| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | David Rowley <dgrowleyml(at)gmail(dot)com> |
| Cc: | Daniel Farkaš <daniel(dot)farkas(at)datoris(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, PostgreSQL mailing lists <pgsql-bugs(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: BUG #17502: View based on window functions returns wrong results when queried |
| Date: | 2022-05-30 02:18:59 |
| Message-ID: | 3722616.1653877139@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
David Rowley <dgrowleyml(at)gmail(dot)com> writes:
> The problem seems to be down to the fact that
> remove_unused_subquery_outputs() does not check if the to-be-removed
> target entry references WindowClauses which contain set-returning
> functions.
I was sort of wondering why we allow SRFs in this context in the
first place. The results don't seem terribly well-defined to me.
In particular, a WindowFunc invocation is not supposed to change the
number of rows in the query result, and yet this one is doing so.
regards, tom lane
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