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From: Tom Lane <[email protected]>
To: Michel Pelletier <[email protected]>
Cc: [email protected]
Subject: Re: Using Expanded Objects other than Arrays from plpgsql
Date: Fri, 01 Nov 2024 18:20:09 -0400
Message-ID: <[email protected]> (raw)
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Michel Pelletier <[email protected]> writes:
> Here's two backtraces from gdb from this function:
> CREATE OR REPLACE FUNCTION test2(graph matrix)
>     RETURNS bigint LANGUAGE plpgsql AS
>     $$
>     BEGIN
>     perform set_element(graph, 1, 1, 1);
>     RETURN nvals(graph);
>     end;
>     $$;

Well, you shouldn't be using PERFORM.  Not only does it not do the
right thing, but it's not optimized for expanded objects at all:
they'll get flattened both on the way into the statement and on
the way out.  Try it with

     graph := set_element(graph, 1, 1, 1);
     RETURN nvals(graph);

			regards, tom lane






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