From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
---|---|
To: | PetSerAl <petseral(at)gmail(dot)com> |
Cc: | "pgsql-bugs(at)lists(dot)postgresql(dot)org" <pgsql-bugs(at)lists(dot)postgresql(dot)org> |
Subject: | Re: Record returning function accept not matched columns declaration |
Date: | 2024-02-29 19:48:13 |
Message-ID: | CAKFQuwZ1-Ha1oHbHgveVgjNu6RWGQfVPNTO87y_=LxOmbyFBvA@mail.gmail.com |
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Lists: | pgsql-bugs |
On Thursday, February 29, 2024, PetSerAl <petseral(at)gmail(dot)com> wrote:
> postgres=# SHOW SERVER_VERSION;
> server_version
> ----------------
> 16.2
> (1 row)
>
>
> postgres=# with a(b) as (values (row(1,2,3)))
> postgres-# select * from a, coalesce(b) as c(d int,e int, f int)
> postgres-# union all
> postgres-# select * from a, nullif(b, null) as c(d int,e int, f int)
> postgres-# union all
> postgres-# select * from a, unnest(array[b]) as c(d int,e int, f int)
> postgres-# union all
> postgres-# select * from a, json_populate_record(b, null) as c(d int,e
> int, f int); --expect OK
> b | d | e | f
> ---------+---+---+---
> (1,2,3) | 1 | 2 | 3
> (1,2,3) | 1 | 2 | 3
> (1,2,3) | 1 | 2 | 3
> (1,2,3) | 1 | 2 | 3
> (4 rows)
My concern with all of this is accepting the specification of column
definitions for functions that don’t return the record pseudo-type. This
seems like it should be a syntax error, or better documented how it should
behave. Specifically, for this bug report to make sense, one must assume
that the specification of a column definition composite on a non-record
result must match the actual structure that is seen. The syntax is not a
means to implement a cast of a row-typed value. The fact the last two
examples implement a cast is a bug. One that apparently doesn’t manifest
for set-returning functions in the from clause but does manifest for
non-SRF laterally applied functions.
David J.
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