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Add: 

>
> * Add estimated_count(*) to return an estimate of COUNT(*)
>
>   This would use the planner ANALYZE statistatics to return an estimated
>   count.
This commit is contained in:
Bruce Momjian 2005-11-22 23:06:56 +00:00
parent e96925fba7
commit c28c00ecc8
2 changed files with 11 additions and 2 deletions
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7
doc/TODO
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@ -2,7 +2,7 @@
PostgreSQL TODO List
====================
Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
Last updated: Wed Nov 16 13:44:51 EST 2005
Last updated: Tue Nov 22 17:53:39 EST 2005
The most recent version of this document can be viewed at
http://www.postgresql.org/docs/faqs.TODO.html.
@ -841,6 +841,11 @@ Cache Usage
faster than a sequential scan it must avoid access to the heap
to obtain tuple visibility information.
* Add estimated_count(*) to return an estimate of COUNT(*)
This would use the planner ANALYZE statistatics to return an estimated
count.
* Allow data to be pulled directly from indexes
Currently indexes do not have enough tuple visibility information

6
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: Wed Nov 16 13:44:51 EST 2005
Last updated: Tue Nov 22 17:53:39 EST 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>.
@ -762,6 +762,10 @@ first.
get a count directly from a unique index, but for this to be
faster than a sequential scan it must avoid access to the heap
to obtain tuple visibility information.
</p>
</li><li>Add estimated_count(*) to return an estimate of COUNT(*)
<p> This would use the planner ANALYZE statistatics to return an estimated
count.
</p>
</li><li>Allow data to be pulled directly from indexes
<p> Currently indexes do not have enough tuple visibility information