Re: Support "Right Semi Join" plan shapes

vignesh C <vignesh21@gmail.com>

From: vignesh C <vignesh21@gmail.com>

To: Richard Guo <guofenglinux@gmail.com>

Cc: PostgreSQL-development <pgsql-hackers@postgresql.org>

Date: 2024-01-07T07:03:00Z

Lists: pgsql-hackers

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Support "Right Semi Join" plan shapes
- aa86129e19d7 18.0 landed
Fix neqjoinsel's behavior for semi/anti join cases.
- 7ca25b7de6ae 11.0 cited

On Wed, 1 Nov 2023 at 11:25, Richard Guo <guofenglinux@gmail.com> wrote:
>
>
> On Thu, Aug 10, 2023 at 3:24 PM Richard Guo <guofenglinux@gmail.com> wrote:
>>
>> The cfbot reminds that this patch does not apply any more, so rebase it
>> to v2.
>
>
> Attached is another rebase over the latest master.  Any feedback is
> appreciated.

One of the tests in CFBot has failed at [1] with:
-   Relations: (public.ft1 t1) SEMI JOIN (public.ft2 t2)
-   Remote SQL: SELECT r1."C 1", r1.c2, r1.c3, r1.c4, r1.c5, r1.c6,
r1.c7, r1.c8 FROM "S 1"."T 1" r1 WHERE ((r1."C 1" < 20)) AND EXISTS
(SELECT NULL FROM "S 1"."T 1" r3 WHERE ((r3."C 1" > 10)) AND
((date(r3.c5) = '1970-01-17'::date)) AND ((r3.c3 = r1.c3))) ORDER BY
r1."C 1" ASC NULLS LAST
-(4 rows)
+   Sort Key: t1.c1
+   ->  Foreign Scan
+         Output: t1.c1, t1.c2, t1.c3, t1.c4, t1.c5, t1.c6, t1.c7, t1.c8
+         Relations: (public.ft1 t1) SEMI JOIN (public.ft2 t2)
+         Remote SQL: SELECT r1."C 1", r1.c2, r1.c3, r1.c4, r1.c5,
r1.c6, r1.c7, r1.c8 FROM "S 1"."T 1" r1 WHERE ((r1."C 1" < 20)) AND
EXISTS (SELECT NULL FROM "S 1"."T 1" r3 WHERE ((r3."C 1" > 10)) AND
((date(r3.c5) = '1970-01-17'::date)) AND ((r3.c3 = r1.c3)))
+(7 rows)

More details are available at [2].

[1] - https://cirrus-ci.com/task/4868751326183424
[2] - https://api.cirrus-ci.com/v1/artifact/task/4868751326183424/testrun/build/testrun/postgres_fdw/regress/regression.diffs

Regards,
Vignesh