Re: WIP: multivariate statistics / proof of concept

From: Albe Laurenz <laurenz(dot)albe(at)wien(dot)gv(dot)at>
To: "Tomas Vondra *EXTERN*" <tv(at)fuzzy(dot)cz>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WIP: multivariate statistics / proof of concept
Date: 2014-10-13 07:36:19
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Tomas Vondra wrote:
> attached is a WIP patch implementing multivariate statistics.

I think that is pretty useful.
Oracle has an identical feature called "extended statistics".

That's probably an entirely different thing, but it would be very
nice to have statistics to estimate the correlation between columns
of different tables, to improve the estimate for the number of rows
in a join.

Laurenz Albe

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