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485 lines
22 KiB
Plaintext
TODO list for PostgreSQL
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========================
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Last updated: Tue Apr 7 16:56:24 EDT 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 6.3 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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* 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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* Daniel is Daniel Kalchev <daniel@digsys.bg>
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* Darren is Darren King <darrenk@insightdist.com>
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* Edmund is Edmund Mergl <E.Mergl@bawue.de>
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* Erich Stamberger <eberger@gewi.kfunigraz.ac.at>
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* Gerhard is Gerhard Reithofer <gerhardr@tech-edv.co.at>
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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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* Igor is Igor <igor@sba.miami.edu>
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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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* Kurt is "Kurt J. Lidl" <lidl@va.pubnix.com>
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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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* 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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* Patrick is Patrick van Kleef <pvk@pobox.com>
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* Peter is Peter T Mount <psqlhack@maidast.demon.co.uk>
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* Phil is Phil Thompson <phil@river-bank.demon.co.uk>
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* Raymond is Raymond Toy <toy@rtp.ericsson.se>
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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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* Thomas is Thomas Lockhart <tgl@mythos.jpl.nasa.gov>
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* Todd is Todd Brandys is <brandys@eng3.hep.uiuc.edu>
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* Vadim is "Vadim B. Mikheev" <vadim@sable.krasnoyarsk.su>
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* Vivek is Vivek Khera <khera@kci.kciLink.com>
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Additional 6.3 developers include:
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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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* James is James Hughes <jamesh@interpath.com>
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* Jeroen is Jeroen van Vianen <jeroenv@design.nl>
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* Matt is Matt Maycock <maycock@intelliquest.com>
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* Ryan is Ryan Kirkpatrick <rkirkpat@nag.cs.colorado.edu>
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* TomH is Tom I Helbekkmo <tih@Hamartun.Priv.NO>
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* TomS is Tom Szybist
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* Travis is Travis Melhiser <melhiser@viper.co.union.nc.us>
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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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* CREATE VIEW requires super-user priviledge
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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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* Make pg_dump preserve inheritance column order, do non-inherits first
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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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* -DISTINCT not on last query fails on UNION but not UNION ALL
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* Negative constants used with int2 or float4 columns fails
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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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* -Implement HAVING clause(Stephan)
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* add OUTER joins, left and right (Thomas)
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* make VIEWs updateable where possible
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* add INTERSECTS, SUBTRACTS(Stephan)
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* add temporary tables(Bruce)
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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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* robust
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* making INSTEAD rules work
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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
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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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* 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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* Threaded version of the server or libpq
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* Allow libpq to cancel query requests
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* Add REGEX internationalization
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* allow row re-use without vacuum, maybe?(Vadim)
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* Remove restriction that ORDER BY field must be in SELECT list
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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 or 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 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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PERFORMANCE
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-----------
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* Use indexes in ORDER BY, min(), max()(Costin Oproiu)
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* Optimizing disjunctive queries
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* Fix bushy-plans (Martin)
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* Other optimizer bugs
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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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* Allow indexes to be used with OR clauses(Vadim)
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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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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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* update libpq++ and pginterface manual page
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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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=============================================================================
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CHANGES IN THE 6.3.2 PATCH
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--------------------------
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configure detection improvements for tcl/tk(Brook Milligan, Alvin)
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Manual page improvements(Bruce)
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BETWEEN and LIKE fix(Thomas)
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fix for psql \connect used by pg_dump(Oliver Elphick)
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Cleanup of postodbc source code indentation
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pgaccess, version 0.86
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HAVING clause now supported in SELECT(Stefan)
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qsort removed, now uses libc version, cleanups(Jeroen)
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fix for buffer over-runs detected(Maurice Gittens)
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fix for buffer overrun in libpgtcl(Randy Kunkee)
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fix for UNION with DISTINCT or ORDER BY(Bruce)
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gettimeofday configure check(Doug Winterburn)
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Fix "indexes not used" bug(Vadim)
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docs additions(Thomas)
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Fix for backend memory leak(Bruce)
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libreadline cleanup(Erwan MAS)
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Remove DISTDIR(Bruce)
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Makefile dependency cleanup(Jeroen van Vianen)
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ASSERT fixes(Bruce)
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CHANGES IN THE 6.3.1 PATCH
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--------------------------
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ecpg cleanup/fixes, now version 1.1(Michael Meskes)
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pg_user cleanup(Bruce)
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large object fix for pg_dump and tclsh(alvin@camberlo.demon.co.uk)
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LIKE fix for multiple adjacent underscores
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LIKE/BETWEEN fix for having function call as target(Thomas)
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fix for redefining builtin functions(Thomas)
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ultrix4 cleanup
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upgrade to pg_access 0.83
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updated CLUSTER manual page
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multi-byte character set support, see doc/README.mb(Tatsuo)
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configure --with-pgport fix
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pg_ident fix
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big-endian fix for backend communications(Kataoka)
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SUBSTR() and substring() fix(Jan)
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several jdbc fixes(Peter)
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libpgtcl improvements, see libptcl/README(Randy Kunkee)
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Fix for "Datasize = 0" error(Vadim)
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Prevent \do from wrapping(Bruce)
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Remove duplicate Russian character set entries
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Sunos4 cleanup
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Allow optional TABLE keyword in LOCK and SELECT INTO(Thomas)
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CREATE SEQUENCE options to allow a negative integer(Thomas)
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Add "PASSWORD" as an allowed column identifier(Thomas)
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Add checks for UNION target fields(Bruce)
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Fix Alpha port(Dwayne Bailey)
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Fix for text arrays containing quotes(Doug Gibson)
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Solaris compile fix(Albert Chin-A-Young)
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Better identify tcl and tk libs and includes(Bruce)
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CHANGES IN THE 6.3 RELEASE
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--------------------------
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There are some general 6.3 issues that I want to mention. These are
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only the big items that can not be described in one sentence.
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First, we now have subselects. Now that we have them, I would like to
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mention that without subselects, SQL is a very limited language.
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Subselects are a major feature, and you should review your code for
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places where subselects provide a better solution for your queries. I
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think you will find that there are more uses for subselects than you may
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think. Vadim has put us on the big SQL map with subselects, and fully
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functional ones too. The only thing you can't do with subselects is to
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use them in the target list.
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Second, 6.3 uses unix domain sockets rather than TCP/IP by default. To
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enable connections from other machines, you have to use the new
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postmaster -i option, and of course edit pg_hba.conf. Also, for this
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reason, the format of pg_hba.conf has changed.
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Third, char() fields will now allow faster access than varchar() or
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text. Specifically, the text and varchar() have a penalty for access to
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any columns after the first column of this type. char() used to also
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have this access penalty, but it no longer does. This may suggest that
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you redesign some of your tables, especially if you have short character
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columns that you have defined as varchar() or text. This and other
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changes make 6.3 even faster than earlier releases.
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We now have passwords definable independent of any Unix file. There are
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new SQL USER commands. See the pg_hba.conf manual page for more
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information. There is a new table, pg_shadow, which is used to store
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user information and user passwords, and it by default only SELECT-able
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by the postgres super-user. pg_user is now a view of pg_shadow, and is
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SELECT-able by PUBLIC. You should keep using pg_user in your
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application without changes.
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User-created tables now no longer have SELECT permission to PUBLIC by
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default. This was done because the ANSI standard requires it. You can
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of course GRANT any permissions you want after the table is created.
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System tables continue to be SELECT-able by PUBLIC.
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We also have real deadlock detection code. No more sixty-second
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timeouts. And the new locking code implements a FIFO better, so there
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should be less resource starvation during heavy use.
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Many complaints have been made about inadequate documenation in previous
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releases. Thomas has put much effort into many new manuals for this
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release. Check out the /doc directory.
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For performance reasons, time travel is gone, but can be implemented
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using triggers (see pgsql/contrib/spi/README). Please check out the new
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\d command for types, operators, etc. Also, views have their own
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permissions now, not based on the underlying tables, so permissions on
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them have to be set separately. Check /pgsql/interfaces for some new
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ways to talk to PostgreSQL.
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This is the first release that really required an explaination for
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existing users. In many ways, this was necessary because the new
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release removes many limitations, and the work-arounds people were using
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are no longer needed.
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Bug Fixes
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---------
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Fix binary cursors broken by MOVE implementation(Vadim)
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Fix for tcl library crash(Jan)
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Fix for array handling, from Gerhard Hintermayer
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Fix acl error, and remove duplicate pqtrace(Bruce)
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Fix psql \e for empty file(Bruce)
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Fix for textcat on varchar() fields(Bruce)
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Fix for DBT Sendproc (Zeugswetter Andres)
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Fix vacuum analyze syntax problem(Bruce)
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Fix for international identifiers(Tatsuo)
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Fix aggregates on inherited tables(Bruce)
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Fix substr() for out-of-bounds data
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Fix for select 1=1 or 2=2, select 1=1 and 2=2, and select sum(2+2)(Bruce)
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Fix notty output to show status result. -q option still turns it off(Bruce)
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Fix for count(*), aggs with views and multiple tables and sum(3)(Bruce)
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Fix cluster(Bruce)
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Fix for PQtrace start/stop several times(Bruce)
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Fix a variety of locking problems like newer lock waiters getting
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lock before older waiters, and having readlock people not share
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locks if a writer is waiting for a lock, and waiting writers not
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getting priority over waiting readers(Bruce)
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Fix crashes in psql when executing queries from external files(James)
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Fix problem with multiple order by columns, with the first one having
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NULL values(Jeroen)
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Use correct hash table support functions for float8 and int4(Thomas)
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Re-enable JOIN= option in CREATE OPERATOR statement (Thomas)
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Change precedence for boolean operators to match expected behavior(Thomas)
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Generate elog(ERROR) on over-large integer(Bruce)
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Allow multiple-argument functions in constraint clauses(Thomas)
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Check boolean input literals for 'true','false','yes','no','1','0'
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and throw elog(ERROR) if unrecognized(Thomas)
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Major large objects fix
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Fix for GROUP BY showing duplicates(Vadim)
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Fix for index scans in MergeJion(Vadim)
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Enhancements
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------------
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Subselects with EXISTS, IN, ALL, ANY keywords (Vadim, Bruce, Thomas)
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New User Manual(Thomas, others)
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Speedup by inlining some frequently-called functions
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Real deadlock detection, no more timeouts(Bruce)
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Add SQL92 "constants" CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP,
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CURRENT_USER(Thomas)
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Modify constraint syntax to be SQL92-compliant(Thomas)
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Implement SQL92 PRIMARY KEY and UNIQUE clauses using indices(Thomas)
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Recognize SQL92 syntax for FOREIGN KEY. Throw elog notice(Thomas)
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Allow NOT NULL UNIQUE constraint clause (each allowed separately before)(Thomas)
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Allow Postgres-style casting ("::") of non-constants(Thomas)
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Add support for SQL3 TRUE and FALSE boolean constants(Thomas)
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Support SQL92 syntax for IS TRUE/IS FALSE/IS NOT TRUE/IS NOT FALSE(Thomas)
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Allow shorter strings for boolean literals (e.g. "t", "tr", "tru")(Thomas)
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Allow SQL92 delimited identifiers(Thomas)
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Implement SQL92 binary and hexadecimal string decoding (b'10' and x'1F')(Thomas)
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Support SQL92 syntax for type coercion of literal strings
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(e.g. "DATETIME 'now'")(Thomas)
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Add conversions for int2, int4, and OID types to and from text(Thomas)
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Use shared lock when building indices(Vadim)
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Free memory allocated for an user query inside transaction block after
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this query is done, was turned off in <= 6.2.1(Vadim)
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New SQL statement CREATE PROCEDURAL LANGUAGE(Jan)
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New PostgreSQL Procedural Language (PL) backend interface(Jan)
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Rename pg_dump -H option to -h(Bruce)
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Add Java support for passwords, European dates(Peter)
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Use indices for LIKE and ~, !~ operations(Bruce)
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Add hash functions for datetime and timespan(Thomas)
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Time Travel removed(Vadim, Bruce)
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Add paging for \d and \z, and fix \i(Bruce)
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Add Unix domain socket support to backend and to frontend library(Goran)
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Implement CREATE DATABASE/WITH LOCATION and initlocation utility(Thomas)
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Allow more SQL92 and/or Postgres reserved words as column identifiers(Thomas)
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Augment support for SQL92 SET TIME ZONE...(Thomas)
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SET/SHOW/RESET TIME ZONE uses TZ backend environment variable(Thomas)
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Implement SET keyword = DEFAULT and SET TIME ZONE DEFAULT(Thomas)
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Enable SET TIME ZONE using TZ environment variable(Thomas)
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Add PGDATESTYLE environment variable to frontend and backend initialization(Thomas)
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Add PGTZ, PGCOSTHEAP, PGCOSTINDEX, PGRPLANS, PGGEQO
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frontend library initialization environment variables(Thomas)
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Regression tests time zone automatically set with "setenv PGTZ PST8PDT"(Thomas)
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Add pg_description table for info on tables, columns, operators, types, and
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aggregates(Bruce)
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Increase 16 char limit on system table/index names to 32 characters(Bruce)
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Rename system indices(Bruce)
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Add 'GERMAN' option to SET DATESTYLE(Thomas)
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Define an "ISO-style" timespan output format with "hh:mm:ss" fields(Thomas)
|
|
Allow fractional values for delta times (e.g. '2.5 days')(Thomas)
|
|
Validate numeric input more carefully for delta times(Thomas)
|
|
Implement day of year as possible input to date_part()(Thomas)
|
|
Define timespan_finite() and text_timespan() functions(Thomas)
|
|
Remove archive stuff(Bruce)
|
|
Allow for a pg_password authentication database that is separate from
|
|
the system password file(Todd)
|
|
Dump ACLs, GRANT, REVOKE permissions(Matt)
|
|
Define text, varchar, and bpchar string length functions(Thomas)
|
|
Fix Query handling for inheritance, and cost computations(Bruce)
|
|
Implement CREATE TABLE/AS SELECT (alternative to SELECT/INTO)(Thomas)
|
|
Allow NOT, IS NULL, IS NOT NULL in constraints(Thomas)
|
|
Implement UNIONs for SELECT(Bruce)
|
|
Add UNION, GROUP, DISTINCT to INSERT(Bruce)
|
|
varchar() stores only necessary bytes on disk(Bruce)
|
|
Fix for BLOBs(Peter)
|
|
Mega-Patch for JDBC...see README_6.3 for list of changes(Peter)
|
|
Remove unused "option" from PQconnectdb()
|
|
New LOCK command and lock manual page describing deadlocks(Bruce)
|
|
Add new psql \da, \dd, \df, \do, \dS, and \dT commands(Bruce)
|
|
Enhance psql \z to show sequences(Bruce)
|
|
Show NOT NULL and DEFAULT in psql \d table(Bruce)
|
|
New psql .psqlrc file startup(Andrew)
|
|
Modify sample startup script in contrib/linux to show syslog(Thomas)
|
|
New types for IP and MAC addresses in contrib/ip_and_mac(TomH)
|
|
Unix system time conversions with date/time types in contrib/unixdate(Thomas)
|
|
Update of contrib stuff(Massimo)
|
|
Add Unix socket support to DBD::Pg(Goran)
|
|
New python interface (PyGreSQL 2.0)(D'Arcy)
|
|
New frontend/backend protocol has a version number, network byte order(Phil)
|
|
Security features in pg_hba.conf enhanced and documented, many cleanups(Phil)
|
|
CHAR() now faster access than VARCHAR() or TEXT
|
|
ecpg embedded SQL preprocessor
|
|
Reduce system column overhead(Vadmin)
|
|
Remove pg_time table(Vadim)
|
|
Add pg_type attribute to identify types that need length (bpchar, varchar)
|
|
Add report of offending line when COPY command fails
|
|
Allow VIEW permissions to be set separately from the underlying tables.
|
|
For security, use GRANT/REVOKE on views as appropriate(Jan)
|
|
Tables now have no default GRANT SELECT TO PUBLIC. You must
|
|
explicitly grant such permissions.
|
|
Clean up tutorial examples(Darren)
|
|
|
|
Source Tree Changes
|
|
-------------------
|
|
Add new html development tools, and flow chart in /tools/backend
|
|
Fix for SCO compiles
|
|
Stratus computer port "Gillies, Robert" <GilliesR@Nichols.com>
|
|
Added support for shlib for BSD44_derived & i386_solaris
|
|
Make configure more automated(Brook)
|
|
Add script to check regression test results
|
|
Break parser functions into smaller files, group together(Bruce)
|
|
Rename heap_create to heap_create_and_catalog, rename heap_creatr
|
|
to heap_create()(Bruce)
|
|
Sparc/Linux patch for locking(TomS)
|
|
Remove PORTNAME and reorganize port-specific stuff(Marc)
|
|
Add optimizer README file(Bruce)
|
|
Remove some recursion in optimizer and clean up some code there(Bruce)
|
|
Fix for NetBSD locking(Henry)
|
|
Fix for libptcl make(Tatsuo)
|
|
AIX patch(Darren)
|
|
Change IS TRUE, IS FALSE, ... to expressions using "=" rather than
|
|
function calls to istrue() or isfalse() to allow optimization(Thomas)
|
|
Various fixes NetBSD/Sparc related(TomH)
|
|
Alpha linux locking(Travis,Ryan)
|
|
Change elog(WARN) to elog(ERROR)(Bruce)
|
|
FAQ for FreeBSD(Marc)
|
|
Bring in the PostODBC source tree as part of our standard distribution(Marc)
|
|
A minor patch for HP/UX 10 vs 9(Stan)
|
|
New pg_attribute.atttypmod for type-specific info like varchar length(Bruce)
|
|
Unixware patches(Billy)
|
|
New i386 'lock' for spin lock asm(Billy)
|
|
Support for multiplexed backends is removed
|
|
Start an OpenBSD port
|
|
Start an AUX port
|
|
Start a Cygnus port
|
|
Add string functions to regression suite(Thomas)
|
|
Expand a few function names formerly truncated to 16 characters(Thomas)
|
|
Remove un-needed malloc() calls and replace with palloc()(Bruce)
|