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Tom Lane eb919e8fde Resurrect the "last ditch" code path in join_search_one_level(). This essentially reverts commit `e54b10a62d`, in which I'd decided that the "last ditch" join logic was useless. The folly of that is now exposed by a report from Pavel Stehule: although the function should always find at least one join in a self-contained join problem, it can still fail to do so in a sub-problem created by artificial from_collapse_limit or join_collapse_limit constraints. Adjust the comments to describe this, and simplify the code a bit to match the new coding of the earlier loop in the function. I'm not terribly happy about this: I still subscribe to the opinion stated in the previous commit message that the "last ditch" code can obscure logic bugs elsewhere. But the alternative seems to be to complicate the earlier tests for does-this-relation-have-a-join-clause to the point where they can tell whether the join clauses link outside the current join sub-problem. And that looks messy, slow, and possibly a source of bugs in itself. In any case, now is not the time to be inserting experimental code into 9.2, so let's just go back to the time-tested solution.		2012-08-15 00:08:13 -04:00
config	Put back AC_REQUIRE([AC_STRUCT_TM]).	2012-05-14 23:06:48 -04:00
contrib	Prevent access to external files/URLs via contrib/xml2's xslt_process().	2012-08-14 18:31:18 -04:00
doc	Add more limited large object trigger example.	2012-08-14 23:25:20 -04:00
src	Resurrect the "last ditch" code path in join_search_one_level().	2012-08-15 00:08:13 -04:00
.gitignore	Add gitignore for mingw/cygwin build outputs	2011-06-09 18:11:47 +02:00
COPYRIGHT	Update copyright notices for year 2012.	2012-01-01 18:01:58 -05:00
GNUmakefile.in	Make init-po and update-po recursive make targets	2012-06-29 14:01:54 +03:00
Makefile	Allow make check in PL directories	2011-02-15 06:52:12 +02:00
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
aclocal.m4	Remove cvs keywords from all files.	2010-09-20 22:08:53 +02:00
configure	Add fsync capability to initdb, and use sync_file_range() if available.	2012-07-13 17:16:58 -04:00
configure.in	Add fsync capability to initdb, and use sync_file_range() if available.	2012-07-13 17:16:58 -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/.