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fixed way of forward reference detection to support literal constant (BUG#8025)

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mysql-test/r/subselect.result:
  Forward reference detection
mysql-test/t/subselect.test:
  Forward reference detection
sql/item.cc:
  now forward reference is detected via ref_pointer_array, because some literal constants are 'fixed' just after creation
sql/sql_base.cc:
  fill ref_pointer_array with zerows for forward reference detection.
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unknown
2005-01-24 17:17:19 +02:00
parent 9182786918
commit 38e664cf64
4 changed files with 48 additions and 2 deletions
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14
sql/sql_base.cc
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@ -2405,6 +2405,20 @@ int setup_fields(THD *thd, Item **ref_pointer_array, TABLE_LIST *tables,
thd->allow_sum_func= allow_sum_func;
thd->where="field list";
/*
To prevent fail on forward lookup we fill it with zerows,
then if we got pointer on zero after find_item_in_list we will know
that it is forward lookup.
There is other way to solve problem: fill array with pointers to list,
but it will be slower.
TODO: remove it when (if) we made one list for allfields and
ref_pointer_array
*/
if (ref_pointer_array)
bzero(ref_pointer_array, sizeof(Item *) * fields.elements);
Item **ref= ref_pointer_array;
while ((item= it++))
{