On 06/02/15 21:39, Tom Lane wrote:
> I wrote:
>> I'm a bit disturbed by that, because AFAICS from the plans, these queries
>> did not involve any semi or anti joins, which should mean that the patch
>> would not have changed the planner's behavior.
>
> After contemplating my navel for awhile, it occurred to me that maybe the
> patch's changes in add_path_precheck could have caused behavioral changes
> at the margins. Could you try a run without that (without the last two
> hunks in pathnode.c)?
Yes, I think that's the cause. See the end of the message I sent just
before you posted this.
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
