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< * Allow ORDER BY ... LIMIT 1 to select high/low value without sort or
<   index using a sequential scan for highest/lowest values
<
<   If only one value is needed, there is no need to sort the entire
<   table. Instead a sequential scan could get the matching value.
<
REL8_1_STABLE
Bruce Momjian 21 years ago
parent 1207d5b64e
commit 6869683147
2 changed files with 2 additions and 13 deletions
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  1. 8
      doc/TODO
  2. 7
      doc/src/FAQ/TODO.html

8
doc/TODO
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@ -2,7 +2,7 @@
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Sat Apr 23 17:41:00 EDT 2005
Last updated: Sat Apr 23 17:43:18 EDT 2005
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -858,12 +858,6 @@ Optimizer / Executor
====================
* Add missing optimizer selectivities for date, r-tree, etc
* Allow ORDER BY ... LIMIT 1 to select high/low value without sort or
index using a sequential scan for highest/lowest values
If only one value is needed, there is no need to sort the entire
table. Instead a sequential scan could get the matching value.
* Precompile SQL functions to avoid overhead
* Create utility to compute accurate random_page_cost value
* Improve ability to display optimizer analysis using OPTIMIZER_DEBUG

7
doc/src/FAQ/TODO.html
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@ -8,7 +8,7 @@
<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: Sat Apr 23 17:41:00 EDT 2005
Last updated: Sat Apr 23 17:43:18 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>.
@ -782,11 +782,6 @@ first.
<ul>
<li>Add missing optimizer selectivities for date, r-tree, etc
</li><li>Allow ORDER BY ... LIMIT 1 to select high/low value without sort or
index using a sequential scan for highest/lowest values
<p> If only one value is needed, there is no need to sort the entire
table. Instead a sequential scan could get the matching value.
</p>
</li><li>Precompile SQL functions to avoid overhead
</li><li>Create utility to compute accurate random_page_cost value
</li><li>Improve ability to display optimizer analysis using OPTIMIZER_DEBUG

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