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170063cd1e
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Tom Lane 170063cd1e Fix estimate_num_groups() to assume that GROUP BY expressions yielding boolean 
results always contribute two groups, regardless of the expression contents.
This is very substantially more accurate than the regular heuristic for
certain boolean tests like "col IS NULL".  Per gripe from Sam Mason.

Back-patch to all supported releases, since the behavior of
estimate_num_groups() hasn't changed all that much since 7.4.
2008-07-07 20:24:55 +00:00
config Modify the recently-added probe for -Wl,--as-needed some more, because RHEL-4 2008-06-27 00:36:16 +00:00
contrib When an ERROR happens on a dblink remote connection, take 2008-07-03 03:56:57 +00:00
doc Added documentation for function xmlagg. 2008-07-07 16:11:35 +00:00
src Fix estimate_num_groups() to assume that GROUP BY expressions yielding boolean 2008-07-07 20:24:55 +00:00
aclocal.m4 Add new auto-detection of thread flags. 2004-04-23 18:15:55 +00:00
configure Modify the recently-added probe for -Wl,--as-needed some more, because RHEL-4 2008-06-27 00:36:16 +00:00
configure.in Modify the recently-added probe for -Wl,--as-needed some more, because RHEL-4 2008-06-27 00:36:16 +00:00
COPYRIGHT Update copyrights in source tree to 2008. 2008-01-01 19:46:01 +00:00
GNUmakefile.in Catch all errors in for and while loops in makefiles. Don't ignore any 2008-03-18 16:24:50 +00:00
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.CVS Some further editorializing on README.CVS. 2004-03-28 06:09:08 +00:00

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/.