| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Alexander Lakhin <exclusion(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL Developers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Teaching planner to short-circuit empty UNION/EXCEPT/INTERSECT inputs |
| Date: | 2025-11-04 10:00:09 |
| Message-ID: | CAApHDvpM7uggy7o1aj+iiMHdfFa17ufnWyZGK25aK6p1Kp0B7w@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Tue, 4 Nov 2025 at 22:54, David Rowley <dgrowleyml(at)gmail(dot)com> wrote:
> The reason we end up with the same result_rel is that we're not
> passing all the relids in fetch_upper_rel(root, UPPERREL_SETOP,
> relids) due to having removed dummy rels. I guess the fix might be
> something like record the relids even when skipping dummy relations.
> I'll go and explore that as an option.
This seems to fix it. I'll study it more in the morning (it's late in
my time zone).
David
| Attachment | Content-Type | Size |
|---|---|---|
| minimal_fix.patch | application/octet-stream | 909 bytes |
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