Re: Declaring a field that is also an out parameter in a function

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От Pavel Stehule
Тема Re: Declaring a field that is also an out parameter in a function
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Msg-id CAFj8pRBcwQ3CVGj7eDFezhG-dUtrsry3T9iHf0SmEnU=YXs-LQ@mail.gmail.com
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Ответ на Re: Declaring a field that is also an out parameter in a function  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Declaring a field that is also an out parameter in a function
Re: Declaring a field that is also an out parameter in a function
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ne 7. 7. 2024 v 0:14 odesílatel Tom Lane <tgl@sss.pgh.pa.us> napsal:
Michael Nolan <htfoot@gmail.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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