422 lines
19 KiB
Plaintext
422 lines
19 KiB
Plaintext
TODO list for PostgreSQL
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========================
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Last updated: Fri Nov 6 22:17:33 EST 1998
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Current maintainer: Bruce Momjian (maillist@candle.pha.pa.us)
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The most recent version of this document can be viewed at
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the PostgreSQL WWW site, http://www.postgreSQL.org.
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THE CHANGES FOR 6.4 APPEAR AT THE END OF THIS DOCUMENT
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A dash(-) marks changes to be in the next release.
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Developers who have claimed items are:
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-------------------------------------
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* Billy is Billy G. Allie <Bill.Allie@mug.org>
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* Brook is Brook Milligan <brook@trillium.NMSU.Edu>
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* Bruce is Bruce Momjian<maillist@candle.pha.pa.us>
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* Bryan is Bryan Henderson<bryanh@giraffe.netgate.net>
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* D'Arcy is D'Arcy J.M. Cain <darcy@druid.net>
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* Dan is Dan McGuirk <mcguirk@indirect.com>
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* Darren is Darren King <darrenk@insightdist.com>
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* David is David Hartwig <daveh@insightdist.com>
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* Edmund is Edmund Mergl <E.Mergl@bawue.de>
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* Goran is Goran Thyni <goran@bildbasen.se>
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* Henry is Henry B. Hotz <hotz@jpl.nasa.gov>
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* Jan is Jan Wieck <wieck@sapserv.debis.de>
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* Jun is Jun Kuwamura <juk@rccm.co.jp>
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* Maarten is Maarten Boekhold <maartenb@dutepp0.et.tudelft.nl>
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* Marc is Marc Fournier <scrappy@hub.org>
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* Martin is Martin S. Utesch <utesch@aut.tu-freiberg.de>
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* Massimo Dal Zotto <dz@cs.unitn.it>
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* Michael is Michael Meskes <meskes@debian.org>
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* Oleg is Oleg Bartunov <oleg@sai.msu.su>
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* Paul is Paul M. Aoki <aoki@CS.Berkeley.EDU>
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* Peter is Peter T Mount <peter@retep.org.uk>
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* Phil is Phil Thompson <phil@river-bank.demon.co.uk>
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* Ryan is Ryan Kirkpatrick <rkirkpat@nag.cs.colorado.edu>
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* Soo-Ho Ok <shok@detc.dongeui-tc.ac.kr>
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* Stefan Simkovics <ssimkovi@rainbow.studorg.tuwien.ac.at>
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* Sven is Sven Verdoolaege <skimo@breughel.ufsia.ac.be>
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* Tatsuo is Tatsuo Ishii <t-ishii@sra.co.jp>
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* Tom is Tom Lane <tgl@sss.pgh.pa.us>
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* Thomas is Thomas Lockhart <tgl@mythos.jpl.nasa.gov>
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* TomH is Tom I Helbekkmo <tih@Hamartun.Priv.NO>
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* Vadim is "Vadim B. Mikheev" <vadim@sable.krasnoyarsk.su>
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Additional 6.4 developers include:
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---------------------------------
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* Jun Kuwamura <juk@rccm.co.jp>
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* Zeugswetter Andreas SARZ <Andreas.Zeugswetter@telecom.at>
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* Soonmyung. Hong <hong@lunaris.hanmesoft.co.kr>
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* Anders Hammarquist <iko@netg.se>
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* Jeroen van Vianen <jeroenv@design.nl>
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* Aldrin L. <aldrin@americasnet.com>
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* Pascal ANDRE <andre@via.ecp.fr>
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* Magnus Hagander <mha@edu.sollentuna.se>
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* Robert Bruccoleri <bruc@pluto.njcc.com>
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* Paul A Vixie <paul@vix.com>
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* Jacek Lasecki <jacek@sound.eti.pg.gda.pl>
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RELIABILITY
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-----------
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* Overhaul mdmgr/smgr to fix double unlinking and double opens, cleanup
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* Overhaul bufmgr/lockmgr/transaction manager
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* Remove EXTEND?
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* Can lo_export()/lo_import() read/write anywhere, causing a security problem?
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* Tables that start with xinv confused to be large objects
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* Two and three dimmensional arrays display improperly, missing {}
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* GROUP BY in INSERT INTO table SELECT * FROM table2 fails
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* Prevent auto-table reference, like SELECT table.col WHERE col = 3 (?)
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* SELECT * FROM table WHERE int4_column = '1' fails
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* SELECT a[1] FROM test fails, it needs test.a[1]
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* UPDATE table SET table.value = 3 fails
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* User who can create databases can modify pg_database table
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* optimizer memory exhaustion with many OR's
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* elog() does not free all its memory(Jan)
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* views on subselects fail
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* disallow inherited columns with the same name as new columns
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* recover or force failure when disk space is exhausted
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* default char() value not to full length crashes server on some OS's
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* allow UPDATE using aggregate to affect all rows, not just one
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* computations in views fail:
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create view test as select usesysid * usesysid from pg_shadow;
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* views containing aggregates sometimes fail(Jan)
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ENHANCEMENTS
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------------
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* Replace table-level locking with row or page-level locking(Vadim)
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* Add SERIAL type
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* Transaction log, so re-do log can be on a separate disk
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* Allow transaction commits with rollback with no-fsync performance
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* More access control over who can create tables and access the database
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* Add full ANSI SQL capabilities
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* add OUTER joins, left and right (Thomas)
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* add INTERSECTS, SUBTRACTS(Stephan)
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* add temporary tables
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* add sql3 recursive unions
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* add the concept of dataspaces
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* add DECIMAL, NUMERIC, DOUBLE PRECISION, BIT, BIT VARYING
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* NCHAR (as distinguished from ordinary varchar),
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* DOMAIN capability
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* Allow compression of large fields or a compressed field type
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* Fix the rules system(Jan,Soo-Ho)
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* add CONSTRAINT
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* Full set of text operations and functions
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* word searches, concat,max() on text, char
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* Large objects
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* Fix large object mapping scheme, own reltype(Peter)
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* Allow large text type to use large objects(Peter)
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* not to stuff everything as files in a single directory
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* Fix large object memory leaks
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* delete orphaned large objects
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* Better interface for adding to pg_group
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* Make MONEY/DECIMAL have a defined precision
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* Fix tables >2G, or report error when 2G size reached
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(fix lseek()/off_t, mdextend()/RELSEG_SIZE)
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* Add REGEX internationalization
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* allow row re-use without vacuum, maybe?(Vadim)
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* Add word index for text fields, maybe with trigrams, i.e.:
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* ' (cat | dog) & ! fox ' meaning text has cat aor dog, but not fox
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* Populate backend status area and write program to dump status data
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* Add ALTER TABLE DROP COLUMN feature
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* Allow INSERT INTO ... SELECT to convert column types
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* Add syslog functionality(Marc)
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* Add STDDEV/VARIANCE() function for standard deviation computation/variance
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* add UNIQUE capability to non-btree indexes
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* make number of backends a config parameter, storage/sinvaladt.h:MaxBackendId
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* certain indexes will not shrink, i.e. oid indexes with many inserts
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* make NULL's come out at the beginning or end depending on the ORDER BY direction
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* change the library/backend interface to use network byte order
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* Restore unused oid's on backend exit if no one else has gotten oids
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* remove non-standard types from the system, and make them loadable
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* have UPDATE/DELETE clean out indexes
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* allow WHERE restriction on ctid
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* allow pg_descriptions when creating types, tables, columns, and functions
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* Fix compile and security of Kerberos/GSSAPI code
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* Allow psql to print nulls as distinct from ""(?)
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* Allow variable casts with BETWEEN 'today'::asbtime AND 'today'::abstime
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* Allow INSERT INTO ... SELECT ... FROM view to work
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* Make VACUUM on database not lock pg_class
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* Make VACUUM ANALYZE only use a readlock
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* Allow cursors to be DECLAREd/OPENed/CLOSEed outside transactions
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* Allow installation data block size and max tuple size configuration(Darren)
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* Allow views on a UNION
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* Allow DISTINCT on view
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* Allow views of aggregate columns
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* Allow variable block sizes(Darren)
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* System tables are now more update-able from SQL(Jan)
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* New pg_shadow file, pg_user is now a view of pg_shadow(Jan)
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* Allow flag to control COPY input/output of NULLs
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* Allow CLUSTER on all tables at once, and improve CLUSTER
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* Change all references of Postgres to PostgreSQL, including binary names
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* Add ELOG_TIMESTAMPS to elog()(?)
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* Change LOCK tablename to LOCK TABLE tablename(?)
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* Allow max tuple length to be changed(Darren)
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* Have psql with no database name not connect to username as default(?)
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* Allow subqueries in target list
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* Granting permissions to another user looses permissions for the owner
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* Allow queries across multiple databases
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* Add replication of distributed databases
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* Allow table destruction/alter to be rolled back
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* Add pg_attribute.atttypmod/Resdom->restypmod to PGresult structure
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* Generate error on CREATE OPERATOR of ~~, ~ and and ~*
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* Allow constraint NULL just as we honor NOT NULL
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* Add version number in startup banners for psql and postmaster
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* Restructure storing of GRANT permission information to allow +-=
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* allow psql \copy to allow delimiters
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* allow international error message support and add error codes
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* allow ORDER BY a function(David)
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* allow usernames with dashes(GRANT fails)
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* add a function to return the last inserted oid, for use in psql scripts
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* allow creation of functional indexes to use default types
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* put sort files, large objects in their on directory
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* CREATE VIEW myview (name) AS SELECT lname FROM wages fails
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* do autocommit so always in a transaction block
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* add SIMILAR TO to allow character classes, 'pg_[a-c]%'
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* allow function isnull(val,'string') to return string if value is null
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* multi-verion concurrency control(Vadim)
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* improve reporting of syntax errors by showing location of error in query
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* allow chaining of pages to allow >8k tuples
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* no min/max for oid type
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* remove un-needed conversion functions
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* redesign the function call interface to handle NULLs better(Jan)
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PERFORMANCE
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-----------
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* Use indexes in ORDER BY for restrictive data sets, min(), max()
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* Allow LIMIT ability on single-table queries that have no ORDER BY or
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a matching index
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* Pull requested data directly from indexes, bypassing heap data
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* Prevent psort() usage when query already using index matching ORDER BY
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* Optimizing disjunctive queries
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* Fix bushy-plans
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* Prevent fsync in SELECT-only queries
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* Cache most recent query plan(s?)
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* Shared catalog cache, reduce lseek()'s by caching table size in shared area
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* Allow compression of log and meta data
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* Add FILLFACTOR to index creation
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* update pg_statistic table to remove operator column
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* make index creation use psort code, because it is now faster(Vadim)
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* remove fork()/exec() of backend and make it just fork()
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* Add base table name to \d index
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* Allow char() not to use variable-sized header to reduce disk size
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* Do async I/O to do better read-ahead of data
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* Fix optmizer problem with self-table joins
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* Fix memory exhaustion when using many OR's
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* Use spin locks only on multi-CPU systems, yield CPU instead
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* Get faster regex() code from Henry Spencer <henry@zoo.utoronto.ca>
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when it is available
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* use mmap() rather than SYSV shared memory(?)
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* use index to restrict rows returned by multi-key index when used with
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non-consecutive keys or OR clauses, so fewer heap accesses
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* use index with constants on functions
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DOCUMENTATION
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-------------
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* Update usermanual source(many)
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* added features used in grammer but not in docs, like :: and CAST
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* Add keyword list to documentation, already in /tools
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* Add 'man pgsql' to show all manual page names
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* Add use of 'const' for varibles in source tree
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=============================================================================
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CHANGES IN THE 6.4 RELEASE
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--------------------------
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Bug Fixes
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---------
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Fix for a tiny memory leak in PQsetdb/PQfinish(Bryan)
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Remove char2-16 data types, use char/varchar(Darren)
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Pqfn not handles a NOTICE message(Anders)
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Reduced busywaiting overhead for spinlocks with many backends (dg)
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Stuck spinlock detection (dg)
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Fix up "ISO-style" timespan decoding and encoding(Thomas)
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Fix problem with table drop after rollback of transaction(Vadim)
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Change error message and remove non-functional update message(Vadim)
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Fix for COPY array checking
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Fix for SELECT 1 UNION SELECT NULL
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Fix for buffer leaks in large object calls(Pascal)
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Change owner from oid to int4 type(Bruce)
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Fix a bug in the oracle compatibility functions btrim() ltrim() and rtrim()
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Fix for shared invalidation cache overflow(Massimo)
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Prevent file descriptor leaks in failed COPY's(Bruce)
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Fix memory leak in libpgtcl's pg_select(Constantin)
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Fix problems with username/passwords over 8 characters(Tom)
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Fix problems with handling of asynchronous NOTIFY in backend(Tom)
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Fix of many bad system table entries(Tom)
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Enhancements
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------------
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Upgrade ecpg and ecpglib,see src/interfaces/ecpc/ChangeLog(Michael)
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Show the index used in an EXPLAIN(Zeugswetter)
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EXPLAIN invokes rule system and shows plan(s) for rewritten queries(Jan)
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Multi-byte awareness of many data types and functions, via configure(Tatsuo)
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New configure --with-mb option(Tatsuo)
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New initdb --pgencoding option(Tatsuo)
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New createdb -E multibyte option(Tatsuo)
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Select version(); now returns PostgreSQL version(Jeroen)
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Libpq now allows asynchronous clients(Tom)
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Allow cancel from client of backend query(Tom)
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Psql now cancels query with Control-C(Tom)
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Libpq users need not issue dummy queries to get NOTIFY messages(Tom)
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NOTIFY now sends sender's PID, so you can tell whether it was your own(Tom)
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PGresult struct now includes associated error message, if any(Tom)
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Define "tz_hour" and "tz_minute" arguments to date_part()(Thomas)
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Add routines to convert between varchar and bpchar(Thomas)
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Add routines to allow sizing of varchar and bpchar into target columns(Thomas)
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Add bit flags to support timezonehour and minute in data retrieval(Thomas)
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Allow more variations on valid floating point numbers (e.g. ".1", "1e6")(Thomas)
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Fixes for unary minus parsing with leading spaces(Thomas)
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Implement TIMEZONE_HOUR, TIMEZONE_MINUTE per SQL92 specs(Thomas)
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Check for and properly ignore FOREIGN KEY column constraints(Thomas)
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Define USER as synonym for CURRENT_USER per SQL92 specs(Thomas)
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Enable HAVING clause but no fixes elsewhere yet.
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Make "char" type a synonym for "char(1)" (actually implemented as bpchar)(Thomas)
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Save string type if specified for DEFAULT clause handling(Thomas)
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Coerce operations involving different data types(Thomas)
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Allow some index use for columns of different types(Thomas)
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Add capabilities for automatic type conversion(Thomas)
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Cleanups for large objects, so file is truncated on open(Peter)
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Readline cleanups(Tom)
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Allow psql \f \ to make spaces as delimiter(Bruce)
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Pass pg_attribute.atttypmod to the frontend for column field lengths(Tom,Bruce)
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Msql compatibility library in /contrib(Aldrin)
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Remove the requirement that ORDER/GROUP BY clause identifiers be
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included in the target list(David)
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Convert columns to match columns in UNION clauses(Thomas)
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Remove fork()/exec() and only do fork()(Bruce)
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Jdbc cleanups(Peter)
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Show backend status on ps command line(only works on some platforms)(Bruce)
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Pg_hba.conf now has a sameuser option in the database field
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Make lo_unlink take oid param, not int4
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New DISABLE_COMPLEX_MACRO for compilers that can't handle our macros(Bruce)
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Libpgtcl now handles NOTIFY as a Tcl event, need not send dummy queries(Tom)
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libpgtcl cleanups(Tom)
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Add -error option to libpgtcl's pg_result command(Tom)
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New locale patch, see docs/README/locale(Oleg)
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Fix for pg_dump so CONSTRAINT and CHECK syntax is correct(ccb)
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New contrib/lo code for large object orphan removal(Peter)
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New psql command "SET CLIENT_ENCODING TO 'encoding'" for multi-bytes
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feature, see /doc/README.mb(Tatsuo)
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/contrib/noupdate code to revoke update permission on a column
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Libpq can now be compiled on win32(Magnus)
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Add PQsetdbLogin() in libpq
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New 8-byte integer type, checked by configure for OS support(Thomas)
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Better support for quoted table/column names(Thomas)
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Surround table and column names with double-quotes in pg_dump(Thomas)
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PQreset() now works with passwords(Tom)
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Handle case of GROUP BY target list column number out of range(David)
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Allow UNION in subselects
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Add auto-size to screen to \d? commands(Bruce)
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Use UNION to show all \d? results in one query(Bruce)
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Add \d? field search feature(Bruce)
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Pg_dump issues fewer \connect requests(Tom)
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Make pg_dump -z flag work better, document it in manual page(Tom)
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Add HAVING clause with full support for subselects and unions(Stephan)
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Full text indexing routines in contrib/fulltextindex(Maarten)
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Transaction ids now stored in shared memory(Vadim)
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New PGCLIENTENCODING when issuing COPY command(Tatsuo)
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Support for SQL92 syntax "SET NAMES"(Tatsuo)
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Support for LATIN2-5(Tatsuo)
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Add UNICODE regression test case(Tatsuo)
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Lock manager cleanup, new locking modes for LLL(Vadim)
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Allow index use with OR clauses(Bruce)
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Allows "SELECT NULL ORDER BY 1;"
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Explain VERBOSE prints the plan, and now pretty-prints the plan to
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the postmaster log file(Bruce)
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Add Indices display to \d command(Bruce)
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Allow GROUP BY on functions(David)
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New pg_class.relkind for large objects(Bruce)
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New way to send libpq NOTICE messages to a different location(Tom)
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New \w write command to psql(Bruce)
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New /contrib/findoidjoins scans oid columns to find join relationships(Bruce)
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Allow binary-compatible indices to be considered when checking for valid
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indices for restriction clauses containing a constant(Thomas)
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New ISBN/ISSN code in /contrib/isbn_issn
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Allow NOT LIKE, IN, NOT IN, BETWEEN, and NOT BETWEEN constraint(Thomas)
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New rewrite system fixes many problems with rules and views(Jan)
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* Rules on relations work
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* Event qualifications on insert/update/delete work
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* New OLD variable to reference CURRENT, CURRENT will be remove in future
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* Update rules can reference NEW and OLD in rule qualifications/actions
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* Insert/update/delete rules on views work
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* Multiple rule actions are now supported, surrounded by parentheses
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* Regular users can create views/rules on tables they have RULE permits
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* Rules and views inherit the permissions on the creator
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* No rules at the column level
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* No UPDATE NEW/OLD rules
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* New pg_tables, pg_indexes, pg_rules and pg_views system views
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* Only a single action on SELECT rules
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* Total rewrite overhaul, perhaps for 6.5
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* handle subselects
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* handle aggregates on views
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* handle insert into select from view works
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System indexes are now multi-key(Bruce)
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Oidint2, oidint4, and oidname types are removed(Bruce)
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Use system cache for more system table lookups(Bruce)
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New backend programming language PL/pgSQL in backend/pl(Jan)
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New SERIAL data type, auto-creates sequence/index(Thomas)
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Enable assert checking without a recompile(Massimo)
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User lock enhancements(Massimo)
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New setval() command to set sequence value(Massimo)
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Auto-remove unix socket file on startup if no postmaster running(Massimo)
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Conditional trace package(Massimo)
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New UNLISTEN command(Massimo)
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Psql and libpq now compile under win32 using win32.mak(Magnus)
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Lo_read no longer stores trailing NULL(Bruce)
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Identifiers are now truncated to 31 characters internally(Bruce)
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Createuser options now availble on the command line
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Code for 64-bit integer supported added, configure tested, int8 type(Thomas)
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Prevent file descriptor leaf from failed COPY(Bruce)
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New pg_upgrade command(Bruce)
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Updated /contrib directories(Massimo)
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New CREATE TABLE DEFAULT VALUES statement available(Thomas)
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New INSERT INTO TABLE DEFAULT VALUES statement available(Thomas)
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New DECLARE and FETCH feature(Thomas)
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libpq's internal structures now not exported(Tom)
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Allow up to 8 key indexes(Bruce)
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Remove ARCHIVE keyword, that is no longer used(Thomas)
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pg_dump -n flag to supress quotes around indentifiers
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disable system columns for views(Jan)
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new INET and CIDR types for network addresses(TomH, Paul)
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no more double quotes in psql output
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pg_dump now dumps views(Terry)
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new SET QUERY_LIMIT(Tatsuo,Jan)
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Source Tree Changes
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-------------------
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/contrib cleanup(Jun)
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Inline some small functions called for every row(Bruce)
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Alpha/linux fixes
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Hp/UX cleanups(Tom)
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Multi-byte regression tests(Soonmyung.)
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Remove --disabled options from configure
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Define PGDOC to use POSTGRESDIR by default
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Make regression optional
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Remove extra braces code to pgindent(Bruce)
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Add bsdi shared library support(Bruce)
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New --without-CXX support configure option(Brook)
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New FAQ_CVS
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Update backend flowchart in tools/backend(Bruce)
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Change atttypmod from int16 to int32(Bruce, Tom)
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Getrusage() fix for platforms that do not have it(Tom)
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Add PQconnectdb, PGUSER, PGPASSWORD to libpq man page
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NS32K platform fixes(Phil Nelson, John Buller)
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Sco 7/UnixWare 2.x fixes(Billy,others)
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Sparc/Solaris 2.5 fixes(Ryan)
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Pgbuiltin.3 is obsolete, move to doc files(Thomas)
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Even more documention(Thomas)
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Nextstep support(Jacek)
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Aix support(David)
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pginterface manual page(Bruce)
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shared libraries all have version numbers
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merged all OS-specific shared library defines into one file
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smarter TCL/TK configuration checking(Billy)
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smarter perl configuration(Brook)
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configure uses supplied install-sh if no install script found(Tom)
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new Makefile.shlib for shared library configuration(Tom)
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