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added depended subselect processing

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This commit is contained in:
bell@sanja.is.com.ua 2002-05-26 22:50:32 +03:00
commit 35faf872aa
9 changed files with 109 additions and 17 deletions
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28
sql/item_subselect.cc
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@ -36,7 +36,7 @@ SUBSELECT TODO:
#include "sql_select.h"
Item_subselect::Item_subselect(THD *thd, st_select_lex *select_lex):
executed(0)
executed(0), optimized(0), error(0)
{
DBUG_ENTER("Item_subselect::Item_subselect");
DBUG_PRINT("subs", ("select_lex 0x%xl", (long) select_lex));
@ -48,7 +48,7 @@ Item_subselect::Item_subselect(THD *thd, st_select_lex *select_lex):
item value is NULL if select_subselect not changed this value
(i.e. some rows will be found returned)
*/
assign_null();
assign_null();
DBUG_VOID_RETURN;
}
@ -110,17 +110,31 @@ bool Item_subselect::fix_fields(THD *thd,TABLE_LIST *tables)
(ORDER*) 0, select_lex,
(SELECT_LEX_UNIT*) select_lex->master))
return 1;
if (join->optimize())
{
executed= 1;
return 1;
}
thd->lex.select= save_select;
return 0;
}
int Item_subselect::exec()
{
if (!optimized)
{
optimized=1;
if (join->optimize())
{
executed= 1;
return (join->error?join->error:1);
}
}
if (join->select_lex->depended && executed)
{
if (join->reinit())
{
error= 1;
return 1;
}
assign_null();
executed= 0;
}
if (!executed)
{
SELECT_LEX *save_select= join->thd->lex.select;