attribute distinct values estimate

From: Roberto Cornacchia <rcorna(at)tin(dot)it>
To: pgsql-hackers(at)postgresql(dot)org
Subject: attribute distinct values estimate
Date: 1999-10-01 16:11:51
Message-ID: 37F4DD47.C5FA064F@tin.it
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We need to estimate the number of distinct values of an attribute from
inside optimizer, for an extension we are working on.
Should we use stacommonfrac from pg_statistic, or attdisbursion, or what
else?

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