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Prevent needless rexecuting empty subselects

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bell@sanja.is.com.ua 2002-06-06 16:28:22 +03:00
commit ab56d9b51b
3 changed files with 7 additions and 4 deletions
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5
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), optimized(0), error(0)
assigned(0), executed(0), optimized(0), error(0)
{
DBUG_ENTER("Item_subselect::Item_subselect");
DBUG_PRINT("subs", ("select_lex 0x%xl", (long) select_lex));
@ -141,7 +141,7 @@ int Item_subselect::exec()
return 1;
}
assign_null();
executed= 0;
executed= assigned= 0;
}
if (!executed)
{
@ -149,6 +149,7 @@ int Item_subselect::exec()
join->thd->lex.select= select_lex;
join->exec();
join->thd->lex.select= save_select;
executed= 1;
return join->error;
}
return 0;