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a simpler fix for

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MySQL Bug #12408412: GROUP_CONCAT + ORDER BY + INPUT/OUTPUT SAME USER VARIABLE = CRASH
and
MySQL Bug#14664077 SEVERE PERFORMANCE DEGRADATION IN SOME CASES WHEN USER VARIABLES ARE USED


sql/item_func.cc:
  don't use anything from Item_func_set_user_var::fix_fields()
  in Item_func_set_user_var::save_item_result()
sql/sql_class.cc:
  Call suv->save_item_result(item) *before* doing suv->fix_fields(), because
  the former evaluates the item (and caches its value), while the latter marks
  the user variable as non-const. The problem is that the item was fix_field'ed
  when the user variable was const, and it doesn't expect it to change to non-const
  in the middle of the execution.
This commit is contained in:
Sergei Golubchik
2013-02-28 11:46:35 +01:00
parent 6a2d730a7f
commit 027e34e13b
4 changed files with 12 additions and 2 deletions
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2
sql/sql_class.cc
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@@ -2922,9 +2922,9 @@ int select_dumpvar::send_data(List<Item> &items)
else
{
Item_func_set_user_var *suv= new Item_func_set_user_var(mv->s, item);
suv->save_item_result(item);
if (suv->fix_fields(thd, 0))
DBUG_RETURN (1);
suv->save_item_result(item);
if (suv->update())
DBUG_RETURN (1);
}