From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Michael Nolan <htfoot(at)gmail(dot)com>, "pgsql-general(at)postgresql(dot)org" <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Declaring a field that is also an out parameter in a function |
Date: | 2024-07-07 07:31:33 |
Message-ID: | CAFj8pRBcwQ3CVGj7eDFezhG-dUtrsry3T9iHf0SmEnU=YXs-LQ@mail.gmail.com |
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Lists: | pgsql-general |
ne 7. 7. 2024 v 0:14 odesílatel Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> napsal:
> Michael Nolan <htfoot(at)gmail(dot)com> writes:
> > Shouldn't declaring a field that is also an OUT parameter throw an error?
>
> No. The DECLARE is a block nested within the function,
> and the parameter is declared at function scope.
> So this is a standard case of an inner declaration masking
> an outer one.
>
> Possibly plpgsql_check can be set to complain about such cases,
> but they're legal according to the language specification.
>
yes, it does
(2024-07-07 09:27:14) postgres=# select * from
plpgsql_check_function('test_function');
┌───────────────────────────────────────────────────────────────┐
│ plpgsql_check_function │
╞═══════════════════════════════════════════════════════════════╡
│ warning:00000:10:statement block:parameter "d3" is overlapped │
│ Detail: Local variable overlap function parameter. │
│ warning extra:00000:8:DECLARE:never read variable "d3" │
│ warning extra:00000:unused parameter "$1" │
│ warning extra:00000:unused parameter "$2" │
│ warning extra:00000:unused parameter "$3" │
│ warning extra:00000:unmodified OUT variable "d3" │
└───────────────────────────────────────────────────────────────┘
(7 rows)
but looks so there are false alarms related to using an alias. It is
interesting so I have not any report about this issue, so probably using
aliases is not too common today.
Regards
Pavel
>
> regards, tom lane
>
>
>
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