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new SELECT_LEX structure

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This commit is contained in:
bell@sanja.is.com.ua 2002-05-07 00:04:16 +03:00
parent 06ed215c37
commit 494184ff5f
11 changed files with 372 additions and 111 deletions
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10
mysql-test/r/derived.result
View File

@ -1,4 +1,4 @@
drop table if exists t1,t2;
drop table if exists t1,t2,t3;
CREATE TABLE t1 (a int not null, b char (10) not null);
insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
CREATE TABLE t2 (a int not null, b char (10) not null);
@ -7,4 +7,10 @@ select t1.a,t3.y from t1,(select a as y from t2 where b='c') as t3 where t1.a
a y
3 3
3 3
drop table if exists t1.t2;
CREATE TABLE t3 (a int not null, b char (10) not null);
insert into t3 values (3,'f'),(4,'y'),(5,'z'),(6,'c');
select t1.a,t4.y from t1,(select t2.a as y from t2,(select t3.b from t3 where t3.a>3) as t5 where t2.b=t5.b) as t4 where t1.a = t4.y;
a y
3 3
3 3
drop table if exists t1.t2,t3;

7
mysql-test/t/derived.test
View File

@ -1,7 +1,10 @@
drop table if exists t1,t2;
drop table if exists t1,t2,t3;
CREATE TABLE t1 (a int not null, b char (10) not null);
insert into t1 values(1,'a'),(2,'b'),(3,'c'),(3,'c');
CREATE TABLE t2 (a int not null, b char (10) not null);
insert into t2 values (3,'c'),(4,'d'),(5,'f'),(6,'e');
select t1.a,t3.y from t1,(select a as y from t2 where b='c') as t3 where t1.a = t3.y;
drop table if exists t1.t2;
CREATE TABLE t3 (a int not null, b char (10) not null);
insert into t3 values (3,'f'),(4,'y'),(5,'z'),(6,'c');
select t1.a,t4.y from t1,(select t2.a as y from t2,(select t3.b from t3 where t3.a>3) as t5 where t2.b=t5.b) as t4 where t1.a = t4.y;
drop table if exists t1.t2,t3;

6
sql/mysql_priv.h
View File

@ -291,7 +291,7 @@ bool mysql_rename_tables(THD *thd, TABLE_LIST *table_list);
bool mysql_change_db(THD *thd,const char *name);
void mysql_parse(THD *thd,char *inBuf,uint length);
void mysql_init_select(LEX *lex);
bool mysql_new_select(LEX *lex);
bool mysql_new_select(LEX *lex, bool move_down);
void mysql_init_multi_delete(LEX *lex);
void init_max_user_conn(void);
void free_max_user_conn(void);
@ -360,8 +360,8 @@ int handle_select(THD *thd, LEX *lex, select_result *result);
int mysql_select(THD *thd,TABLE_LIST *tables,List<Item> &list,COND *conds,
ORDER *order, ORDER *group,Item *having,ORDER *proc_param,
ulong select_type,select_result *result);
int mysql_union(THD *thd,LEX *lex,select_result *result);
int mysql_derived(THD *thd,LEX *lex,SELECT_LEX *s, TABLE_LIST *t);
int mysql_union(THD *thd, LEX *lex,select_result *result);
int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *s, TABLE_LIST *t);
Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
Item_result_field ***copy_func, Field **from_field,
bool group,bool modify_item);

21
sql/sql_class.h
View File

@ -706,19 +706,28 @@ class Table_ident :public Sql_alloc {
public:
LEX_STRING db;
LEX_STRING table;
SELECT_LEX *sel;
inline Table_ident(LEX_STRING db_arg,LEX_STRING table_arg,bool force)
:table(table_arg), sel((SELECT_LEX *)0)
SELECT_LEX_UNIT *sel;
inline Table_ident(LEX_STRING db_arg, LEX_STRING table_arg, bool force)
:table(table_arg), sel((SELECT_LEX_UNIT *)0)
{
if (!force && (current_thd->client_capabilities & CLIENT_NO_SCHEMA))
db.str=0;
else
db= db_arg;
}
inline Table_ident(LEX_STRING table_arg) :table(table_arg), sel((SELECT_LEX *)0) {db.str=0;}
inline Table_ident(SELECT_LEX *s) : sel(s) {db.str=0; table.str=(char *)""; table.length=0;}
inline Table_ident(LEX_STRING table_arg)
:table(table_arg), sel((SELECT_LEX_UNIT *)0)
{
db.str=0;
}
inline Table_ident(SELECT_LEX_UNIT *s) : sel(s)
{
db.str=0; table.str=(char *)""; table.length=0;
}
inline void change_db(char *db_name)
{ db.str= db_name; db.length=(uint) strlen(db_name); }
{
db.str= db_name; db.length= (uint) strlen(db_name);
}
};
// this is needed for user_vars hash

19
sql/sql_derived.cc
View File

@ -28,21 +28,25 @@
static const char *any_db="*any*"; // Special symbol for check_access
int mysql_derived(THD *thd, LEX *lex,SELECT_LEX *s, TABLE_LIST *t)
int mysql_derived(THD *thd, LEX *lex, SELECT_LEX_UNIT *s, TABLE_LIST *t)
{
SELECT_LEX *sl=s;
/*
TODO: make derived tables with union inside (now only 1 SELECT may be
procesed)
*/
SELECT_LEX *sl= (SELECT_LEX*)s->slave;
List<Item> item_list;
TABLE *table;
int res;
select_union *derived_result;
TABLE_LIST *tables=(TABLE_LIST *)sl->table_list.first;
TABLE_LIST *tables= (TABLE_LIST *)sl->table_list.first;
TMP_TABLE_PARAM tmp_table_param;
DBUG_ENTER("mysql_derived");
if (tables)
res=check_table_access(thd,SELECT_ACL, tables);
res= check_table_access(thd,SELECT_ACL, tables);
else
res=check_access(thd, SELECT_ACL, any_db);
res= check_access(thd, SELECT_ACL, any_db);
if (res)
DBUG_RETURN(-1);
@ -52,7 +56,7 @@ int mysql_derived(THD *thd, LEX *lex,SELECT_LEX *s, TABLE_LIST *t)
{
if (cursor->derived)
{
res=mysql_derived(thd,lex,(SELECT_LEX *)cursor->derived,cursor);
res=mysql_derived(thd, lex, (SELECT_LEX_UNIT *)cursor->derived, cursor);
if (res) DBUG_RETURN(res);
}
}
@ -103,9 +107,8 @@ int mysql_derived(THD *thd, LEX *lex,SELECT_LEX *s, TABLE_LIST *t)
{
t->real_name=table->real_name;
t->table=table;
sl->prev->next=sl->next;
sl->exclude();
t->derived=(SELECT_LEX *)0; // just in case ...
if (!sl->next) lex->last_select = sl;
}
}
delete derived_result;

115
sql/sql_lex.cc
View File

@ -879,3 +879,118 @@ int yylex(void *arg)
}
}
}
/*
st_select_lex structures initialisations
*/
void st_select_lex_node::init_query()
{
next= master= slave= link_next= 0;
prev= link_prev= 0;
}
void st_select_lex_node::init_select()
{
order_list.elements= 0;
order_list.first= 0;
order_list.next= (byte**) &order_list.first;
select_limit= offset_limit= 0;
}
void st_select_lex_unit::init_query()
{
st_select_lex_node::init_query();
global_parameters= this;
select_limit_cnt= offset_limit_cnt= 0;
}
void st_select_lex::init_query()
{
st_select_lex_node::init_query();
table_list.elements= 0;
table_list.first= 0;
table_list.next= (byte**) &table_list.first;
item_list.empty();
}
void st_select_lex::init_select()
{
st_select_lex_node::init_select();
group_list.elements= 0;
group_list.first= 0;
group_list.next= (byte**) &group_list.first;
options= 0;
where= having= 0;
when_list.empty();
expr_list.empty();
interval_list.empty();
use_index.empty();
ftfunc_list.empty();
linkage=UNSPECIFIED_TYPE;
}
/*
st_select_lex structures linking
*/
/* include on level down */
void st_select_lex_node::include_down(st_select_lex_node *upper)
{
if ((next= upper->slave))
next->prev= &next;
prev= &upper->slave;
upper->slave= this;
master= upper;
}
/* include neighbour (on same level) */
void st_select_lex_node::include_neighbour(st_select_lex_node *before)
{
if ((next= before->next))
next->prev= &next;
prev= &before->next;
before->next= this;
master= before->master;
}
/* including in global SELECT_LEX list */
void st_select_lex_node::include_global(st_select_lex_node **plink)
{
if ((link_next= *plink))
link_next->link_prev= &link_next;
link_prev= plink;
*plink= this;
}
//excluding from global list (internal function)
void st_select_lex_node::fast_exclude()
{
if(link_prev)
{
if ((*link_prev= link_next))
link_next->link_prev= link_prev;
// Remove slave structure
for (; slave; slave= slave->next)
slave->fast_exclude();
}
}
/*
excluding select_lex structure (except first (first select can't be
deleted, because it is most upper select))
*/
void st_select_lex_node::exclude()
{
//exclude from global list
fast_exclude();
//exclude from other structures
if ((*prev= next))
next->prev= prev;
/*
We do not need following statements, because prev pointer of first
list element point to master->slave
if (master->slave == this)
master->slave= next;
*/
}

149
sql/sql_lex.h
View File

@ -103,28 +103,143 @@ typedef struct st_lex_master_info
} LEX_MASTER_INFO;
enum sub_select_type {UNSPECIFIED_TYPE,UNION_TYPE, INTERSECT_TYPE, EXCEPT_TYPE, NOT_A_SELECT, DERIVED_TABLE_TYPE};
enum sub_select_type {UNSPECIFIED_TYPE,UNION_TYPE, INTERSECT_TYPE,
EXCEPT_TYPE, GLOBAL_OPTIONS_TYPE, DERIVED_TABLE_TYPE};
/* The state of the lex parsing for selects */
/*
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)
for example for following query:
typedef struct st_select_lex {
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
select1 select2 select3
|^^ |^
s||| ||master
l||| |+---------------------------------+
a||| +---------------------------------+|
v|||master slave ||
e||+-------------------------+ ||
V| neighbor | V|
unit 1.1<==================>unit1.2 unit2.1
select1.1.1 select 1.1.2 select1.2.1 select2.1.1 select2.1.2
|^
||
V|
unit2.1.1.1
select2.1.1.1.1
relation in main unit will be following:
main unit
|^^^
||||
|||+------------------------------+
||+--------------+ |
slave||master | |
V| neighbor | neighbor |
select1<========>select2<========>select3
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_select_lex_node {
enum sub_select_type linkage;
char *db,*db1,*table1,*db2,*table2; /* For outer join using .. */
Item *where,*having;
ha_rows select_limit,offset_limit;
st_select_lex_node *next, **prev, /* neighbor list */
*master, *slave, /* vertical links */
*link_next, **link_prev; /* list of whole SELECT_LEX */
SQL_LIST order_list; /* ORDER clause */
ha_rows select_limit, offset_limit; /* LIMIT clause parameters */
void init_query();
void init_select();
void include_down(st_select_lex_node *upper);
void include_neighbour(st_select_lex_node *before);
void include_global(st_select_lex_node **plink);
void exclude();
private:
void fast_exclude();
};
/*
SELECT_LEX_UNIT - unit of selects (UNION, INTERSECT, ...) group
SELECT_LEXs
*/
struct st_select_lex_unit: public st_select_lex_node {
/*
Pointer to 'last' select or pointer to unit where stored
global parameters for union
*/
st_select_lex_node *global_parameters;
/* LIMIT clause runtime counters */
ha_rows select_limit_cnt, offset_limit_cnt;
void init_query();
};
typedef struct st_select_lex_unit SELECT_LEX_UNIT;
/*
SELECT_LEX - store information of parsed SELECT_LEX statment
*/
struct st_select_lex: public st_select_lex_node {
char *db, *db1, *table1, *db2, *table2; /* For outer join using .. */
Item *where, *having; /* WHERE & HAVING clauses */
ulong options;
List<List_item> expr_list;
List<List_item> when_list;
SQL_LIST order_list,table_list,group_list;
List<Item> item_list;
List<String> interval_list,use_index, *use_index_ptr,
List<List_item> when_list; /* WHEN clause */
SQL_LIST table_list, group_list; /* FROM & GROUP BY clauses */
List<Item> item_list; /* list of fields & expressions */
List<String> interval_list, use_index, *use_index_ptr,
ignore_index, *ignore_index_ptr;
List<Item_func_match> ftfunc_list;
uint in_sum_expr, sort_default;
bool create_refs, braces;
st_select_lex *next, *prev;
} SELECT_LEX;
bool create_refs,
braces; /* SELECT ... UNION (SELECT ... ) <- this braces */
void init_query();
void init_select();
};
typedef struct st_select_lex SELECT_LEX;
class Set_option :public Sql_alloc {
public:
@ -137,13 +252,15 @@ public:
:name(par_name), item(par_item), name_length(length), type(par_type) {}
};
/* 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 select_lex, *select, *last_select;
SELECT_LEX_UNIT unit; /* most upper unit */
SELECT_LEX select_lex, /* first SELECT_LEX */
/* current SELECT_LEX in parsing */
*select;
uchar *ptr,*tok_start,*tok_end,*end_of_query;
char *length,*dec,*change,*name;
char *backup_dir; /* For RESTORE/BACKUP */

88
sql/sql_parse.cc
View File

@ -1240,8 +1240,10 @@ mysql_execute_command(void)
{
for (TABLE_LIST *cursor= tables;
cursor;
cursor=cursor->next)
if (cursor->derived && mysql_derived(thd,lex,(SELECT_LEX *)cursor->derived,cursor))
cursor= cursor->next)
if (cursor->derived && mysql_derived(thd, lex,
(SELECT_LEX_UNIT *)cursor->derived,
cursor))
DBUG_VOID_RETURN;
}
if ((lex->select_lex.next && create_total_list(thd,lex,&tables)) ||
@ -2664,18 +2666,19 @@ static void
mysql_init_query(THD *thd)
{
DBUG_ENTER("mysql_init_query");
thd->lex.select_lex.item_list.empty();
thd->lex.unit.init_query();
thd->lex.select_lex.init_query();
thd->lex.unit.slave= &thd->lex.select_lex;
thd->lex.select_lex.master= &thd->lex.unit;
thd->lex.select_lex.prev= &thd->lex.unit.slave;
thd->lex.value_list.empty();
thd->lex.select_lex.table_list.elements=0;
thd->free_list=0; thd->lex.union_option=0;
thd->lex.select = thd->lex.last_select = &thd->lex.select_lex;
thd->lex.select_lex.table_list.first=0;
thd->lex.select_lex.table_list.next= (byte**) &thd->lex.select_lex.table_list.first;
thd->lex.select_lex.next=0;
thd->fatal_error=0; // Safety
thd->last_insert_id_used=thd->query_start_used=thd->insert_id_used=0;
thd->sent_row_count=thd->examined_row_count=0;
thd->safe_to_cache_query=1;
thd->free_list= 0;
thd->lex.union_option= 0;
thd->lex.select= &thd->lex.select_lex;
thd->fatal_error= 0; // Safety
thd->last_insert_id_used= thd->query_start_used= thd->insert_id_used=0;
thd->sent_row_count= thd->examined_row_count= 0;
thd->safe_to_cache_query= 1;
DBUG_VOID_RETURN;
}
@ -2683,53 +2686,52 @@ void
mysql_init_select(LEX *lex)
{
SELECT_LEX *select_lex = lex->select;
select_lex->where=select_lex->having=0;
select_lex->init_select();
select_lex->select_limit=lex->thd->default_select_limit;
select_lex->offset_limit=0;
select_lex->options=0;
select_lex->linkage=UNSPECIFIED_TYPE;
lex->exchange = 0;
lex->proc_list.first=0;
select_lex->order_list.elements=select_lex->group_list.elements=0;
select_lex->order_list.first=0;
select_lex->order_list.next= (byte**) &select_lex->order_list.first;
select_lex->group_list.first=0;
select_lex->group_list.next= (byte**) &select_lex->group_list.first;
select_lex->next = select_lex->prev = (SELECT_LEX *)NULL;
}
bool
mysql_new_select(LEX *lex)
mysql_new_select(LEX *lex, bool move_down)
{
SELECT_LEX *select_lex = (SELECT_LEX *) lex->thd->calloc(sizeof(SELECT_LEX));
if (!select_lex)
return 1;
lex->select=lex->last_select;
lex->select->next=select_lex;
lex->select=lex->last_select=select_lex;
select_lex->table_list.next= (byte**) &select_lex->table_list.first;
select_lex->item_list.empty();
select_lex->when_list.empty();
select_lex->expr_list.empty();
select_lex->interval_list.empty();
select_lex->use_index.empty();
select_lex->ftfunc_list.empty();
select_lex->init_query();
select_lex->init_select();
if (move_down)
{
/* first select_lex of subselect or derived table */
SELECT_LEX_UNIT *unit=
(SELECT_LEX_UNIT *) lex->thd->calloc(sizeof(SELECT_LEX_UNIT));
if (!unit)
return 1;
unit->init_query();
unit->init_select();
unit->include_down(lex->select);
select_lex->include_down(unit);
}
else
select_lex->include_neighbour(lex->select);
select_lex->include_global(&lex->select->link_next);
lex->select= select_lex;
return 0;
}
void mysql_init_multi_delete(LEX *lex)
{
lex->sql_command = SQLCOM_DELETE_MULTI;
lex->sql_command= SQLCOM_DELETE_MULTI;
mysql_init_select(lex);
lex->select->select_limit=HA_POS_ERROR;
lex->auxilliary_table_list=lex->select_lex.table_list;
lex->select->table_list.elements=0;
lex->select->table_list.first=0;
lex->select->table_list.next= (byte**) &(lex->select->table_list.first);
lex->select->select_limit= HA_POS_ERROR;
lex->auxilliary_table_list= lex->select_lex.table_list;
lex->select->init_query();
}
void
mysql_parse(THD *thd,char *inBuf,uint length)
mysql_parse(THD *thd, char *inBuf, uint length)
{
DBUG_ENTER("mysql_parse");
@ -3159,7 +3161,7 @@ TABLE_LIST *add_table_to_list(Table_ident *table, LEX_STRING *alias,
ptr->real_name_length=table->table.length;
ptr->lock_type=flags;
ptr->updating=updating;
ptr->derived=(SELECT_LEX *)table->sel;
ptr->derived= (SELECT_LEX_UNIT *) table->sel;
if (use_index)
ptr->use_index=(List<String> *) thd->memdup((gptr) use_index,
sizeof(*use_index));
@ -3204,8 +3206,8 @@ static bool create_total_list(THD *thd, LEX *lex, TABLE_LIST **result)
SELECT_LEX *sl;
TABLE_LIST **new_table_list= result, *aux;
*new_table_list=0; // end result list
for (sl= &lex->select_lex; sl; sl=sl->next)
*new_table_list= 0; // end result list
for (sl= &lex->select_lex; sl; sl= (SELECT_LEX *) sl->next)
{
if (sl->order_list.first && sl->next && !sl->braces)
{

28
sql/sql_union.cc
View File

@ -43,8 +43,8 @@ int mysql_union(THD *thd, LEX *lex,select_result *result)
/* Fix tables 'to-be-unioned-from' list to point at opened tables */
last_sl= &lex->select_lex;
for (sl= last_sl;
sl && sl->linkage != NOT_A_SELECT;
last_sl=sl, sl=sl->next)
sl && sl->linkage != GLOBAL_OPTIONS_TYPE;
last_sl= sl, sl= (SELECT_LEX *) sl->next)
{
for (TABLE_LIST *cursor= (TABLE_LIST *)sl->table_list.first;
cursor;
@ -133,7 +133,7 @@ int mysql_union(THD *thd, LEX *lex,select_result *result)
}
union_result->save_time_stamp=!describe;
for (sl= &lex->select_lex; sl; sl=sl->next)
for (sl= &lex->select_lex; sl; sl= (SELECT_LEX*) sl->next)
{
lex->select=sl;
thd->offset_limit=sl->offset_limit;
@ -143,15 +143,19 @@ int mysql_union(THD *thd, LEX *lex,select_result *result)
if (thd->select_limit == HA_POS_ERROR)
sl->options&= ~OPTION_FOUND_ROWS;
res=mysql_select(thd, (describe && sl->linkage==NOT_A_SELECT) ? first_table : (TABLE_LIST*) sl->table_list.first,
sl->item_list,
sl->where,
(sl->braces) ? (ORDER *)sl->order_list.first : (ORDER *) 0,
(ORDER*) sl->group_list.first,
sl->having,
(ORDER*) NULL,
sl->options | thd->options | SELECT_NO_UNLOCK | ((describe) ? SELECT_DESCRIBE : 0),
union_result);
res= mysql_select(thd,
(describe && sl->linkage==GLOBAL_OPTIONS_TYPE) ?
first_table : (TABLE_LIST*) sl->table_list.first,
sl->item_list,
sl->where,
(sl->braces) ?
(ORDER *)sl->order_list.first : (ORDER *) 0,
(ORDER*) sl->group_list.first,
sl->having,
(ORDER*) NULL,
sl->options | thd->options |
SELECT_NO_UNLOCK | ((describe) ? SELECT_DESCRIBE : 0),
union_result);
if (res)
goto exit;
}

24
sql/sql_yacc.yy
View File

@ -2155,21 +2155,22 @@ join_table:
| '(' SELECT_SYM select_part3 ')' opt_table_alias
{
LEX *lex=Lex;
lex->select=lex->select->prev;
if (!($$=add_table_to_list(new Table_ident(Lex->last_select),$5,0,TL_UNLOCK)))
SELECT_LEX_UNIT *unit= (SELECT_LEX_UNIT*) lex->select->master;
lex->select= (SELECT_LEX*) unit->master;
if (!($$= add_table_to_list(new Table_ident(unit),
$5,0,TL_UNLOCK)))
YYABORT;
}
select_part3:
{
LEX *lex=Lex;
lex->derived_tables=true;
SELECT_LEX *tmp=lex->select;
if (lex->select->linkage == NOT_A_SELECT || mysql_new_select(lex))
LEX *lex= Lex;
lex->derived_tables= true;
if (lex->select->linkage == GLOBAL_OPTIONS_TYPE ||
mysql_new_select(lex, 1))
YYABORT;
mysql_init_select(lex);
lex->select->linkage=DERIVED_TABLE_TYPE;
lex->select->prev=tmp;
lex->select->linkage= DERIVED_TABLE_TYPE;
}
select_options select_item_list select_intoto
@ -3809,7 +3810,8 @@ union_list:
net_printf(&lex->thd->net, ER_WRONG_USAGE,"UNION","INTO");
YYABORT;
}
if (lex->select->linkage == NOT_A_SELECT || mysql_new_select(lex))
if (lex->select->linkage == GLOBAL_OPTIONS_TYPE ||
mysql_new_select(lex, 0))
YYABORT;
lex->select->linkage=UNION_TYPE;
}
@ -3824,10 +3826,10 @@ optional_order_or_limit:
|
{
LEX *lex=Lex;
if (!lex->select->braces || mysql_new_select(lex))
if (!lex->select->braces || mysql_new_select(lex, 0))
YYABORT;
mysql_init_select(lex);
lex->select->linkage=NOT_A_SELECT;
lex->select->linkage= GLOBAL_OPTIONS_TYPE;
lex->select->select_limit=lex->thd->default_select_limit;
}
opt_order_clause limit_clause

16
sql/table.h
View File

@ -139,18 +139,18 @@ typedef struct st_table_list {
struct st_table_list *next;
char *db,*name,*real_name;
uint32 db_length, real_name_length;
Item *on_expr; /* Used with outer join */
struct st_table_list *natural_join; /* natural join on this table*/
Item *on_expr; /* Used with outer join */
struct st_table_list *natural_join; /* natural join on this table*/
/* ... join ... USE INDEX ... IGNORE INDEX */
List<String> *use_index,*ignore_index;
List<String> *use_index, *ignore_index;
TABLE *table;
GRANT_INFO grant;
thr_lock_type lock_type;
uint outer_join; /* Which join type */
bool straight; /* optimize with prev table */
bool updating; /* for replicate-do/ignore table */
bool shared; /* Used twice in union */
void *derived;
uint outer_join; /* Which join type */
bool straight; /* optimize with prev table */
bool updating; /* for replicate-do/ignore table */
bool shared; /* Used twice in union */
void *derived; /* SELECT_LEX_UNIT of derived table */
} TABLE_LIST;
typedef struct st_changed_table_list {