/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. 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 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* YACC and LEX Definitions */ /* These may not be declared yet */ class Table_ident; class sql_exchange; class LEX_COLUMN; class sp_head; class sp_name; class sp_instr; class sp_pcontext; /* The following hack is needed because mysql_yacc.cc does not define YYSTYPE before including this file */ #include "set_var.h" #ifdef MYSQL_YACC #define LEX_YYSTYPE void * #else #include "lex_symbol.h" #include "sql_yacc.h" #define LEX_YYSTYPE YYSTYPE * #endif /* When a command is added here, be sure it's also added in mysqld.cc in "struct show_var_st status_vars[]= {" ... */ enum enum_sql_command { SQLCOM_SELECT, SQLCOM_CREATE_TABLE, SQLCOM_CREATE_INDEX, SQLCOM_ALTER_TABLE, SQLCOM_UPDATE, SQLCOM_INSERT, SQLCOM_INSERT_SELECT, SQLCOM_DELETE, SQLCOM_TRUNCATE, SQLCOM_DROP_TABLE, SQLCOM_DROP_INDEX, SQLCOM_SHOW_DATABASES, SQLCOM_SHOW_TABLES, SQLCOM_SHOW_FIELDS, SQLCOM_SHOW_KEYS, SQLCOM_SHOW_VARIABLES, SQLCOM_SHOW_LOGS, SQLCOM_SHOW_STATUS, SQLCOM_SHOW_INNODB_STATUS, SQLCOM_SHOW_PROCESSLIST, SQLCOM_SHOW_MASTER_STAT, SQLCOM_SHOW_SLAVE_STAT, SQLCOM_SHOW_GRANTS, SQLCOM_SHOW_CREATE, SQLCOM_SHOW_CHARSETS, SQLCOM_SHOW_COLLATIONS, SQLCOM_SHOW_CREATE_DB, SQLCOM_LOAD,SQLCOM_SET_OPTION,SQLCOM_LOCK_TABLES,SQLCOM_UNLOCK_TABLES, SQLCOM_GRANT, SQLCOM_CHANGE_DB, SQLCOM_CREATE_DB, SQLCOM_DROP_DB, SQLCOM_ALTER_DB, SQLCOM_REPAIR, SQLCOM_REPLACE, SQLCOM_REPLACE_SELECT, SQLCOM_CREATE_FUNCTION, SQLCOM_DROP_FUNCTION, SQLCOM_REVOKE,SQLCOM_OPTIMIZE, SQLCOM_CHECK, SQLCOM_ASSIGN_TO_KEYCACHE, SQLCOM_PRELOAD_KEYS, SQLCOM_FLUSH, SQLCOM_KILL, SQLCOM_ANALYZE, SQLCOM_ROLLBACK, SQLCOM_ROLLBACK_TO_SAVEPOINT, SQLCOM_COMMIT, SQLCOM_SAVEPOINT, SQLCOM_SLAVE_START, SQLCOM_SLAVE_STOP, SQLCOM_BEGIN, SQLCOM_LOAD_MASTER_TABLE, SQLCOM_CHANGE_MASTER, SQLCOM_RENAME_TABLE, SQLCOM_BACKUP_TABLE, SQLCOM_RESTORE_TABLE, SQLCOM_RESET, SQLCOM_PURGE, SQLCOM_PURGE_BEFORE, SQLCOM_SHOW_BINLOGS, SQLCOM_SHOW_OPEN_TABLES, SQLCOM_LOAD_MASTER_DATA, SQLCOM_HA_OPEN, SQLCOM_HA_CLOSE, SQLCOM_HA_READ, SQLCOM_SHOW_SLAVE_HOSTS, SQLCOM_DELETE_MULTI, SQLCOM_UPDATE_MULTI, SQLCOM_SHOW_BINLOG_EVENTS, SQLCOM_SHOW_NEW_MASTER, SQLCOM_DO, SQLCOM_SHOW_WARNS, SQLCOM_EMPTY_QUERY, SQLCOM_SHOW_ERRORS, SQLCOM_SHOW_COLUMN_TYPES, SQLCOM_SHOW_STORAGE_ENGINES, SQLCOM_SHOW_PRIVILEGES, SQLCOM_HELP, SQLCOM_DROP_USER, SQLCOM_REVOKE_ALL, SQLCOM_CHECKSUM, SQLCOM_CREATE_PROCEDURE, SQLCOM_CREATE_SPFUNCTION, SQLCOM_CALL, SQLCOM_DROP_PROCEDURE, SQLCOM_ALTER_PROCEDURE,SQLCOM_ALTER_FUNCTION, SQLCOM_SHOW_CREATE_PROC, SQLCOM_SHOW_CREATE_FUNC, SQLCOM_SHOW_STATUS_PROC, SQLCOM_SHOW_STATUS_FUNC, SQLCOM_PREPARE, SQLCOM_EXECUTE, SQLCOM_DEALLOCATE_PREPARE, SQLCOM_CREATE_VIEW, SQLCOM_DROP_VIEW, /* This should be the last !!! */ SQLCOM_END }; // describe/explain types #define DESCRIBE_NORMAL 1 #define DESCRIBE_EXTENDED 2 enum suid_behaviour { IS_DEFAULT_SUID= 0, IS_NOT_SUID, IS_SUID }; #define DERIVED_SUBQUERY 1 #define DERIVED_VIEW 2 enum enum_view_create_mode { VIEW_CREATE_NEW, // check that there are not such VIEW/table VIEW_ALTER, // check that VIEW .frm with such name exists VIEW_CREATE_OR_REPLACE // check only that there are not such table }; enum enum_drop_mode { DROP_DEFAULT, // mode is not specified DROP_CASCADE, // CASCADE option DROP_RESTRICT // RESTRICT option }; typedef List List_item; typedef struct st_lex_master_info { char *host, *user, *password, *log_file_name; uint port, connect_retry; ulonglong pos; ulong server_id; /* Variable for MASTER_SSL option. MASTER_SSL=0 in CHANGE MASTER TO corresponds to SSL_DISABLE MASTER_SSL=1 corresponds to SSL_ENABLE */ enum {SSL_UNCHANGED=0, SSL_DISABLE, SSL_ENABLE} ssl; char *ssl_key, *ssl_cert, *ssl_ca, *ssl_capath, *ssl_cipher; char *relay_log_name; ulong relay_log_pos; } LEX_MASTER_INFO; enum sub_select_type { UNSPECIFIED_TYPE,UNION_TYPE, INTERSECT_TYPE, EXCEPT_TYPE, GLOBAL_OPTIONS_TYPE, DERIVED_TABLE_TYPE, OLAP_TYPE }; enum olap_type { UNSPECIFIED_OLAP_TYPE, CUBE_TYPE, ROLLUP_TYPE }; enum tablespace_op_type { NO_TABLESPACE_OP, DISCARD_TABLESPACE, IMPORT_TABLESPACE }; /* The state of the lex parsing for selects All select describing structures linked with following pointers: - list of neighbors (next/prev) (prev of first element point to slave pointer of upper structure) - one level units for unit (union) structure - member of one union(unit) for ordinary select_lex - pointer to master - outer select_lex for unit (union) - unit structure for ordinary select_lex - pointer to slave - first list element of select_lex belonged to this unit for unit - first unit in list of units that belong to this select_lex (as subselects or derived tables) for ordinary select_lex - list of all select_lex (for group operation like correcting list of opened tables) - if unit contain several selects (union) then it have special select_lex called fake_select_lex. It used for storing global parameters and executing union. subqueries of global ORDER BY clause will be attached to this fake_select_lex, which will allow them correctly resolve fields of 'upper' union and other more outer selects. for example for following query: select * from table1 where table1.field IN (select * from table1_1_1 union select * from table1_1_2) union select * from table2 where table2.field=(select (select f1 from table2_1_1_1_1 where table2_1_1_1_1.f2=table2_1_1.f3) from table2_1_1 where table2_1_1.f1=table2.f2) union select * from table3; we will have following structure: main unit fake0 select1 select2 select3 |^^ |^ s||| ||master l||| |+---------------------------------+ a||| +---------------------------------+| v|||master slave || e||+-------------------------+ || V| neighbor | V| unit1.1<+==================>unit1.2 unit2.1 fake1.1 select1.1.1 select 1.1.2 select1.2.1 select2.1.1 |^ || V| unit2.1.1.1 select2.1.1.1.1 relation in main unit will be following: main unit |^^^^|fake_select_lex |||||+--------------------------------------------+ ||||+--------------------------------------------+| |||+------------------------------+ || ||+--------------+ | || slave||master | | || V| neighbor | neighbor | master|V select1<========>select2<========>select3 fake0 list of all select_lex will be following (as it will be constructed by parser): select1->select2->select3->select2.1.1->select 2.1.2->select2.1.1.1.1-+ | +---------------------------------------------------------------------+ | +->select1.1.1->select1.1.2 */ /* Base class for st_select_lex (SELECT_LEX) & st_select_lex_unit (SELECT_LEX_UNIT) */ struct st_lex; class st_select_lex; class st_select_lex_unit; class st_select_lex_node { protected: st_select_lex_node *next, **prev, /* neighbor list */ *master, *slave, /* vertical links */ *link_next, **link_prev; /* list of whole SELECT_LEX */ public: enum enum_parsing_place { NO_MATTER, IN_HAVING, SELECT_LIST }; ulong options; /* result of this query can't be cached, bit field, can be : UNCACHEABLE_DEPENDENT UNCACHEABLE_RAND UNCACHEABLE_SIDEEFFECT UNCACHEABLE_EXPLAIN */ uint8 uncacheable; enum sub_select_type linkage; bool no_table_names_allowed; /* used for global order by */ bool no_error; /* suppress error message (convert it to warnings) */ static void *operator new(size_t size) { return (void*) sql_alloc((uint) size); } static void *operator new(size_t size, MEM_ROOT *mem_root) { return (void*) alloc_root(mem_root, (uint) size); } static void operator delete(void *ptr,size_t size) {} st_select_lex_node(): linkage(UNSPECIFIED_TYPE) {} virtual ~st_select_lex_node() {} inline st_select_lex_node* get_master() { return master; } virtual void init_query(); virtual void init_select(); void include_down(st_select_lex_node *upper); void include_neighbour(st_select_lex_node *before); void include_standalone(st_select_lex_node *sel, st_select_lex_node **ref); void include_global(st_select_lex_node **plink); void exclude(); virtual st_select_lex_unit* master_unit()= 0; virtual st_select_lex* outer_select()= 0; virtual st_select_lex* return_after_parsing()= 0; virtual bool set_braces(bool value); virtual bool inc_in_sum_expr(); virtual uint get_in_sum_expr(); virtual TABLE_LIST* get_table_list(); virtual List* get_item_list(); virtual List* get_use_index(); virtual List* get_ignore_index(); virtual ulong get_table_join_options(); virtual TABLE_LIST *add_table_to_list(THD *thd, Table_ident *table, LEX_STRING *alias, ulong table_options, thr_lock_type flags= TL_UNLOCK, List *use_index= 0, List *ignore_index= 0, LEX_STRING *option= 0); virtual void set_lock_for_tables(thr_lock_type lock_type) {} friend class st_select_lex_unit; friend bool mysql_new_select(struct st_lex *lex, bool move_down); friend my_bool mysql_make_view (File_parser *parser, TABLE_LIST *table); private: void fast_exclude(); }; typedef class st_select_lex_node SELECT_LEX_NODE; /* SELECT_LEX_UNIT - unit of selects (UNION, INTERSECT, ...) group SELECT_LEXs */ struct st_lex; class THD; class select_result; class JOIN; class select_union; class st_select_lex_unit: public st_select_lex_node { protected: TABLE_LIST result_table_list; select_union *union_result; TABLE *table; /* temporary table using for appending UNION results */ select_result *result; int res; ulong found_rows_for_union; bool prepared, // prepare phase already performed for UNION (unit) optimized, // optimize phase already performed for UNION (unit) executed, // already executed cleaned; public: // list of fields which points to temporary table for union List item_list; /* list of types of items inside union (used for union & derived tables) Item_type_holders from which this list consist may have pointers to Field, pointers is valid only after preparing SELECTS of this unit and before any SELECT of this unit execution */ List types; /* Pointer to 'last' select or pointer to unit where stored global parameters for union */ st_select_lex *global_parameters; //node on wich we should return current_select pointer after parsing subquery st_select_lex *return_to; /* LIMIT clause runtime counters */ ha_rows select_limit_cnt, offset_limit_cnt; /* not NULL if unit used in subselect, point to subselect item */ Item_subselect *item; /* thread handler */ THD *thd; /* SELECT_LEX for hidden SELECT in onion which process global ORDER BY and LIMIT */ st_select_lex *fake_select_lex; st_select_lex *union_distinct; /* pointer to the last UNION DISTINCT */ bool describe; /* union exec() called for EXPLAIN */ void init_query(); st_select_lex_unit* master_unit(); st_select_lex* outer_select(); st_select_lex* first_select() { return my_reinterpret_cast(st_select_lex*)(slave); } st_select_lex* first_select_in_union() { return my_reinterpret_cast(st_select_lex*)(slave); } st_select_lex_unit* next_unit() { return my_reinterpret_cast(st_select_lex_unit*)(next); } st_select_lex* return_after_parsing() { return return_to; } void exclude_level(); void exclude_tree(); /* UNION methods */ int prepare(THD *thd, select_result *result, ulong additional_options); int exec(); int cleanup(); inline void unclean() { cleaned= 0; } void reinit_exec_mechanism(); bool check_updateable(char *db, char *table); void print(String *str); ulong init_prepare_fake_select_lex(THD *thd); int change_result(select_subselect *result, select_subselect *old_result); void set_limit(st_select_lex *values, st_select_lex *sl); friend void mysql_init_query(THD *thd, uchar *buf, uint length, bool lexonly); friend int subselect_union_engine::exec(); }; typedef class st_select_lex_unit SELECT_LEX_UNIT; /* SELECT_LEX - store information of parsed SELECT_LEX statment */ class st_select_lex: public st_select_lex_node { public: char *db, *db1, *table1, *db2, *table2; /* For outer join using .. */ Item *where, *having; /* WHERE & HAVING clauses */ Item *prep_where; /* saved WHERE clause for prepared statement processing */ /* point on lex in which it was created, used in view subquery detection */ st_lex *parent_lex; enum olap_type olap; SQL_LIST table_list, group_list; /* FROM & GROUP BY clauses */ List item_list; /* list of fields & expressions */ List interval_list, use_index, *use_index_ptr, ignore_index, *ignore_index_ptr; /* Usualy it is pointer to ftfunc_list_alloc, but in union used to create fake select_lex for calling mysql_select under results of union */ List *ftfunc_list; List ftfunc_list_alloc; JOIN *join; /* after JOIN::prepare it is pointer to corresponding JOIN */ List top_join_list; /* join list of the top level */ List *join_list; /* list for the currently parsed join */ TABLE_LIST *embedding; /* table embedding to the above list */ const char *type; /* type of select for EXPLAIN */ SQL_LIST order_list; /* ORDER clause */ List expr_list; List when_list; /* WHEN clause (expression) */ SQL_LIST *gorder_list; ha_rows select_limit, offset_limit; /* LIMIT clause parameters */ // Arrays of pointers to top elements of all_fields list Item **ref_pointer_array; /* number of items in select_list and HAVING clause used to get number bigger then can be number of entries that will be added to all item list during split_sum_func */ uint select_n_having_items; uint cond_count; /* number of arguments of and/or/xor in where/having */ enum_parsing_place parsing_place; /* where we are parsing expression */ bool with_sum_func; /* sum function indicator */ /* PS or SP cond natural joins was alredy processed with permanent arena and all additional items which we need alredy stored in it */ bool conds_processed_with_permanent_arena; ulong table_join_options; uint in_sum_expr; uint select_number; /* number of select (used for EXPLAIN) */ uint with_wild; /* item list contain '*' */ bool braces; /* SELECT ... UNION (SELECT ... ) <- this braces */ /* TRUE when having fix field called in processing of this SELECT */ bool having_fix_field; /* explicit LIMIT clause was used */ bool explicit_limit; /* there are subquery in HAVING clause => we can't close tables before query processing end even if we use temporary table */ bool subquery_in_having; bool first_execution; /* first execution in SP or PS */ bool first_cond_optimization; /* do not wrap view fields with Item_ref */ bool no_wrap_view_item; /* SELECT for SELECT command st_select_lex. Used to privent scaning item_list of non-SELECT st_select_lex (no sense find to finding reference in it (all should be in tables, it is dangerouse due to order of fix_fields calling for non-SELECTs commands (item list can be not fix_fieldsd)). This value will be assigned for primary select (sql_yac.yy) and for any subquery and UNION SELECT (sql_parse.cc mysql_new_select()) INSERT for primary st_select_lex structure of simple INSERT/REPLACE (used for name resolution, see Item_fiels & Item_ref fix_fields, FALSE for INSERT/REPLACE ... SELECT, because it's st_select_lex->table_list will be preprocessed (first table removed) before passing to handle_select) NOMATTER for other */ enum {NOMATTER_MODE, SELECT_MODE, INSERT_MODE} resolve_mode; void init_query(); void init_select(); st_select_lex_unit* master_unit(); st_select_lex_unit* first_inner_unit() { return (st_select_lex_unit*) slave; } st_select_lex* outer_select(); st_select_lex* next_select() { return (st_select_lex*) next; } st_select_lex* next_select_in_list() { return (st_select_lex*) link_next; } st_select_lex_node** next_select_in_list_addr() { return &link_next; } st_select_lex* return_after_parsing() { return master_unit()->return_after_parsing(); } void mark_as_dependent(st_select_lex *last); bool set_braces(bool value); bool inc_in_sum_expr(); uint get_in_sum_expr(); bool add_item_to_list(THD *thd, Item *item); bool add_group_to_list(THD *thd, Item *item, bool asc); bool add_ftfunc_to_list(Item_func_match *func); bool add_order_to_list(THD *thd, Item *item, bool asc); TABLE_LIST* add_table_to_list(THD *thd, Table_ident *table, LEX_STRING *alias, ulong table_options, thr_lock_type flags= TL_UNLOCK, List *use_index= 0, List *ignore_index= 0, LEX_STRING *option= 0); TABLE_LIST* get_table_list(); bool init_nested_join(THD *thd); TABLE_LIST *end_nested_join(THD *thd); TABLE_LIST *nest_last_join(THD *thd); void save_names_for_using_list(TABLE_LIST *tab1, TABLE_LIST *tab2); void add_joined_table(TABLE_LIST *table); TABLE_LIST *convert_right_join(); List* get_item_list(); List* get_use_index(); List* get_ignore_index(); ulong get_table_join_options(); void set_lock_for_tables(thr_lock_type lock_type); inline void init_order() { order_list.elements= 0; order_list.first= 0; order_list.next= (byte**) &order_list.first; } bool test_limit(); friend void mysql_init_query(THD *thd, uchar *buf, uint length, bool lexonly); st_select_lex() {} void make_empty_select() { init_query(); init_select(); } bool setup_ref_array(THD *thd, uint order_group_num); bool check_updateable(char *db, char *table); void print(THD *thd, String *str); static void print_order(String *str, ORDER *order); void print_limit(THD *thd, String *str); void fix_prepare_information(THD *thd, Item **conds); }; typedef class st_select_lex SELECT_LEX; #define ALTER_ADD_COLUMN 1 #define ALTER_DROP_COLUMN 2 #define ALTER_CHANGE_COLUMN 4 #define ALTER_ADD_INDEX 8 #define ALTER_DROP_INDEX 16 #define ALTER_RENAME 32 #define ALTER_ORDER 64 #define ALTER_OPTIONS 128 typedef struct st_alter_info { List drop_list; List alter_list; uint flags; enum enum_enable_or_disable keys_onoff; enum tablespace_op_type tablespace_op; bool is_simple; st_alter_info(){clear();} void clear(){keys_onoff= LEAVE_AS_IS;tablespace_op= NO_TABLESPACE_OP;} void reset(){drop_list.empty();alter_list.empty();clear();} } ALTER_INFO; struct st_sp_chistics { LEX_STRING comment; enum suid_behaviour suid; bool detistic; }; /* The state of the lex parsing. This is saved in the THD struct */ typedef struct st_lex { uint yylineno,yytoklen; /* Simulate lex */ LEX_YYSTYPE yylval; SELECT_LEX_UNIT unit; /* most upper unit */ SELECT_LEX select_lex; /* first SELECT_LEX */ /* current SELECT_LEX in parsing */ SELECT_LEX *current_select; /* list of all SELECT_LEX */ SELECT_LEX *all_selects_list; uchar *buf; /* The beginning of string, used by SPs */ uchar *ptr,*tok_start,*tok_end,*end_of_query; char *length,*dec,*change,*name; char *help_arg; char *backup_dir; /* For RESTORE/BACKUP */ char* to_log; /* For PURGE MASTER LOGS TO */ time_t purge_time; /* For PURGE MASTER LOGS BEFORE */ char* x509_subject,*x509_issuer,*ssl_cipher; char* found_colon; /* For multi queries - next query */ String *wild; sql_exchange *exchange; select_result *result; Item *default_value, *on_update_value; LEX_STRING *comment, name_and_length; LEX_USER *grant_user; gptr yacc_yyss,yacc_yyvs; THD *thd; CHARSET_INFO *charset; TABLE_LIST *query_tables; /* global list of all tables in this query */ /* last element next_global of previous list */ TABLE_LIST **query_tables_last; List col_list; List ref_list; List interval_list; List users_list; List columns; List key_list; List create_list; List *insert_list,field_list,value_list; List many_values; List var_list; List param_list; List view_list; // view list (list of field names in view) SQL_LIST proc_list, auxilliary_table_list, save_list; TYPELIB *interval; create_field *last_field; char *savepoint_name; // Transaction savepoint id udf_func udf; HA_CHECK_OPT check_opt; // check/repair options HA_CREATE_INFO create_info; LEX_MASTER_INFO mi; // used by CHANGE MASTER USER_RESOURCES mqh; ulong thread_id,type; enum_sql_command sql_command; thr_lock_type lock_option; enum SSL_type ssl_type; /* defined in violite.h */ enum my_lex_states next_state; enum enum_duplicates duplicates; enum enum_tx_isolation tx_isolation; enum enum_ha_read_modes ha_read_mode; enum ha_rkey_function ha_rkey_mode; enum enum_var_type option_type; enum enum_view_create_mode create_view_mode; enum enum_drop_mode drop_mode; uint uint_geom_type; uint grant, grant_tot_col, which_columns; uint fk_delete_opt, fk_update_opt, fk_match_option; uint slave_thd_opt; uint8 describe; uint8 derived_tables; uint8 create_view_algorithm; bool drop_if_exists, drop_temporary, local_file, one_shot_set; bool in_comment, ignore_space, verbose, no_write_to_binlog; /* special JOIN::prepare mode: changing of query is prohibited */ bool view_prepare_mode; bool safe_to_cache_query; bool variables_used; ALTER_INFO alter_info; /* Prepared statements SQL syntax:*/ LEX_STRING prepared_stmt_name; /* Statement name (in all queries) */ /* Prepared statement query text or name of variable that holds the prepared statement (in PREPARE ... queries) */ LEX_STRING prepared_stmt_code; /* If true, prepared_stmt_code is a name of variable that holds the query */ bool prepared_stmt_code_is_varref; /* Names of user variables holding parameters (in EXECUTE) */ List prepared_stmt_params; sp_head *sphead; sp_name *spname; bool sp_lex_in_use; /* Keep track on lex usage in SPs for error handling */ sp_pcontext *spcont; HASH spfuns; /* Called functions */ st_sp_chistics sp_chistics; bool only_view; /* used for SHOW CREATE TABLE/VIEW */ /* field_list was created for view and should be removed before PS/SP rexecuton */ bool empty_field_list_on_rset; st_lex() { bzero((char *)&spfuns, sizeof(spfuns)); } ~st_lex() { if (spfuns.array.buffer) hash_free(&spfuns); } inline void uncacheable(uint8 cause) { safe_to_cache_query= 0; /* There are no sense to mark select_lex and union fields of LEX, but we should merk all subselects as uncacheable from current till most upper */ SELECT_LEX *sl; SELECT_LEX_UNIT *un; for (sl= current_select, un= sl->master_unit(); un != &unit; sl= sl->outer_select(), un= sl->master_unit()) { sl->uncacheable|= cause; un->uncacheable|= cause; } } TABLE_LIST *unlink_first_table(bool *link_to_local); void link_first_table_back(TABLE_LIST *first, bool link_to_local); void first_lists_tables_same(); bool can_be_merged(); bool can_use_merged(); bool only_view_structure(); } LEX; struct st_lex_local: public st_lex { static void *operator new(size_t size) { return (void*) sql_alloc((uint) size); } static void *operator new(size_t size, MEM_ROOT *mem_root) { return (void*) alloc_root(mem_root, (uint) size); } static void operator delete(void *ptr,size_t size) {} }; void lex_init(void); void lex_free(void); void lex_start(THD *thd, uchar *buf,uint length); void lex_end(LEX *lex); extern pthread_key(LEX*,THR_LEX); #define current_lex (current_thd->lex)