| From: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
|---|---|
| To: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Ashutosh Bapat <ashutosh(dot)bapat(at)enterprisedb(dot)com>, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: why partition pruning doesn't work? |
| Date: | 2018-06-07 03:21:18 |
| Message-ID: | CAKJS1f8pcr5+LbK8hDyazE0ogP-f-KtwAjf-Psd-b5uCOhF9ug@mail.gmail.com |
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| Lists: | pgsql-hackers |
On 7 June 2018 at 14:51, Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> wrote:
> Thanks David. This one looks good. I also like it that hasparamlessexprs
> is no longer determined and set in the planner.
Thanks for checking it.
> I checked what happens with the cases that Ashutosh complained about
> upthread and seems that the pruning works as expected.
[...]
> explain (costs off, analyze) select * from t1 x left join t1 y on x.a =
> y.b + 100 where y.a = 5;
Yeah, I added a test to partition_prune.sql that verifies a similar case.
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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