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Tom Lane f867ce5518 ExecHashRemoveNextSkewBucket must physically copy tuples to main hashtable. Commit `45f6240a8f` added an assumption in ExecHashIncreaseNumBatches and ExecHashIncreaseNumBuckets that they could find all tuples in the main hash table by iterating over the "dense storage" introduced by that patch. However, ExecHashRemoveNextSkewBucket continued its old practice of simply re-linking deleted skew tuples into the main table's hashchains. Hence, such tuples got lost during any subsequent increase in nbatch or nbuckets, and would never get joined, as reported in bug #13908 from Seth P. I (tgl) think that the aforesaid commit has got multiple design issues and should be reworked rather completely; but there is no time for that right now, so band-aid the problem by making ExecHashRemoveNextSkewBucket physically copy deleted skew tuples into the "dense storage" arena. The added test case is able to exhibit the problem by means of fooling the planner with a WHERE condition that it will underestimate the selectivity of, causing the initial nbatch estimate to be too small. Tomas Vondra and Tom Lane. Thanks to David Johnston for initial investigation into the bug report.		2016-02-07 12:29:32 -05:00
config	Install our "missing" script where PGXS builds can find it.	2015-12-11 16:15:05 -05:00
contrib	Add missing "static" qualifier.	2016-02-06 12:21:14 -05:00
doc	Introduce a new GUC force_parallel_mode for testing purposes.	2016-02-07 11:41:33 -05:00
src	ExecHashRemoveNextSkewBucket must physically copy tuples to main hashtable.	2016-02-07 12:29:32 -05:00
.dir-locals.el	emacs: Set indent-tabs-mode in perl-mode	2015-04-12 23:53:23 -04:00
.gitattributes	Add functions for dealing with PGP armor header lines to pgcrypto.	2014-10-01 16:03:39 +03:00
.gitignore	Add .gitignore entries for AIX-specific intermediate build artifacts.	2015-07-08 20:44:22 -04:00
COPYRIGHT	Update copyright for 2016	2016-01-02 13:33:40 -05:00
GNUmakefile.in	Fix distclean/maintainer-clean targets to remove top-level tmp_install dir.	2015-05-13 18:48:05 -04:00
HISTORY	Improve text of stub HISTORY file.	2014-02-12 18:16:17 -05:00
Makefile	Allow make check in PL directories	2011-02-15 06:52:12 +02:00
README	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00
README.git	Don't generate plain-text HISTORY and src/test/regress/README anymore.	2014-02-10 20:48:04 -05:00
aclocal.m4	Replace our hacked version of ax_pthread.m4 with latest upstream version.	2015-07-08 20:36:06 +03:00
configure	Add support for systemd service notifications	2016-02-02 21:04:29 -05:00
configure.in	Add support for systemd service notifications	2016-02-02 21:04:29 -05:00

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.  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/.