| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Lack of T_TargetEntry in exprType function |
| Date: | 2018-03-20 14:43:08 |
| Message-ID: | 12279.1521556988@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Konstantin Knizhnik <k(dot)knizhnik(at)postgrespro(dot)ru> writes:
> On 20.03.2018 17:00, Tom Lane wrote:
>> It's intentional because that's not considered an executable
>> expression.
> I tried to apply this function to the argument of Aggref and it has
> exactly this kind.
> Aggref is executable expression. This is why I thought that all its
> arguments also should be considered as executable expressions, shouldn't
> they?
Not really. They're a list of executable expressions, which is not the
same thing --- in particular, exprType() on the whole list wouldn't give a
useful result. The TargetEntrys are best thought of as part of the list
superstructure.
regards, tom lane
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