_HINT '(' HINT_ARG_IDENT ')'
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{
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$$= NEW_PTN PT_hint_qb_name($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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