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Fixed bug #25027.

Browse source 
Blocked evaluation of constant objects of the classes
Item_func_is_null and Item_is_not_null_test at the
prepare phase in the cases when the objects used subqueries. 


mysql-test/r/ps.result:
  Extended test case for bug #25027.
mysql-test/t/ps.test:
  Extended test case for bug #25027.
sql/sql_lex.cc:
  Returned back the assertion in st_select_lex_unit::set_limit,
  removed by the previous commit for this bug.
This commit is contained in:
unknown 2006-12-13 21:08:25 -08:00
commit cbd1bd9078
5 changed files with 18 additions and 4 deletions
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6
sql/item_cmpfunc.cc
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@ -2990,7 +2990,7 @@ longlong Item_func_isnull::val_int()
Handle optimization if the argument can't be null
This has to be here because of the test in update_used_tables().
*/
if (!used_tables_cache)
if (!used_tables_cache && !with_subselect)
return cached_value;
return args[0]->is_null() ? 1: 0;
}
@ -2999,7 +2999,7 @@ longlong Item_is_not_null_test::val_int()
{
DBUG_ASSERT(fixed == 1);
DBUG_ENTER("Item_is_not_null_test::val_int");
if (!used_tables_cache)
if (!used_tables_cache && !with_subselect)
{
owner->was_null|= (!cached_value);
DBUG_PRINT("info", ("cached :%ld", (long) cached_value));
@ -3026,7 +3026,7 @@ void Item_is_not_null_test::update_used_tables()
else
{
args[0]->update_used_tables();
if (!(used_tables_cache=args[0]->used_tables()))
if (!(used_tables_cache=args[0]->used_tables()) && !with_subselect)
{
/* Remember if the value is always NULL or never NULL */
cached_value= (longlong) !args[0]->is_null();