Tom Lane a874fe7b4c Refactor the executor's API to support data-modifying CTEs better.
The originally committed patch for modifying CTEs didn't interact well
with EXPLAIN, as noted by myself, and also had corner-case problems with
triggers, as noted by Dean Rasheed.  Those problems show it is really not
practical for ExecutorEnd to call any user-defined code; so split the
cleanup duties out into a new function ExecutorFinish, which must be called
between the last ExecutorRun call and ExecutorEnd.  Some Asserts have been
added to these functions to help verify correct usage.

It is no longer necessary for callers of the executor to call
AfterTriggerBeginQuery/AfterTriggerEndQuery for themselves, as this is now
done by ExecutorStart/ExecutorFinish respectively.  If you really need to
suppress that and do it for yourself, pass EXEC_FLAG_SKIP_TRIGGERS to
ExecutorStart.

Also, refactor portal commit processing to allow for the possibility that
PortalDrop will invoke user-defined code.  I think this is not actually
necessary just yet, since the portal-execution-strategy logic forces any
non-pure-SELECT query to be run to completion before we will consider
committing.  But it seems like good future-proofing.
2011-02-27 13:44:12 -05:00
..

The PostgreSQL contrib tree
---------------------------

This subtree contains porting tools, analysis utilities, and plug-in
features that are not part of the core PostgreSQL system, mainly because
they address a limited audience or are too experimental to be part of
the main source tree.  This does not preclude their usefulness.

User documentation for each module appears in the main SGML documentation.

Most items can be built with `gmake all' and installed with
`gmake install' in the usual fashion, after you have run the `configure'
script in the top-level directory.  Some directories supply new
user-defined functions, operators, or types.  In these cases, after you have
installed the files you need to register the new entities in the database
system by running the commands in the supplied .sql file.  For example,

	$ psql -d dbname -f module.sql

See the PostgreSQL documentation for more information about this
procedure.


Index:
------

adminpack -
	File and log manipulation routines, used by pgAdmin
	by Dave Page <dpage@vale-housing.co.uk>

auth_delay
	Add a short delay after a failed authentication attempt, to make
	brute-force attacks on database passwords a bit harder.
	by KaiGai Kohei <kaigai@ak.jp.nec.com>

auto_explain -
	Log EXPLAIN output for long-running queries
	by Takahiro Itagaki <itagaki.takahiro@oss.ntt.co.jp>

btree_gin -
	Support for emulating BTREE indexing in GIN
	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>

btree_gist -
	Support for emulating BTREE indexing in GiST
	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>

chkpass -
	An auto-encrypted password datatype
	by D'Arcy J.M. Cain <darcy@druid.net>

citext -
	A case-insensitive character string datatype
	by David E. Wheeler <david@kineticode.com>

cube -
	Multidimensional-cube datatype (GiST indexing example)
	by Gene Selkov, Jr. <selkovjr@mcs.anl.gov>

dblink -
	Allows remote query execution
	by Joe Conway <mail@joeconway.com>

dict_int -
	Text search dictionary template for integers
	by Sergey Karpov <karpov@sao.ru>

dict_xsyn -
	Text search dictionary template for extended synonym processing
	by Sergey Karpov <karpov@sao.ru>

earthdistance -
	Functions for computing distances between two points on Earth
	by Bruno Wolff III <bruno@wolff.to> and Hal Snyder <hal@vailsys.com>

file_fdw
	Foreign-data wrapper for server-side CSV/TEXT files
	by Shigeru Hanada <hanada@metrosystems.co.jp>

fuzzystrmatch -
	Levenshtein, metaphone, and soundex fuzzy string matching
	by Joe Conway <mail@joeconway.com> and Joel Burton <jburton@scw.org>

hstore -
	Module for storing (key, value) pairs
	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>

intagg -
	Integer aggregator
	by mlw <markw@mohawksoft.com>

intarray -
	Index support for arrays of int4, using GiST
	by Teodor Sigaev <teodor@sigaev.ru> and Oleg Bartunov <oleg@sai.msu.su>

isn -
	PostgreSQL type extensions for ISBN, ISSN, ISMN, EAN13 product numbers
	by Germ<72>n M<>ndez Bravo (Kronuz) <kronuz@hotmail.com>

lo -
	Large Object maintenance
	by Peter Mount <peter@retep.org.uk>

ltree -
	Tree-like data structures
	by Teodor Sigaev <teodor@sigaev.ru> and Oleg Bartunov <oleg@sai.msu.su>

oid2name -
	Maps numeric files to table names
	by B Palmer <bpalmer@crimelabs.net>

pageinspect -
	Allows inspection of database pages
	Heikki Linnakangas <heikki@enterprisedb.com>

passwordcheck -
	Simple password strength checker
	Laurenz Albe <laurenz.albe@wien.gv.at>

pg_buffercache -
	Real time queries on the shared buffer cache
	by Mark Kirkwood <markir@paradise.net.nz>

pg_freespacemap -
	Displays the contents of the free space map (FSM)
	by Mark Kirkwood <markir@paradise.net.nz>

pg_standby -
	Sample archive_command for warm standby operation
	by Simon Riggs <simon@2ndquadrant.com>

pg_stat_statements -
	Track statement execution times across a whole database cluster
	by Takahiro Itagaki <itagaki.takahiro@oss.ntt.co.jp>

pg_test_fsync -
	Test different wal_sync_method settings
	by Bruce Momjian <bruce@momjian.us>

pg_trgm -
	Functions for determining the similarity of text based on trigram
	matching.
	by Oleg Bartunov <oleg@sai.msu.su> and Teodor Sigaev <teodor@sigaev.ru>

pg_upgrade -
	Support for in-place upgrade between major releases of PostgreSQL
	Bruce Momjian <bruce@momjian.us> and others

pgbench -
	TPC-B like benchmarking tool
	by Tatsuo Ishii <ishii@sraoss.co.jp>

pgcrypto -
	Cryptographic functions
	by Marko Kreen <marko@l-t.ee>

pgrowlocks -
	A function to return row locking information
	by Tatsuo Ishii <ishii@sraoss.co.jp>

pgstattuple -
	Functions to return statistics about "dead" tuples and free
	space within a table
	by Tatsuo Ishii <ishii@sraoss.co.jp>

seg -
	Confidence-interval datatype (GiST indexing example)
	by Gene Selkov, Jr. <selkovjr@mcs.anl.gov>

sepgsql -
	External security provider using SELinux
	by KaiGai Kohei <kaigai@ak.jp.nec.com>

spi -
	Various trigger functions, examples for using SPI.

sslinfo -
	Functions to get information about SSL certificates
	by Victor Wagner <vitus@cryptocom.ru>

start-scripts -
	Scripts for starting the server at boot time on various platforms.

tablefunc -
	Examples of functions returning tables
	by Joe Conway <mail@joeconway.com>

test_parser -
	Sample text search parser
	by Sergey Karpov <karpov@sao.ru>

tsearch2 -
	Compatibility package for the pre-8.3 implementation of text search.
	Pavel Stehule <pavel.stehule@gmail.com>, based on code originally by
	Teodor Sigaev <teodor@sigaev.ru> and Oleg Bartunov <oleg@sai.msu.su>.

unaccent -
	Unaccent dictionary for text search
	Teodor Sigaev <teodor@sigaev.ru> and Oleg Bartunov <oleg@sai.msu.su>.

uuid-ossp -
	UUID generation functions
	by Peter Eisentraut <peter_e@gmx.net>

vacuumlo -
	Remove orphaned large objects
	by Peter T Mount <peter@retep.org.uk>

xml2 -
	Storing XML in PostgreSQL
	by John Gray <jgray@azuli.co.uk>