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Update for Oleg:
> using a sequential scan for highest/lowest values (Oleg)
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TODO list for PostgreSQL
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========================
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Last updated: Wed Apr 17 23:58:08 EDT 2002
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Last updated: Thu Apr 18 00:04:58 EDT 2002
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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@ -435,7 +435,7 @@ OPTIMIZER / EXECUTOR
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* Make IN/NOT IN have similar performance to EXISTS/NOT EXISTS [exists]
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* Missing optimizer selectivities for date, r-tree, etc. [optimizer]
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* Allow ORDER BY ... LIMIT to select top values without sort or index
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using a sequential scan for highest/lowest values
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using a sequential scan for highest/lowest values (Oleg)
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* Inline simple SQL functions to avoid overhead (Tom)
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* Precompile SQL functions to avoid overhead (Neil Conway)
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* Add utility to compute accurate random_page_cost value
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