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> * Consider using hash buckets to do DISTINCT, rather than sorting
>
>   This would be beneficial when there are few distinct values.
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Bruce Momjian 2004-09-02 01:18:46 +00:00
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@ -5,7 +5,7 @@ TODO list for PostgreSQL
Bracketed items "[]" have more detail. Bracketed items "[]" have more detail.
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us) Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Mon Aug 30 12:08:12 EDT 2004 Last updated: Wed Sep 1 21:18:44 EDT 2004
The most recent version of this document can be viewed at the PostgreSQL web site, http://www.PostgreSQL.org. The most recent version of this document can be viewed at the PostgreSQL web site, http://www.PostgreSQL.org.
@ -802,6 +802,9 @@ Optimizer / Executor
CHECK constraints contain information about the distribution of values CHECK constraints contain information about the distribution of values
within the table. This is also useful for implementing subtables where within the table. This is also useful for implementing subtables where
a tables content is distributed across several subtables. a tables content is distributed across several subtables.
* Consider using hash buckets to do DISTINCT, rather than sorting
This would be beneficial when there are few distinct values.
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