|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|
|Views:||Raw Message | Whole Thread | Download mbox|
On Wed, Mar 9, 2016 at 9:21 AM, Tomas Vondra
> 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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