Re: Retrieve results in PostgreSQL stored procedure allowing query parallelism

From: "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>
To: Joan Pujol <joanpujol(at)gmail(dot)com>
Cc: pgsql-general(at)lists(dot)postgresql(dot)org
Subject: Re: Retrieve results in PostgreSQL stored procedure allowing query parallelism
Date: 2023-11-21 18:21:58
Message-ID: CAKFQuwaXoR=Rzh+dGRWBxUxuAtriqsfDGdSC=z+OyShAHPzfUQ@mail.gmail.com
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On Tue, Nov 21, 2023, 11:10 Joan Pujol <joanpujol(at)gmail(dot)com> wrote:

> I want to execute an SQL query and process its results inside a stored
> procedure without preventing query parallelism. Since I don't want to
> prevent query parallelism, cursors can't be used, and I would like to
> avoid creating a temporal table.
>
> Is this possible? If so, what is the best way to execute the query,
> retrieve all results in memory, and process them inside the stored
> procedure?
>

You must use create table as if you want a result that is both accessible
to subsequent statements and uses parallelism to be produced. There is no
saving results into memory - you either save them explicitly or iterate
over them and the later prevents parallelism as you've noted.

David J.

>

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