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Commit8d86982

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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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‎doc/TODO

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PostgreSQL TODO List
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====================
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Current maintainer:Bruce Momjian (pgman@candle.pha.pa.us)
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Last updated:Mon Sep19 22:21:26 EDT 2005
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Last updated:Tue Sep20 16:51:26 EDT 2005
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The most recent version of this document can be viewed at
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http://www.postgresql.org/docs/faqs.TODO.html.
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* Have EXPLAIN ANALYZE highlight poor optimizer estimates
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* Consider using hash buckets to do DISTINCT, rather than sorting
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This would be beneficial when there are few distinct values.
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This would be beneficial when there are few distinct values. This is
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already used by GROUP BY.
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* Log queries where the optimizer row estimates were dramatically
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different from the number of rows actually found?
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* Allow DISTINCT to use hashing like GROUP BY
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Miscellaneous Performance

‎doc/src/FAQ/TODO.html

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<bodybgcolor="#FFFFFF"text="#000000"link="#FF0000"vlink="#A00000"alink="#0000FF">
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<h1><aname="section_1">PostgreSQL TODO List</a></h1>
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<p>Current maintainer: Bruce Momjian (<ahref="mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</a>)<br/>
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</p>
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<p>The most recent version of this document can be viewed at<br/>
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<ahref="http://www.postgresql.org/docs/faqs.TODO.html">http://www.postgresql.org/docs/faqs.TODO.html</a>.
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</li><li>Improve ability to display optimizer analysis using OPTIMIZER_DEBUG
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</li><li>Have EXPLAIN ANALYZE highlight poor optimizer estimates
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</li><li>Consider using hash buckets to do DISTINCT, rather than sorting
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<p> This would be beneficial when there are few distinct values.
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<p> This would be beneficial when there are few distinct values. This is
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already used by GROUP BY.
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</p>
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</li><li>Log queries where the optimizer row estimates were dramatically
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different from the number of rows actually found?
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</li><li>Allow DISTINCT to use hashing like GROUP BY
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</li></ul>
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<h1><aname="section_21">Miscellaneous Performance</a></h1>
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