| From: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Imai Yoshikazu <yoshikazu_i443(at)live(dot)jp>, "jesper(dot)pedersen(at)redhat(dot)com" <jesper(dot)pedersen(at)redhat(dot)com>, "Imai, Yoshikazu" <imai(dot)yoshikazu(at)jp(dot)fujitsu(dot)com>, Amit Langote <amitlangote09(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: speeding up planning with partitions |
| Date: | 2019-04-01 10:02:44 |
| Message-ID: | 0b484202-4b89-0797-355f-5c23f786aa6a@lab.ntt.co.jp |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On 2019/03/30 0:29, Tom Lane wrote:
> Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> writes:
>> Finally, it's not in the patch, but how about visiting
>> get_relation_constraints() for revising this block of code:
>
> That seems like probably an independent patch --- do you want to write it?
Here is that patch.
It revises get_relation_constraints() such that the partition constraint
is loaded in only the intended cases. To summarize:
* PG 11 currently misses one such intended case (select * from partition)
causing a *bug* that constraint exclusion fails to exclude the partition
with constraint_exclusion = on
* HEAD loads the partition constraint even in some cases where 428b260f87
rendered doing that unnecessary
Thanks,
Amit
| Attachment | Content-Type | Size |
|---|---|---|
| HEAD-get_relation_constraints-fix.patch | text/plain | 3.6 KB |
| PG11-get_relation_constraints-fix.patch | text/plain | 3.6 KB |
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Andrey Lepikhov | 2019-04-01 10:18:18 | Re: Reduce amount of WAL generated by CREATE INDEX for gist, gin and sp-gist |
| Previous Message | Rafia Sabih | 2019-04-01 09:39:21 | Re: explain plans with information about (modified) gucs |