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From: solaimurugan vellaipandiyan <[email protected]>
To: Petr Petrov <[email protected]>
Cc: Alena Rybakina <[email protected]>
Cc: Ilia Evdokimov <[email protected]>
Cc: David Rowley <[email protected]>
Cc: Ranier Vilela <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: pull-up subquery if JOIN-ON contains refs to upper-query
Date: Mon, 11 May 2026 10:50:20 +0530
Message-ID: <CAHEL7KTFh+W6HSEETpv_=P8weLKNrWPAu6y6GLwrKhnhENOTWg@mail.gmail.com> (raw)
In-Reply-To: <[email protected]>
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Hi Alena,

I did some additional testing on the latest patch and the behavior
looks good in my environment so far.

I verified the original EXISTS pull-up case and confirmed that after
applying the patch the planner generates optimized Semi Join plans
instead of EXISTS(SubPlan).
I also tested several additional cases discussed in the thread, including:
1.NOT EXISTS queries
2. constant qual conditions
3. ANY array conditions
4. LEFT JOIN cases
5. FULL JOIN cases
For the FULL JOIN scenarios, I checked both the execution plans and
actual query results. In one case the planner simplified the query
into a Hash Join plan, but the final query results remained correct.
I additionally ran:
 - make check
 - make -C contrib check
Both completed successfully in my environment and I did not observe
planner crashes or incorrect query results during testing.
Overall, the patch seems to improve planner behavior consistently for
these EXISTS pull-up scenarios.

Regards,
Solaimurugan V

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  Subject: Re: pull-up subquery if JOIN-ON contains refs to upper-query
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