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From: Tom Lane <[email protected]>
To: Ray O'Donnell <[email protected]>
Cc: 'PostgreSQL' <[email protected]>
Subject: Re: Combining scalar and row types in RETURNING
Date: Tue, 03 Jun 2025 12:53:58 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <01020197369aac89-01a7b7b4-b775-471e-ac8e-de8b28d87008-000000@eu-west-1.amazonses.com>
References: <01020197369aac89-01a7b7b4-b775-471e-ac8e-de8b28d87008-000000@eu-west-1.amazonses.com>

"Ray O'Donnell" <[email protected]> writes:
> Can you combine scalar and row types in a RETURNING clause?

I think so.

> declare
>      m_action text;
>      m_new_data record;
> begin
>      merge into my_table t
>      using (
>          ....
>      ) s
>      on (t.id = s.id)
>      when matched then
>          update .....
>      when not matched then
>          insert .....
>      returning
>          merge_action(), t.*
>      into
>         m_action, m_new_data;

I think the problem here is that "t.*" gets expanded into a list of
all of t's columns, just as would happen in a SELECT's output list.
Try

	returning merge_action(), t

It might also be necessary to declare the target variable
"m_new_data" as being of type my_table rather than generic
"record"; not sure about that.

			regards, tom lane

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