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don't cast random items to Item_result_field*

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do it only for items that inherit from Item_result_field*
This commit is contained in:
Sergei Golubchik 2017-06-21 16:07:29 +02:00
commit e91fd8783a
1 changed files with 9 additions and 9 deletions
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18
sql/sql_select.cc
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@ -16281,27 +16281,27 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
/* Fall through */
case Item::COND_ITEM:
case Item::SUBSELECT_ITEM:
case Item::REF_ITEM:
case Item::EXPR_CACHE_ITEM:
if (make_copy_field)
{
DBUG_ASSERT(((Item_result_field*)item)->result_field);
*from_field= ((Item_result_field*)item)->result_field;
}
/* Fall through */
case Item::FIELD_AVG_ITEM:
case Item::FIELD_STD_ITEM:
case Item::SUBSELECT_ITEM:
/* The following can only happen with 'CREATE TABLE ... SELECT' */
case Item::PROC_ITEM:
case Item::INT_ITEM:
case Item::REAL_ITEM:
case Item::DECIMAL_ITEM:
case Item::STRING_ITEM:
case Item::DATE_ITEM:
case Item::REF_ITEM:
case Item::NULL_ITEM:
case Item::VARBIN_ITEM:
case Item::CACHE_ITEM:
case Item::EXPR_CACHE_ITEM:
case Item::PARAM_ITEM:
if (make_copy_field)
{
DBUG_ASSERT(((Item_result_field*)item)->result_field);
*from_field= ((Item_result_field*)item)->result_field;
}
return create_tmp_field_from_item(thd, item, table,
(make_copy_field ? 0 : copy_func),
modify_item);