Re: Why percent_rank is so slower than rank?

From: "Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Why percent_rank is so slower than rank?
Date: 2010-12-09 23:08:46
Message-ID: 4D010D1E0200002500038585@gw.wicourts.gov
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Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:

> Do you have reason to think that anybody is likely to exercise
> window functions in HEAD, beyond what the regression tests do, in
> the next couple of months?

Not specifically, no. From the description (not having read the
patch) I was somewhat concerned that it might affect something
outside that narrow use case. If that's not possible, then I'm more
comfortable putting it in a release that soon after it hits the
repository.

It's a judgment call, and you're clearly in the best position to
make it. You asked for thoughts, so I shared my concerns. :-)

-Kevin

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