On 15.04.15 15:26, vicentiu@mariadb.org wrote:

revision-id: eb47b226d268e7820a9153672798cf991a8fd0fa parent(s): cc84ac3be41d9d6ac480d55449d5bf4e324cca10 committer: Vicențiu Ciorbaru branch nick: server timestamp: 2015-04-15 16:23:43 +0300 message:

MDEV-7820 Server crashes in in my_strcasecmp_utf8 on subquery in ORDER BY clause of GROUP_CONCAT

It is possible for Item_field to have a NULL field_name. This is true if the Item_field is created based on a field in a temporary table that has no name. It is thus necessary to do a null check before attempting a strcmp.

Thank you. OK to push. (do not forget to run full test suite) [skip]