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eaa5808e8e
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Tom Lane eaa5808e8e Redefine MemoryContextReset() as deleting, not resetting, child contexts. 
That is, MemoryContextReset() now means what was formerly meant by
MemoryContextResetAndDeleteChildren(), and the latter is now just a macro
alias for the former.  If you really want the functionality that was
formerly provided by MemoryContextReset(), what you have to do is
MemoryContextResetChildren() plus MemoryContextResetOnly() (which is a
new API to reset *only* the named context and not touch its children).

The reason for this change is that near fifteen years of experience has
proven that there is noplace where old-style MemoryContextReset() is
actually what you want.  Making that the default behavior has led to lots
of context-leakage bugs, while we've not found anyplace where it's actually
necessary to keep the child contexts; at least the standard regression
tests do not reveal anyplace where this change breaks anything.  And there
are upcoming patches that will introduce additional reasons why child
contexts need to be removed.

We could change existing calls of MemoryContextResetAndDeleteChildren to be
just MemoryContextReset, but for the moment I'll leave them alone; they're
not costing anything.
2015-02-27 18:10:04 -05:00
config Speed up CRC calculation using slicing-by-8 algorithm. 2015-02-10 10:54:40 +02:00
contrib Use FLEXIBLE_ARRAY_MEMBER in a number of other places. 2015-02-21 16:12:14 -05:00
doc Fix table_rewrite event trigger for ALTER TYPE/SET DATA TYPE CASCADE 2015-02-27 18:39:53 -03:00
src Redefine MemoryContextReset() as deleting, not resetting, child contexts. 2015-02-27 18:10:04 -05:00
.dir-locals.el
.gitattributes Add functions for dealing with PGP armor header lines to pgcrypto. 2014-10-01 16:03:39 +03:00
.gitignore Update .gitignore for config.cache. 2014-12-18 19:56:42 +09:00
aclocal.m4
configure Speed up CRC calculation using slicing-by-8 algorithm. 2015-02-10 10:54:40 +02:00
configure.in Speed up CRC calculation using slicing-by-8 algorithm. 2015-02-10 10:54:40 +02:00
COPYRIGHT Update copyright for 2015 2015-01-06 11:43:47 -05:00
GNUmakefile.in Add TAP tests for client programs 2014-04-14 21:33:46 -04:00
HISTORY Improve text of stub HISTORY file. 2014-02-12 18:16:17 -05:00
Makefile
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:

	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/.