Re: Support "Right Semi Join" plan shapes

On Wed, 1 Nov 2023 at 11:25, Richard Guo <guofenglinux(at)gmail(dot)com> wrote:
>
>
> On Thu, Aug 10, 2023 at 3:24 PM Richard Guo <guofenglinux(at)gmail(dot)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