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Tom Lane 46f775144e Improve eqjoinsel's ndistinct clamping to work for multiple levels of join. 
This patch fixes an oversight in my commit
7f3eba30c9 of 2008-10-23.  That patch
accounted for baserel restriction clauses that reduced the number of rows
coming out of a table (and hence the number of possibly-distinct values of
a join variable), but not for join restriction clauses that might have been
applied at a lower level of join.  To account for the latter, look up the
sizes of the min_lefthand and min_righthand inputs of the current join,
and clamp with those in the same way as for the base relations.

Noted while investigating a complaint from Ben Chobot, although this in
itself doesn't seem to explain his report.

Back-patch to 8.4; previous versions used different estimation methods
for which this heuristic isn't relevant.
2011-08-31 16:05:05 -04:00
config Suppress -arch switches in the output of ExtUtils::Embed. 2011-06-14 17:13:58 -04:00
contrib Fix pgstatindex() to give consistent results for empty indexes. 2011-08-24 23:50:25 -04:00
doc Fix typo in sslmode documentation 2011-07-05 09:46:42 +02:00
src Improve eqjoinsel's ndistinct clamping to work for multiple levels of join. 2011-08-31 16:05:05 -04:00
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:08 +02:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Suppress -arch switches in the output of ExtUtils::Embed. 2011-06-14 17:13:58 -04:00
configure.in Tag 8.4.8. 2011-04-15 00:17:14 -03:00
COPYRIGHT Update copyright for 2009. 2009-01-01 17:24:05 +00:00
GNUmakefile.in Back-patch creation of tar.bz2 tarball during "make dist". 2011-07-03 16:40:28 -04:00
Makefile Remove remains of old depend target. 2007-01-20 17:16:17 +00:00
README Point to our download URL, rather than listing interface in the README 2008-05-06 22:02:12 +00:00
README.git Back-patch replacement of README.CVS with README.git. 2010-09-21 14:43:06 -04:00

README 

PostgreSQL Database Management System
=====================================
  
This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	http://www.postgresql.org/download

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Changes between all PostgreSQL releases are recorded in the
file HISTORY.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
http://www.postgresql.org/download/.  For more information look at our
web site located at http://www.postgresql.org/.