Horton

Re: Group-count estimation statistics

Manfred Koizar <mkoi-pg@aon.at>

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From: Manfred Koizar <mkoi-pg@aon.at>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-hackers@postgreSQL.org
Date: 2005-01-31T11:08:41Z
Lists: pgsql-hackers 
On Fri, 28 Jan 2005 10:53:33 -0500, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> we should consider
>something like "clamp to size of table / 10" instead.

... unless a *single* grouping column is estimated to have more than
N/10 distinct values, which should be easy to check.

Servus
 Manfred