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Merge epotemkin@bk-internal.mysql.com:/home/bk/mysql-5.0-opt

Browse source 
into  moonbone.local:/mnt/gentoo64/work/27321-bug-5.0-opt-mysql
This commit is contained in:
evgen@moonbone.local 2007-04-15 08:41:35 +04:00
commit 922a5a969c
8 changed files with 245 additions and 87 deletions
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70
mysql-test/r/subselect.result
View file

@ -48,7 +48,7 @@ id select_type table type possible_keys key key_len ref rows Extra
3 DEPENDENT SUBQUERY NULL NULL NULL NULL NULL NULL NULL No tables used
2 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1276 Field or reference 'a' of SELECT #3 was resolved in SELECT #1
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
Note 1276 Field or reference 'b.a' of SELECT #3 was resolved in SELECT #1
Note 1003 select 1 AS `1` from (select 1 AS `a`) `b` having ((select '1' AS `a`) = 1)
SELECT 1 FROM (SELECT 1 as a) as b HAVING (SELECT a)=1;
@ -330,7 +330,7 @@ patient_uq clinic_uq
explain extended select * from t6 where exists (select * from t7 where uq = clinic_uq);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t6 ALL NULL NULL NULL NULL 4 Using where
2 DEPENDENT SUBQUERY t7 eq_ref PRIMARY PRIMARY 4 t6.clinic_uq 1 Using where; Using index
2 DEPENDENT SUBQUERY t7 eq_ref PRIMARY PRIMARY 4 test.t6.clinic_uq 1 Using index
Warnings:
Note 1276 Field or reference 'test.t6.clinic_uq' of SELECT #2 was resolved in SELECT #1
Note 1003 select `test`.`t6`.`patient_uq` AS `patient_uq`,`test`.`t6`.`clinic_uq` AS `clinic_uq` from `test`.`t6` where exists(select 1 AS `Not_used` from `test`.`t7` where (`test`.`t7`.`uq` = `test`.`t6`.`clinic_uq`))
@ -1741,7 +1741,7 @@ Note 1003 select `test`.`t1`.`id` AS `id`,`test`.`t1`.`text` AS `text` from `tes
explain extended select * from t1 as tt where not exists (select id from t1 where id < 8 and (id = tt.id or id is null) having id is not null);
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY tt ALL NULL NULL NULL NULL 12 Using where
2 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 tt.id 1 Using where; Using index
2 DEPENDENT SUBQUERY t1 eq_ref PRIMARY PRIMARY 4 test.tt.id 1 Using where; Using index
Warnings:
Note 1276 Field or reference 'test.tt.id' of SELECT #2 was resolved in SELECT #1
Note 1003 select `test`.`tt`.`id` AS `id`,`test`.`tt`.`text` AS `text` from `test`.`t1` `tt` where (not(exists(select `test`.`t1`.`id` AS `id` from `test`.`t1` where ((`test`.`t1`.`id` < 8) and (`test`.`t1`.`id` = `test`.`tt`.`id`)) having (`test`.`t1`.`id` is not null))))
@ -3924,6 +3924,70 @@ c a (SELECT GROUP_CONCAT(COUNT(a)+1) FROM t2 WHERE m = a)
3 3 4
1 4 2,2
DROP table t1,t2;
CREATE TABLE t1 (a int, b INT, d INT, c CHAR(10) NOT NULL, PRIMARY KEY (a, b));
INSERT INTO t1 VALUES (1,1,0,'a'), (1,2,0,'b'), (1,3,0,'c'), (1,4,0,'d'),
(1,5,0,'e'), (2,1,0,'f'), (2,2,0,'g'), (2,3,0,'h'), (3,4,0,'i'), (3,3,0,'j'),
(3,2,0,'k'), (3,1,0,'l'), (1,9,0,'m'), (1,0,10,'n'), (2,0,5,'o'), (3,0,7,'p');
SELECT a, MAX(b),
(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b + 0)) as test
FROM t1 GROUP BY a;
a MAX(b) test
1 9 m
2 3 h
3 4 i
SELECT a x, MAX(b),
(SELECT t.c FROM t1 AS t WHERE x=t.a AND t.b=MAX(t1.b + 0)) as test
FROM t1 GROUP BY a;
x MAX(b) test
1 9 m
2 3 h
3 4 i
SELECT a, AVG(b),
(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=AVG(t1.b)) AS test
FROM t1 WHERE t1.d=0 GROUP BY a;
a AVG(b) test
1 4.0000 d
2 2.0000 g
3 2.5000 NULL
SELECT tt.a,
(SELECT (SELECT c FROM t1 as t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
LIMIT 1) FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test
FROM t1 as tt;
a test
1 n
1 n
1 n
1 n
1 n
1 n
1 n
2 o
2 o
2 o
2 o
3 p
3 p
3 p
3 p
3 p
SELECT tt.a,
(SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
LIMIT 1)
FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test
FROM t1 as tt GROUP BY tt.a;
a test
1 n
2 o
3 p
SELECT tt.a, MAX(
(SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
LIMIT 1)
FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1)) as test
FROM t1 as tt GROUP BY tt.a;
a test
1 n
2 o
3 p
CREATE TABLE t1 (a int, b int);
INSERT INTO t1 VALUES (2,22),(1,11),(2,22);
SELECT a FROM t1 WHERE (SELECT COUNT(b) FROM DUAL) > 0 GROUP BY a;

4
mysql-test/r/subselect3.result
View file

@ -432,7 +432,7 @@ alter table t1 add index idx(oref,ie);
explain select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 7
2 DEPENDENT SUBQUERY t1 ref_or_null idx idx 10 t2.oref,func 4 Using where; Using index; Full scan on NULL key
2 DEPENDENT SUBQUERY t1 ref_or_null idx idx 10 test.t2.oref,func 4 Using where; Using index; Full scan on NULL key
select oref, a, a in (select ie from t1 where oref=t2.oref) Z from t2;
oref a Z
ee NULL NULL
@ -457,7 +457,7 @@ group by grp having min(ie) > 1) Z
from t2;
id select_type table type possible_keys key key_len ref rows Extra
1 PRIMARY t2 ALL NULL NULL NULL NULL 7
2 DEPENDENT SUBQUERY t1 ref idx idx 5 t2.oref 2 Using where; Using temporary; Using filesort
2 DEPENDENT SUBQUERY t1 ref idx idx 5 test.t2.oref 2 Using where; Using temporary; Using filesort
select oref, a,
a in (select min(ie) from t1 where oref=t2.oref
group by grp having min(ie) > 1) Z

35
mysql-test/t/subselect.test
View file

@ -2783,6 +2783,41 @@ SELECT COUNT(*) c, a,
DROP table t1,t2;
#
# Bug#27321: Wrong subquery result in a grouping select
#
CREATE TABLE t1 (a int, b INT, d INT, c CHAR(10) NOT NULL, PRIMARY KEY (a, b));
INSERT INTO t1 VALUES (1,1,0,'a'), (1,2,0,'b'), (1,3,0,'c'), (1,4,0,'d'),
(1,5,0,'e'), (2,1,0,'f'), (2,2,0,'g'), (2,3,0,'h'), (3,4,0,'i'), (3,3,0,'j'),
(3,2,0,'k'), (3,1,0,'l'), (1,9,0,'m'), (1,0,10,'n'), (2,0,5,'o'), (3,0,7,'p');
SELECT a, MAX(b),
(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b + 0)) as test
FROM t1 GROUP BY a;
SELECT a x, MAX(b),
(SELECT t.c FROM t1 AS t WHERE x=t.a AND t.b=MAX(t1.b + 0)) as test
FROM t1 GROUP BY a;
SELECT a, AVG(b),
(SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=AVG(t1.b)) AS test
FROM t1 WHERE t1.d=0 GROUP BY a;
SELECT tt.a,
(SELECT (SELECT c FROM t1 as t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
LIMIT 1) FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test
FROM t1 as tt;
SELECT tt.a,
(SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
LIMIT 1)
FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1) as test
FROM t1 as tt GROUP BY tt.a;
SELECT tt.a, MAX(
(SELECT (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.d=MAX(t1.b + tt.a)
LIMIT 1)
FROM t1 WHERE t1.a=tt.a GROUP BY a LIMIT 1)) as test
FROM t1 as tt GROUP BY tt.a;
#
# Bug #27348: SET FUNCTION used in a subquery from WHERE condition
#

3
mysql-test/t/subselect3.test
View file

@ -507,9 +507,6 @@ SELECT a, MAX(b), (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=MAX(t1.b))
SELECT * FROM t1 GROUP by t1.a
HAVING (MAX(t1.b) > (SELECT MAX(t2.b) FROM t2 WHERE t2.c < t1.c
HAVING MAX(t2.b+t1.a) < 10));
#FIXME: Enable this test after fixing bug #27321
#SELECT a, AVG(b), (SELECT t.c FROM t1 AS t WHERE t1.a=t.a AND t.b=AVG(t1.b))
# AS test FROM t1 GROUP BY a;
SELECT a,b,c FROM t1 WHERE b in (9,3,4) ORDER BY b,c;

83
sql/item.cc
View file

@ -1610,7 +1610,7 @@ void Item_ident_for_show::make_field(Send_field *tmp_field)
Item_field::Item_field(Field *f)
:Item_ident(0, NullS, *f->table_name, f->field_name),
item_equal(0), no_const_subst(0),
have_privileges(0), any_privileges(0), fixed_as_field(0)
have_privileges(0), any_privileges(0)
{
set_field(f);
/*
@ -1624,7 +1624,7 @@ Item_field::Item_field(THD *thd, Name_resolution_context *context_arg,
Field *f)
:Item_ident(context_arg, f->table->s->db, *f->table_name, f->field_name),
item_equal(0), no_const_subst(0),
have_privileges(0), any_privileges(0), fixed_as_field(0)
have_privileges(0), any_privileges(0)
{
/*
We always need to provide Item_field with a fully qualified field
@ -1663,7 +1663,7 @@ Item_field::Item_field(Name_resolution_context *context_arg,
const char *field_name_arg)
:Item_ident(context_arg, db_arg,table_name_arg,field_name_arg),
field(0), result_field(0), item_equal(0), no_const_subst(0),
have_privileges(0), any_privileges(0), fixed_as_field(0)
have_privileges(0), any_privileges(0)
{
SELECT_LEX *select= current_thd->lex->current_select;
collation.set(DERIVATION_IMPLICIT);
@ -1679,8 +1679,7 @@ Item_field::Item_field(THD *thd, Item_field *item)
item_equal(item->item_equal),
no_const_subst(item->no_const_subst),
have_privileges(item->have_privileges),
any_privileges(item->any_privileges),
fixed_as_field(item->fixed_as_field)
any_privileges(item->any_privileges)
{
collation.set(DERIVATION_IMPLICIT);
}
@ -3447,6 +3446,7 @@ Item_field::fix_outer_field(THD *thd, Field **from_field, Item **reference)
Item **ref= (Item **) not_found_item;
SELECT_LEX *current_sel= (SELECT_LEX *) thd->lex->current_select;
Name_resolution_context *outer_context= 0;
SELECT_LEX *select;
/* Currently derived tables cannot be correlated */
if (current_sel->master_unit()->first_select()->linkage !=
DERIVED_TABLE_TYPE)
@ -3455,7 +3455,7 @@ Item_field::fix_outer_field(THD *thd, Field **from_field, Item **reference)
outer_context;
outer_context= outer_context->outer_context)
{
SELECT_LEX *select= outer_context->select_lex;
select= outer_context->select_lex;
Item_subselect *prev_subselect_item=
last_checked_context->select_lex->master_unit()->item;
last_checked_context= outer_context;
@ -3498,45 +3498,28 @@ Item_field::fix_outer_field(THD *thd, Field **from_field, Item **reference)
}
if (*from_field != view_ref_found)
{
prev_subselect_item->used_tables_cache|= (*from_field)->table->map;
prev_subselect_item->const_item_cache= 0;
set_field(*from_field);
if (!last_checked_context->select_lex->having_fix_field &&
!fixed_as_field)
select->group_list.elements)
{
Item_outer_ref *rf;
Query_arena *arena= 0, backup;
/*
Each outer field is replaced for an Item_outer_ref object.
This is done in order to get correct results when the outer
select employs a temporary table.
The original fields are saved in the inner_fields_list of the
outer select. This list is created by the following reasons:
1. We can't add field items to the outer select list directly
because the outer select hasn't been fully fixed yet.
2. We need a location to refer to in the Item_ref object
so the inner_fields_list is used as such temporary
reference storage.
The new Item_outer_ref object replaces the original field and is
also saved in the inner_refs_list of the outer select. Here
it is only created. It can be fixed only after the original
field has been fixed and this is done in the fix_inner_refs()
function.
If an outer field is resolved in a grouping select then it
is replaced for an Item_outer_ref object. Otherwise an
Item_field object is used.
The new Item_outer_ref object is saved in the inner_refs_list of
the outer select. Here it is only created. It can be fixed only
after the original field has been fixed and this is done in the
fix_inner_refs() function.
*/
set_field(*from_field);
arena= thd->activate_stmt_arena_if_needed(&backup);
rf= new Item_outer_ref(context, this);
if (!rf)
{
if (arena)
thd->restore_active_arena(arena, &backup);
;
if (!(rf= new Item_outer_ref(context, this)))
return -1;
}
*reference= rf;
thd->change_item_tree(reference, rf);
select->inner_refs_list.push_back(rf);
if (arena)
thd->restore_active_arena(arena, &backup);
fixed_as_field= 1;
rf->in_sum_func= thd->lex->in_sum_func;
}
if (thd->lex->in_sum_func &&
thd->lex->in_sum_func->nest_level ==
@ -3642,11 +3625,20 @@ Item_field::fix_outer_field(THD *thd, Field **from_field, Item **reference)
rf= (place == IN_HAVING ?
new Item_ref(context, ref, (char*) table_name,
(char*) field_name, alias_name_used) :
(!select->group_list.elements ?
new Item_direct_ref(context, ref, (char*) table_name,
(char*) field_name, alias_name_used));
(char*) field_name, alias_name_used) :
new Item_outer_ref(context, ref, (char*) table_name,
(char*) field_name, alias_name_used)));
*ref= save;
if (!rf)
return -1;
if (place != IN_HAVING && select->group_list.elements)
{
outer_context->select_lex->inner_refs_list.push_back((Item_outer_ref*)rf);
((Item_outer_ref*)rf)->in_sum_func= thd->lex->in_sum_func;
}
thd->change_item_tree(reference, rf);
/*
rf is Item_ref => never substitute other items (in this case)
@ -5550,16 +5542,19 @@ bool Item_direct_view_ref::fix_fields(THD *thd, Item **reference)
bool Item_outer_ref::fix_fields(THD *thd, Item **reference)
{
DBUG_ASSERT(*ref);
/* outer_field->check_cols() will be made in Item_direct_ref::fix_fields */
outer_field->fixed_as_field= 1;
if (!outer_field->fixed &&
(outer_field->fix_fields(thd, reference)))
bool err;
/* outer_ref->check_cols() will be made in Item_direct_ref::fix_fields */
if ((*ref) && !(*ref)->fixed && ((*ref)->fix_fields(thd, reference)))
return TRUE;
table_name= outer_field->table_name;
return Item_direct_ref::fix_fields(thd, reference);
err= Item_direct_ref::fix_fields(thd, reference);
if (!outer_ref)
outer_ref= *ref;
if ((*ref)->type() == Item::FIELD_ITEM)
table_name= ((Item_field*)outer_ref)->table_name;
return err;
}
/*
Compare two view column references for equality.

44
sql/item.h
View file

@ -1220,7 +1220,6 @@ public:
uint have_privileges;
/* field need any privileges (for VIEW creation) */
bool any_privileges;
bool fixed_as_field;
Item_field(Name_resolution_context *context_arg,
const char *db_arg,const char *table_name_arg,
const char *field_name_arg);
@ -1978,30 +1977,49 @@ public:
};
/*
Class for outer fields.
An object of this class is created when the select where the outer field was
resolved is a grouping one. After it has been fixed the ref field will point
to either an Item_ref or an Item_direct_ref object which will be used to
access the field.
See also comments for the fix_inner_refs() and the
Item_field::fix_outer_field() functions.
*/
class Item_sum;
class Item_outer_ref :public Item_direct_ref
{
public:
Item_field *outer_field;
Item *outer_ref;
/* The aggregate function under which this outer ref is used, if any. */
Item_sum *in_sum_func;
/*
TRUE <=> that the outer_ref is already present in the select list
of the outer select.
*/
bool found_in_select_list;
Item_outer_ref(Name_resolution_context *context_arg,
Item_field *outer_field_arg)
:Item_direct_ref(context_arg, 0, outer_field_arg->table_name,
outer_field_arg->field_name),
outer_field(outer_field_arg)
outer_field_arg->field_name),
outer_ref(outer_field_arg), in_sum_func(0),
found_in_select_list(0)
{
ref= (Item**)&outer_field;
ref= &outer_ref;
set_properties();
fixed= 0;
}
void cleanup()
{
ref= (Item**)&outer_field;
fixed= 0;
Item_direct_ref::cleanup();
outer_field->cleanup();
}
Item_outer_ref(Name_resolution_context *context_arg, Item **item,
const char *table_name_arg, const char *field_name_arg,
bool alias_name_used_arg)
:Item_direct_ref(context_arg, item, table_name_arg, field_name_arg,
alias_name_used_arg),
outer_ref(0), in_sum_func(0), found_in_select_list(1)
{}
void save_in_result_field(bool no_conversions)
{
outer_field->save_org_in_field(result_field);
outer_ref->save_org_in_field(result_field);
}
bool fix_fields(THD *, Item **);
table_map used_tables() const

92
sql/sql_select.cc
View file

@ -278,15 +278,30 @@ bool handle_select(THD *thd, LEX *lex, select_result *result,
ref_pointer_array Array of references to Items used in current select
DESCRIPTION
The function fixes fields referenced from inner selects and
also fixes references (Item_ref objects) to these fields. Each field
is fixed as a usual hidden field of the current select - it is added
to the all_fields list and the pointer to it is saved in the
ref_pointer_array if latter is provided.
After the field has been fixed we proceed with fixing references
(Item_ref objects) to this field from inner subqueries. If the
ref_pointer_array is provided then Item_ref objects is set to
reference element in that array with the pointer to the field.
The function serves 3 purposes - adds fields referenced from inner
selects to the current select list, resolves which class to use
to access referenced item (Item_ref of Item_direct_ref) and fixes
references (Item_ref objects) to these fields.
If a field isn't already in the select list and the ref_pointer_array
is provided then it is added to the all_fields list and the pointer to
it is saved in the ref_pointer_array.
The class to access the outer field is determined by the following rules:
1. If the outer field isn't used under an aggregate function
then the Item_ref class should be used.
2. If the outer field is used under an aggregate function and this
function is aggregated in the select where the outer field was
resolved or in some more inner select then the Item_direct_ref
class should be used.
The resolution is done here and not at the fix_fields() stage as
it can be done only after sum functions are fixed and pulled up to
selects where they are have to be aggregated.
When the class is chosen it substitutes the original field in the
Item_outer_ref object.
After this we proceed with fixing references (Item_outer_ref objects) to
this field from inner subqueries.
RETURN
TRUE an error occured
@ -299,33 +314,64 @@ fix_inner_refs(THD *thd, List<Item> &all_fields, SELECT_LEX *select,
{
Item_outer_ref *ref;
bool res= FALSE;
bool direct_ref= FALSE;
List_iterator<Item_outer_ref> ref_it(select->inner_refs_list);
while ((ref= ref_it++))
{
Item_field *item= ref->outer_field;
Item *item= ref->outer_ref;
Item **item_ref= ref->ref;
Item_ref *new_ref;
/*
TODO: this field item already might be present in the select list.
In this case instead of adding new field item we could use an
existing one. The change will lead to less operations for copying fields,
smaller temporary tables and less data passed through filesort.
*/
if (ref_pointer_array)
if (ref_pointer_array && !ref->found_in_select_list)
{
int el= all_fields.elements;
ref_pointer_array[el]= (Item*)item;
ref_pointer_array[el]= item;
/* Add the field item to the select list of the current select. */
all_fields.push_front((Item*)item);
all_fields.push_front(item);
/*
If it's needed reset each Item_ref item that refers this field with
a new reference taken from ref_pointer_array.
*/
ref->ref= ref_pointer_array + el;
item_ref= ref_pointer_array + el;
}
if (!ref->fixed && ref->fix_fields(thd, 0))
if (ref->in_sum_func)
{
res= TRUE;
break;
Item_sum *sum_func;
if (ref->in_sum_func->nest_level > select->nest_level)
direct_ref= TRUE;
else
{
for (sum_func= ref->in_sum_func; sum_func &&
sum_func->aggr_level >= select->nest_level;
sum_func= sum_func->in_sum_func)
{
if (sum_func->aggr_level == select->nest_level)
{
direct_ref= TRUE;
break;
}
}
}
}
new_ref= direct_ref ?
new Item_direct_ref(ref->context, item_ref, ref->field_name,
ref->table_name, ref->alias_name_used) :
new Item_ref(ref->context, item_ref, ref->field_name,
ref->table_name, ref->alias_name_used);
if (!new_ref)
return TRUE;
ref->outer_ref= new_ref;
ref->ref= &ref->outer_ref;
if (!ref->fixed && ref->fix_fields(thd, 0))
return TRUE;
thd->used_tables|= item->used_tables();
}
return res;
@ -478,10 +524,6 @@ JOIN::prepare(Item ***rref_pointer_array,
if (having && having->with_sum_func)
having->split_sum_func2(thd, ref_pointer_array, all_fields,
&having, TRUE);
if (select_lex->inner_refs_list.elements &&
fix_inner_refs(thd, all_fields, select_lex, ref_pointer_array))
DBUG_RETURN(-1);
if (select_lex->inner_sum_func_list)
{
Item_sum *end=select_lex->inner_sum_func_list;
@ -494,6 +536,10 @@ JOIN::prepare(Item ***rref_pointer_array,
} while (item_sum != end);
}
if (select_lex->inner_refs_list.elements &&
fix_inner_refs(thd, all_fields, select_lex, ref_pointer_array))
DBUG_RETURN(-1);
if (setup_ftfuncs(select_lex)) /* should be after having->fix_fields */
DBUG_RETURN(-1);
@ -5214,7 +5260,9 @@ get_store_key(THD *thd, KEYUSE *keyuse, table_map used_tables,
}
else if (keyuse->val->type() == Item::FIELD_ITEM ||
(keyuse->val->type() == Item::REF_ITEM &&
((Item_ref*)keyuse->val)->ref_type() == Item_ref::OUTER_REF) )
((Item_ref*)keyuse->val)->ref_type() == Item_ref::OUTER_REF &&
(*(Item_ref**)((Item_ref*)keyuse->val)->ref)->ref_type() ==
Item_ref::DIRECT_REF) )
return new store_key_field(thd,
key_part->field,
key_buff + maybe_null,

1
sql/sql_union.cc
View file

@ -743,6 +743,7 @@ bool st_select_lex::cleanup()
error= (bool) ((uint) error | (uint) lex_unit->cleanup());
}
non_agg_fields.empty();
inner_refs_list.empty();
DBUG_RETURN(error);
}