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Postgres FD Implementation
Commit 8d86982a authored by Bruce Momjian's avatar Bruce Momjian
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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.
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< * Allow DISTINCT to use hashing like GROUP BY
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doc/TODO
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PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Mon Sep 19 22:21:26 EDT 2005
Last updated: Tue Sep 20 16:51:26 EDT 2005
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
......@@ -939,11 +939,11 @@ Optimizer / Executor
* Have EXPLAIN ANALYZE highlight poor optimizer estimates
* Consider using hash buckets to do DISTINCT, rather than sorting
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.
* Log queries where the optimizer row estimates were dramatically
different from the number of rows actually found?
* Allow DISTINCT to use hashing like GROUP BY
Miscellaneous Performance
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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>
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