Re: multivariate statistics v14

From: Jeff Janes <jeff(dot)janes(at)gmail(dot)com>
To: Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>
Cc: Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: multivariate statistics v14
Date: 2016-03-09 18:09:35
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On Wed, Mar 9, 2016 at 9:21 AM, Tomas Vondra
<tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
> Hi,
> On Wed, 2016-03-09 at 08:45 -0800, Jeff Janes wrote:
>> On Wed, Mar 9, 2016 at 7:02 AM, Tomas Vondra
>> <tomas(dot)vondra(at)2ndquadrant(dot)com> wrote:
>> > Hi,
>> >
>> > thanks for the feedback. Attached is v14 of the patch series, fixing
>> > most of the points you've raised.
>> Hi Tomas,
>> Applied to aa09cd242fa7e3a694a31f, I still get the seg faults in make
>> check if I configure without --enable-cassert.
> Ah, after disabling asserts I can reproduce it too. And the reason why
> it fails is quite simple - clauselist_selectivity modifies the original
> list of clauses, which then confuses cost_qual_eval.
> Can you try if the attached patch fixes the issue? I'll need to rework a
> bit more of the code, but let's see if this fixes the issue on your
> machine too.

Yes, that fixes it.

>> With --enable-cassert, it passes the regression test.
> I wonder how can it work with casserts and fail without them. That's
> kinda exactly the opposite to what I'd expect ...

I too was surprised by that. Maybe cassert makes a copy of some data
structure which is used in-place without cassert?



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