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From: Tom Lane <[email protected]>
To: Richard Guo <[email protected]>
Cc: Pg Hackers <[email protected]>
Cc: Finnerty, Jim <[email protected]>
Subject: Re: Making Vars outer-join aware
Date: Tue, 12 Jul 2022 09:37:41 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAMbWs4-0cdVpgY0c2uULBCX2vPjQt3Fx3=XFZh-Mn=UWmxhG-A@mail.gmail.com>
References: <[email protected]>
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Richard Guo <[email protected]> writes:
> Note that the evaluation of expression 'b.j + 1' now occurs below the
> outer join. Is this something we need to be concerned about?

It seems more formally correct to me, but perhaps somebody would
complain about possibly-useless expression evals.  We could likely
re-complicate the logic that inserts PHVs during pullup so that it
looks for Vars it can apply the nullingrels to.  Maybe there's an
opportunity to share code with flatten_join_alias_vars?

			regards, tom lane

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