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Peter Geoghegan 9b42e71376 Don't leave behind junk nbtree pages during split. Commit `8fa30f906b` reduced the elevel of a number of "can't happen" _bt_split() errors from PANIC to ERROR. At the same time, the new right page buffer for the split could continue to be acquired well before the critical section. This was possible because it was relatively straightforward to make sure that _bt_split() could not throw an error, with a few specific exceptions. The exceptional cases were safe because they involved specific, well understood errors, making it possible to consistently zero the right page before actually raising an error using elog(). There was no danger of leaving around a junk page, provided _bt_split() stuck to this coding rule. Commit `8224de4f`, which introduced INCLUDE indexes, added code to make _bt_split() truncate away non-key attributes. This happened at a point that broke the rule around zeroing the right page in _bt_split(). If truncation failed (perhaps due to palloc() failure), that would result in an errant right page buffer with junk contents. This could confuse VACUUM when it attempted to delete the page, and should be avoided on general principle. To fix, reorganize _bt_split() so that truncation occurs before the new right page buffer is even acquired. A junk page/buffer will not be left behind if _bt_nonkey_truncate()/_bt_truncate() raise an error. Discussion: https://postgr.es/m/CAH2-WzkcWT_-NH7EeL=Az4efg0KCV+wArygW8zKB=+HoP=VWMw@mail.gmail.com Backpatch: 11-, where INCLUDE indexes were introduced.		2019-05-13 10:27:59 -07:00
config	Update config.guess and config.sub	2019-04-27 14:25:00 +02:00
contrib	postgres_fdw: Fix typo in comment.	2019-05-13 17:30:35 +09:00
doc	doc: PG 12 release notes: normalize attribution names	2019-05-12 23:54:02 -04:00
src	Don't leave behind junk nbtree pages during split.	2019-05-13 10:27:59 -07:00
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	2019-01-13 11:32:31 -08:00
.gitattributes	doc: Add some images	2019-03-27 23:10:23 +01:00
.gitignore	Support for optimizing and emitting code in LLVM JIT provider.	2018-03-22 11:05:22 -07:00
aclocal.m4	Fix configure's AC_CHECK_DECLS tests to work correctly with clang.	2018-11-19 12:01:47 -05:00
configure	Reorder configure tests for accept() in Windows	2019-03-04 14:42:12 -05:00
configure.in	Fix PERMIT_DECLARATION_AFTER_STATEMENT initialization.	2019-02-16 13:12:28 -08:00
COPYRIGHT	Update copyright for 2019	2019-01-02 12:44:25 -05:00
GNUmakefile.in	Process EXTRA_INSTALL serially, during the first temp-install.	2018-12-31 13:54:38 -08:00
HISTORY
Makefile	Fix non-GNU makefiles for AIX make.	2017-11-30 00:57:22 -08:00
README
README.git

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/.