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From: Tom Lane <[email protected]>
Cc: David Rowley <[email protected]>
Cc: Richard Guo <[email protected]>
Cc: nikhil raj <[email protected]>
Cc: [email protected]
Subject: Re: Significant Execution Time Difference Between PG13.14 and PG16.4 for Query on information_schema Tables.
Date: Tue, 27 Aug 2024 19:37:56 -0400
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <CALNXOfqDr5jVRZHThyXyNftDuezjxOJB1mqw=4x1T8YBibi6uw@mail.gmail.com>
	<CAG1ps1w61XD1LxUf3EBCZ=VR3S_orRj_dk6cxmO5KusBVyrgMg@mail.gmail.com>
	<CAAvG1pChk3W9MWkK-_JPyUdThSoJhv4MueH5i8cZS2T_HUP5dA@mail.gmail.com>
	<CAG1ps1xvnTZceKK24OUfMKLPvDP2vjT-d+F2AOCWbw_v3KeEgg@mail.gmail.com>
	<[email protected]>
	<CAApHDvpRxyw1G2HVkA=PM5Uqh59moOFqPXyMTsEDUadKo2fQTA@mail.gmail.com>
	<[email protected]>
	<CAApHDvoQRoKHNfTaw+Sn=bZGKVmn8W-5yBPGP7+98mWJz5A9uQ@mail.gmail.com>
	<[email protected]>
	<[email protected]>
	<CAApHDvp1mue1a5fdfsa2z2mAS6v2d9+kxMzxH7GhAiC0Z7o8Mw@mail.gmail.com>
	<[email protected]>

I wrote:
> That seems like a pretty fishy way to do it.  Are you saying that
> Memoize is never applicable if there aren't outer joins in the
> query?  Without OJs there probably won't be any PHVs.

Oh, scratch that, I see you mean this is an additional way to do it
not the only way to do it.  But I'm confused why it works for
	t1.two+1 AS c1
but not
	t1.two+t2.two AS c1
Those ought to look pretty much the same for this purpose.

			regards, tom lane






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  Cc: [email protected], [email protected], [email protected], [email protected], [email protected]
  Subject: Re: Significant Execution Time Difference Between PG13.14 and PG16.4 for Query on information_schema Tables.
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