| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Laurenz Albe <laurenz(dot)albe(at)cybertec(dot)at>, postgres-hape(at)gmx(dot)de, pgsql-docs(at)lists(dot)postgresql(dot)org |
| Subject: | Re: group by can use alias from select list |
| Date: | 2023-09-07 00:01:30 |
| Message-ID: | 1591985.1694044890@sss.pgh.pa.us |
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| Lists: | pgsql-docs |
Bruce Momjian <bruce(at)momjian(dot)us> writes:
> On Tue, Jul 11, 2023 at 07:31:26AM -0700, David G. Johnston wrote:
>> I think the complaint is that someone seeing the behavior in the wild comes to
>> this order-of-operations and doesn't see that the observed behavior is
>> documented.
> How is the attached patch?
Maybe better "Although query output columns are nominally computed in the
next step, they can also be referenced (by name or by ordinal number)
as <literal>GROUP BY</literal> elements".
You could go further and add "Such references cannot be parts of
<literal>GROUP BY</literal> expressions, however." Not sure if we
cover that explicitly anywhere else.
regards, tom lane
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