> revision-id: alexey.kopytov@sun.com-20100824103548-ikm79qlfrvggyj9h
> parent: sunny.bains@oracle.com-20100816001222-xqc447tr6jwh8c53
> committer: Alexey Kopytov <Alexey.Kopytov@Sun.com>
> branch nick: 5.1-security
> timestamp: Tue 2010-08-24 14:35:48 +0400
> message:
>   Bug #55568: user variable assignments crash server when used
>               within query
>   
>   The server could crash after materializing a derived table
>   which requires a temporary table for grouping.
>   
>   When destroying the temporary table used to execute a query for
>   a derived table, JOIN::destroy() did not clean up Item_fields
>   pointing to fields in the temporary table. This led to
>   dereferencing a dangling pointer when printing out the items
>   tree later in the outer SELECT.
>   
>   The solution is an addendum to the patch for bug37362: in
>   addition to cleaning up items in tmp_all_fields3, do the same
>   for items in tmp_all_fields1, since now we have an example
>   where this is necessary.