Re: Plan time Improvement - 64bit bitmapset

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Greg Stark <greg(dot)stark(at)enterprisedb(dot)com>
Cc: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, Gregory Stark <stark(at)enterprisedb(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Plan time Improvement - 64bit bitmapset
Date: 2009-06-03 21:59:03
Message-ID: 26045.1244066343@sss.pgh.pa.us
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Greg Stark <greg(dot)stark(at)enterprisedb(dot)com> writes:
> It does seem like it ought to be possible to truncate strings in the
> histogram since any string between the actual values us equally good.

Yeah, that was the justification for dropping the wide values ---
that and the theory that they'd be unlikely to be most-common values.

regards, tom lane

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