| From: | Ashutosh Bapat <ashutosh(dot)bapat(dot)oss(at)gmail(dot)com> |
|---|---|
| To: | Andy Fan <zhihui(dot)fan1213(at)gmail(dot)com> |
| Cc: | Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, David Rowley <dgrowleyml(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Floris Van Nee <florisvannee(at)optiver(dot)com>, "Hou, Zhijie" <houzj(dot)fnst(at)cn(dot)fujitsu(dot)com>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Masahiko Sawada <sawada(dot)mshk(at)gmail(dot)com>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com> |
| Subject: | Re: UniqueKey on Partitioned table. |
| Date: | 2021-03-29 13:26:59 |
| Message-ID: | CAExHW5vCDRbuDXQe+8KUxVGv819gkmsfrX_t1PytcRbCAdzp0Q@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On Sat, Mar 27, 2021 at 11:44 AM Andy Fan <zhihui(dot)fan1213(at)gmail(dot)com> wrote:
>
>
>
> On Sat, Mar 27, 2021 at 3:07 AM Dmitry Dolgov <9erthalion6(at)gmail(dot)com> wrote:
>>
>> > On Sat, Feb 20, 2021 at 10:25:59AM +0800, Andy Fan wrote:
>> >
>> > The attached is a UnqiueKey with EquivalenceClass patch, I just complete the
>> > single relation part and may have bugs. I just attached it here for design
>> > review only. and the not-null-attrs is just v1 which we can continue
>> > discussing on the original thread[2].
>>
>> Thanks for the patch. After a short look through it I'm a bit confused
>> and wanted to clarify, now uniquekeys list could contain both Expr and
>> EquivalenceClass?
>
>
> Yes, That's because I don't want to create a new EquivalenceClass (which
> would make the PlannerInfo->eq_classes longer) if we don't have
> one , then I just used one Expr instead for this case.
> However during the
> test, I found some EquivalenceClass with only 1 EquivalenceMember
> unexpectedly.
>
Pathkeys may induce single member ECs. Why UniqueKeys are an exception?
--
Best Wishes,
Ashutosh Bapat
| From | Date | Subject | |
|---|---|---|---|
| Next Message | David Steele | 2021-03-29 13:36:30 | Re: parallel distinct union and aggregate support patch |
| Previous Message | Alvaro Herrera | 2021-03-29 13:25:36 | Re: Rename of triggers for partitioned tables |