diff options
Diffstat (limited to 'sql/item_sum.cc')
| -rw-r--r-- | sql/item_sum.cc | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/sql/item_sum.cc b/sql/item_sum.cc index 08385bb9ca6..835278ae262 100644 --- a/sql/item_sum.cc +++ b/sql/item_sum.cc @@ -46,7 +46,11 @@ Item_sum::Item_sum(List<Item> &list) void Item_sum::make_field(Send_field *tmp_field) { if (args[0]->type() == Item::FIELD_ITEM && keep_field_type()) + { ((Item_field*) args[0])->field->make_field(tmp_field); + if (maybe_null) + tmp_field->flags&= ~NOT_NULL_FLAG; + } else { tmp_field->flags=0; @@ -158,7 +162,8 @@ Item_sum_hybrid::fix_fields(THD *thd,TABLE_LIST *tables) else max_length=item->max_length; decimals=item->decimals; - maybe_null=item->maybe_null; + /* MIN/MAX can return NULL for empty set indepedent of the used column */ + maybe_null= 1; binary=item->binary; unsigned_flag=item->unsigned_flag; result_field=0; |