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Tom Lane 9688c4e6f1 Make reduce_outer_joins() smarter about semijoins. 
reduce_outer_joins() mistakenly treated a semijoin like a left join for
purposes of deciding whether not-null constraints created by the join's
quals could be passed down into the join's left-hand side (possibly
resulting in outer-join simplification there).  Actually, semijoin works
like inner join for this purpose, ie, we do not need to see any rows that
can't possibly satisfy the quals.  Hence, two-line fix to treat semi and
inner joins alike.  Per observation by Andres Freund about a performance
gripe from Yazan Suleiman.

Back-patch to 8.4, since this oversight has been there since the current
handling of semijoins was implemented.
2011-01-30 17:04:31 -05:00
config Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
contrib Prevent buffer overrun while parsing an integer in a "query_int" value. 2011-01-27 17:42:39 -05:00
doc Add option to include WAL in base backup 2011-01-30 21:30:09 +01:00
src Make reduce_outer_joins() smarter about semijoins. 2011-01-30 17:04:31 -05:00
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Use -Wformat-security when available 2011-01-27 01:23:48 +02:00
configure.in Use -Wformat-security when available 2011-01-27 01:23:48 +02:00
COPYRIGHT Stamp copyrights for year 2011. 2011-01-01 13:18:15 -05:00
GNUmakefile.in Improved parallel make support 2010-11-12 22:15:16 +02:00
Makefile
README Remove useless whitespace at end of lines 2010-11-23 22:34:55 +02:00
README.git Trivial typo fix. 2010-09-21 14:16:00 -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/.