Re: fix cost subqueryscan wrong parallel cost

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Richard Guo <guofenglinux(at)gmail(dot)com>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: fix cost subqueryscan wrong parallel cost
Date: 2022-04-29 14:54:16
Message-ID: 322474.1651244056@sss.pgh.pa.us
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I wrote:
> Really? Maybe I misunderstand the case under consideration, but
> what I think will be happening is that each worker will re-execute
> the pushed-down subquery in full.

Oh ... nevermind that: what I was thinking about was the SubLink/SubPlan
case, which is unrelated to SubqueryScan. -ENOCAFFEINE, sorry about that.

regards, tom lane

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