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From: Jean-Christophe BOGGIO <[email protected]>
To: [email protected]
Subject: Re: Any way to get nested loop index joins on CTEs?
Date: Wed, 16 Jul 2025 13:24:54 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAFvQSYQAJWioHyUNUOjhj0_P0Z9_f_G_5B=9XyYZyPUpzsWW=A@mail.gmail.com>
References: <CAFvQSYQAJWioHyUNUOjhj0_P0Z9_f_G_5B=9XyYZyPUpzsWW=A@mail.gmail.com>

Following up on this, I very often have to create PLPgSql functions to 
workaround this problem: create one (or several) temp table(s) (with ON 
COMMIT DROP), analyze it/them and create indices on some field(s).

Being able to write something like:

WITH xxx AS MATERIALIZED ANALYZED INDEXED ON field1 (
     SELECT DISTINCT myfield AS field1
     FROM table1
)
SELECT field2
FROM table2
JOIN xxx USING(field1);

would help a lot in some cases. Of course, the syntax is just a thought 
but the general idea is there.

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