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Peter Geoghegan 48e1291342 Fix nbtree cleanup-only VACUUM stats inaccuracies. 
Logic for counting heap TIDs from posting list tuples (added by commit
0d861bbb) was faulty.  It didn't count any TIDs/index tuples in the
event of no callback being set.  This meant that we incorrectly counted
no index tuples in clean-up only VACUUMs, which could lead to
pg_class.reltuples being spuriously set to 0 in affected indexes.

To fix, go back to counting items from the page in cases where there is
no callback.  This approach isn't very accurate, but it works well
enough in practice while avoiding the expense of accessing every index
tuple during cleanup-only VACUUMs.

Author: Peter Geoghegan <pg@bowt.ie>
Reported-By: Jehan-Guillaume de Rorthais <jgdr@dalibo.com>
https://postgr.es/m/20201023174451.69e358f1@firost
Backpatch: 13-, where nbtree deduplication was introduced
 		2020-11-04 18:42:27 -08:00
config Remove the option to build thread_test.c outside configure. 2020-10-21 12:08:48 -04:00
contrib Use be_tls_* API for SSL information in sslinfo 2020-11-03 09:47:36 +01:00
doc Declare assorted array functions using anycompatible not anyelement. 2020-11-04 16:09:55 -05:00
src Fix nbtree cleanup-only VACUUM stats inaccuracies. 2020-11-04 18:42:27 -08:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
COPYRIGHT Update copyrights for 2020 2020-01-01 12:21:45 -05:00
GNUmakefile.in Make install-tests target work with vpath builds 2020-05-31 18:33:00 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Remove the option to build thread_test.c outside configure. 2020-10-21 12:08:48 -04:00
configure.ac Remove the option to build thread_test.c outside configure. 2020-10-21 12:08:48 -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:

	https://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
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.