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help / color / mirror / Atom feedFrom: Tom Lane <[email protected]>
To: David Rowley <[email protected]>
Cc: Daniel Farkaš <[email protected]>
Cc: Magnus Hagander <[email protected]>
Cc: PostgreSQL mailing lists <[email protected]>
Subject: Re: BUG #17502: View based on window functions returns wrong results when queried
Date: Sun, 29 May 2022 22:18:59 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAApHDvoR4BXm7oxSrYhpEAFOZ-qMPkkYnn14y6sxtPf=5w5OOw@mail.gmail.com>
References: <[email protected]>
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David Rowley <[email protected]> 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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