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Re: [Commits] eb47b22: MDEV-7820 Server crashes in in my_strcasecmp_utf8 on subquery in ORDER BY clause of GROUP_CONCAT

To: maria-developers@xxxxxxxxxxxxxxxxxxx, commits@xxxxxxxxxxx, Vicențiu Ciorbaru <vicentiu@xxxxxxxxxxx>
From: Oleksandr Byelkin <sanja@xxxxxxxxxxxxxxxx>
Date: Wed, 15 Apr 2015 16:56:07 +0200
In-reply-to: <552e66fa.ca9dc20a.70ec.3685@mx.google.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.6.0

On 15.04.15 15:26, vicentiu@xxxxxxxxxxx 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)

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