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<   This would be beneficial when there are few distinct values.
>   This would be beneficial when there are few distinct values.  This is
>   already used by GROUP BY.
946d946
< * Allow DISTINCT to use hashing like GROUP BY
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Bruce Momjian
2005-09-20 20:51:30 +00:00
parent b7159824e6
commit 8d86982a11
2 changed files with 6 additions and 6 deletions
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doc/src/FAQ/TODO.html
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<body bgcolor="#FFFFFF" text="#000000" link="#FF0000" vlink="#A00000" alink="#0000FF">
<h1><a name="section_1">PostgreSQL TODO List</a></h1>
<p>Current maintainer: Bruce Momjian (<a href="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/>
Last updated: Mon Sep 19 22:21:26 EDT 2005
Last updated: Tue Sep 20 16:51:26 EDT 2005
</p>
<p>The most recent version of this document can be viewed at<br/>
<a href="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
@ -851,11 +851,11 @@ first.
</li><li>Improve ability to display optimizer analysis using OPTIMIZER_DEBUG
</li><li>Have EXPLAIN ANALYZE highlight poor optimizer estimates
</li><li>Consider using hash buckets to do DISTINCT, rather than sorting
<p> This would be beneficial when there are few distinct values.
<p> This would be beneficial when there are few distinct values. This is
already used by GROUP BY.
</p>
</li><li>Log queries where the optimizer row estimates were dramatically
different from the number of rows actually found?
</li><li>Allow DISTINCT to use hashing like GROUP BY
</li></ul>
<h1><a name="section_21">Miscellaneous Performance</a></h1>