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In general, datatype I/O functions are supposed to be immutable or at worst stable. Some contrib I/O functions were, through oversight, not marked with any volatility property at all, which made them VOLATILE. Since (most of) these functions actually behave immutably, the erroneous marking isn't terribly harmful; but it can be user-visible in certain circumstances, as per a recent bug report from Joe Van Dyk in which a cast to text was disallowed in an expression index definition. To fix, just adjust the declarations in the extension SQL scripts. If we were being very fussy about this, we'd bump the extension version numbers, but that seems like more trouble (for both developers and users) than the problem is worth. A fly in the ointment is that chkpass_in actually is volatile, because of its use of random() to generate a fresh salt when presented with a not-yet-encrypted password. This is bad because of the general assumption that I/O functions aren't volatile: the consequence is that records or arrays containing chkpass elements may have input behavior a bit different from a bare chkpass column. But there seems no way to fix this without breaking existing usage patterns for chkpass, and the consequences of the inconsistency don't seem bad enough to justify that. So for the moment, just document it in a comment. Since we're not bumping version numbers, there seems no harm in back-patching these fixes; at least future installations will get the functions marked correctly.
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 Germán Méndez 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>