diff options
Diffstat (limited to 'sql/sql_union.cc')
| -rw-r--r-- | sql/sql_union.cc | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/sql/sql_union.cc b/sql/sql_union.cc index d230b903d2c..ca6870dab9c 100644 --- a/sql/sql_union.cc +++ b/sql/sql_union.cc @@ -1,4 +1,4 @@ -/* Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. +/* Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -282,6 +282,19 @@ bool st_select_lex_unit::prepare(THD *thd_arg, select_result *sel_result, Item *item_tmp; while ((item_tmp= it++)) { + /* + If the outer query has a GROUP BY clause, an outer reference to this + query block may have been wrapped in a Item_outer_ref, which has not + been fixed yet. An Item_type_holder must be created based on a fixed + Item, so use the inner Item instead. + */ + DBUG_ASSERT(item_tmp->fixed || + (item_tmp->type() == Item::REF_ITEM && + ((Item_ref *)(item_tmp))->ref_type() == + Item_ref::OUTER_REF)); + if (!item_tmp->fixed) + item_tmp= item_tmp->real_item(); + /* Error's in 'new' will be detected after loop */ types.push_back(new Item_type_holder(thd_arg, item_tmp)); } |