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From: Tom Lane <[email protected]>
To: David G. Johnston <[email protected]>
Cc: Vik Fearing <[email protected]>
Cc: PostgreSQL Hackers <[email protected]>
Subject: Re: ANY_VALUE aggregate
Date: Mon, 05 Dec 2022 13:04:39 -0500
Message-ID: <[email protected]> (raw)
In-Reply-To: <CAKFQuwau9pyMB=4S-RUEZ6_Nf_=BuSVb+7FKhjJqPyaSROjreQ@mail.gmail.com>
References: <[email protected]>
	<CAKFQuwau9pyMB=4S-RUEZ6_Nf_=BuSVb+7FKhjJqPyaSROjreQ@mail.gmail.com>

"David G. Johnston" <[email protected]> writes:
> Can we please add "first_value" and "last_value" if we are going to add
> "some_random_value" to our library of aggregates?

First and last according to what ordering?  We have those in the
window-aggregate case, and I don't think we want to encourage people
to believe that "first" and "last" are meaningful otherwise.

ANY_VALUE at least makes it clear that you're getting an unspecified
one of the inputs.

			regards, tom lane

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