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From: Alena Rybakina <[email protected]>
To: solaimurugan vellaipandiyan <[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]>
Cc: Petr Petrov <[email protected]>
Subject: Re: pull-up subquery if JOIN-ON contains refs to upper-query
Date: Tue, 12 May 2026 20:19:27 +0300
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAHEL7KTFh+W6HSEETpv_=P8weLKNrWPAu6y6GLwrKhnhENOTWg@mail.gmail.com>
References: <[email protected]>
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	<CAHEL7KS2euWWoXYUL_NnaFc5j7QggobmfYFWDm-eTJFYONdRQA@mail.gmail.com>
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	<CAHEL7KTFh+W6HSEETpv_=P8weLKNrWPAu6y6GLwrKhnhENOTWg@mail.gmail.com>

Hi, thank you for your valuable feedback. If you have time you can test 
it on sqlsmith (https://github.com/anse1/sqlsmith) -
it will give some corner cases that should be observed.

On 11.05.2026 08:20, solaimurugan vellaipandiyan wrote:
> 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
>
>
-- 
-----------
Best regards,
Alena Rybakina

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