Re: Proposal - improve eqsel estimates by including histogram bucket numdistinct statistics

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: "Zeugswetter Andreas OSB sIT" <Andreas(dot)Zeugswetter(at)s-itsolutions(dot)at>
Cc: "Nathan Boley" <npboley(at)gmail(dot)com>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "PostgreSQL-development" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Proposal - improve eqsel estimates by including histogram bucket numdistinct statistics
Date: 2008-06-10 10:13:55
Message-ID: 87prqpmwbg.fsf@oxford.xeocode.com
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

"Zeugswetter Andreas OSB sIT" <Andreas(dot)Zeugswetter(at)s-itsolutions(dot)at> writes:

> I think for low ndistinct values we will want to know the exact
> value + counts and not a bin. So I think we will want additional stats rows
> that represent "value 'a1' stats".

Isn't that what our most frequent values list does?

--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
Ask me about EnterpriseDB's Slony Replication support!

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Zeugswetter Andreas OSB sIT 2008-06-10 10:16:59 Re: Proposal - improve eqsel estimates by including histogram bucket numdistinct statistics
Previous Message Gregory Stark 2008-06-10 10:10:18 Re: Overhauling GUCS