Re: Receiving many more rows than expected

Vincent de Phily wrote
> On Friday 09 May 2014 06:52:33 Adrian Klaver wrote:
>> On 05/09/2014 05:36 AM, Vincent de Phily wrote:
>> > On Friday 09 May 2014 07:01:32 Tom Lane wrote:
>> >> Vincent de Phily <

> vincent.dephily@

> > writes:
>> >>> In case it changes anything, this is the uncut (but still anonimized)
>> >>>
>> >>> function:
>> >>>      query = """UPDATE foo SET processing = 't' WHERE id IN
>> >>>
>> >>>             (SELECT id FROM foo WHERE processing = 'f' ORDER BY id
>> ASC
>> >>>             LIMIT %d
>> >>>
>> >>>              FOR UPDATE)
>> >>>
>> >>>             RETURNING *""" % (conf_getint('DEFAULT', 'push_count',
>> >>>             5000),)
>> >>
>
> Thanks to all for taking an interest so far, this bug is... weird.

This seems to likely be the same, still open, bug reported previously:

No Number Assigned:
http://www.postgresql.org/message-id/CANCipfpfzoYnOz5jj=UZ70_R=CwDHv36dqWSpwsi27vpm1z5sA@mail.gmail.com

#8464
http://www.postgresql.org/message-id/E1VN53g-0002Iy-Il@wrigleys.postgresql.org

#8470 is referenced in the first thread as well...though that is
specifically a performance issue and not a query bug.

The recommended work-around is to move the sub-query using the "FOR UPDATE"
into a CTE.

David J.




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