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From: Ron Johnson <[email protected]>
To: David G. Johnston <[email protected]>
Cc: pgsql-generallists.postgresql.org <[email protected]>
Subject: Re: Seeking Clarification on Function Definitions in PostgreSQL Extensions
Date: Tue, 18 Jun 2024 15:04:17 -0400
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On Tue, Jun 18, 2024 at 2:37 PM David G. Johnston <
[email protected]> wrote:

> On Tuesday, June 18, 2024, Ron Johnson <[email protected]> wrote:
>
>> On Tue, Jun 18, 2024 at 1:57 PM David G. Johnston <
>> [email protected]> wrote:
>>
>>> On Tuesday, June 18, 2024, Ron Johnson <[email protected]> wrote:
>>>
>>>>
>>>> But I stand by returning OUT params and records at the same time.
>>>>
>>>
>>> You mean you dislike adding the optional returns clause when output
>>> parameters exist?
>>>
>>
>> Correct.  It breaks the distinction between function and procedure.
>>
>
> How so?
>
> The two distinctions are functions can produce sets while procedures get
> transaction control.
>
> They both can produce a single multi-column output record.  The presence
> or absence of the optional return clause on a function definition doesn’t
> change that fact.
>

"A function returns a value*, but a procedure does not."

*In the case of SQL, "value" might be a set.

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