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Tom Lane 0f61d4dd1b Improve relation width estimation for subqueries. 
As per the ancient comment for set_rel_width, it really wasn't much good
for relations that aren't plain tables: it would never find any stats and
would always fall back on datatype-based estimates, which are often pretty
silly.  Fix that by copying up width estimates from the subquery planning
process.

At some point we might want to do this for CTEs too, but that would be a
significantly more invasive patch because the sub-PlannerInfo is no longer
accessible by the time it's needed.  I refrained from doing anything about
that, partly for fear of breaking the unmerged CTE-related patches.

In passing, also generate less bogus width estimates for whole-row Vars.

Per a gripe from Jon Nelson.
 		2010-11-19 17:31:50 -05:00
config find -path is not portable, so use grep -v instead. 2010-10-25 10:04:00 -03:00
contrib Fix bug in cube picksplit algorithm. 2010-11-14 21:27:34 -05:00
doc Add pg_describe_object function 2010-11-18 17:06:19 -03:00
src Improve relation width estimation for subqueries. 2010-11-19 17:31:50 -05:00
.gitignore Convert cvsignore to gitignore, and add .gitignore for build targets. 2010-09-22 12:57:04 +02:00
COPYRIGHT Update copyright for the year 2010. 2010-01-02 16:58:17 +00:00
GNUmakefile.in Improved parallel make support 2010-11-12 22:15:16 +02:00
Makefile Add new make targets "world", "install-world" and "installcheck-world" to build, install and check just about everything. 2010-01-28 23:59:52 +00:00
README Remove extra newlines at end and beginning of files, add missing newlines 2010-08-19 05:57:36 +00:00
README.git Trivial typo fix. 2010-09-21 14:16:00 -04:00
aclocal.m4 Remove cvs keywords from all files. 2010-09-20 22:08:53 +02:00
configure Add/fix caching on some configure checks 2010-09-29 22:38:04 +03:00
configure.in Add/fix caching on some configure checks 2010-09-29 22:38:04 +03:00

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/.