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From: Tom Lane <[email protected]>
To: Andres Freund <[email protected]>
Cc: [email protected]
Cc: David Rowley <[email protected]>
Subject: Re: Unfortunate pushing down of expressions below sort
Date: Thu, 05 Feb 2026 20:02:31 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <qddu2agmbiadpqkavqlamccrqxg6rm64sdq6q7ihpyndyfim6k@2dpox3fupa2g>
	<[email protected]>

I wrote:
> Yeah.  That's a hangover from an ancient decision that sort/limit
> would always be applied at the top of the plan tree.  I'm too
> lazy to check the details right now, but I think we already relaxed
> that in some cases (or maybe it was about evaluating stuff
> before/after GROUP BY?).

Ah, right: see make_sort_input_target() and its very extensive
comment in planner.c.  I wonder why that didn't trigger in
your example.

			regards, tom lane

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