263 lines
11 KiB
Plaintext
263 lines
11 KiB
Plaintext
====================================================
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TODO list (FAQ) for PostgreSQL
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====================================================
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last updated: Mon Sep 29 22:45:43 EDT 1997
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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 6.2 APPEAR AT THE END OF THIS DOCUMENT
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Developers who have claimed items are:
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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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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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Igor is Igor <igor@sba.miami.edu>
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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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Martin is Martin S. Utesch <utesch@aut.tu-freiberg.de>
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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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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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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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RELIABILITY
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-----------
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-Overhaul mdmgr/smgr to fix double unlinking and double opens, cleanup(Erich)
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-Overhaul bufmgr/lockmgr/transaction manager(Vadim)
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Fix CLUSTER
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Remove EXTEND?
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Fix all NULL features
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allow psql to print nulls meaningfully
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Fix compile and security of Kerberos/GSSAPI code (Daniel Kalchev?)
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COUNT on VIEW always returns zero (maybe because there is no oid for views?)
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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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Add GROUP BY and HAVING to INSERT INTO table SELECT * FROM table2
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lo_unlink() crashes server
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Allow variable casts with BETWEEN 'today'::asbtime AND 'today'::abstime
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Prevent auto-table reference, like SELECT table.col WHERE col = 3 (?)
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Remove un-needed malloc() calls and replace with palloc().
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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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SELECT COUNT(*) FROM TAB1, TAB2 fails
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SELECT SUM(2+2) FROM table dumps core
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UPDATE table SET table.value = 3 fails
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UPDATE key_table SET keyval=max(reftab.NUM)+1 WHERE tblname='reftab' fails
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INSERT INTO ... SELECT DISTINCT ... generates error on DISTINCT
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INSERT INTO table SELECT id, count(*) FROM table2 GROUP BY id generate error
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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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PRIMARY KEY during table creation
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Add SERIAL type
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Preserve GRANT/REVOKE/pg_group in pg_dump
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Transaction log
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Add full ANSI SQL capabilities (Stefan)
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add subselects, possibility using temporary SQL functions
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Implement HAVING clause
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Implement EXISTS qualifier
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report "Not implemented" if valid syntax is supplied
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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 UNIONS, INTERSECTS, SUBTRACTS
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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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allow conversion type casts on SELECT target fields
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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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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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overwriting blocks has problems
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there are other problems, too.
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Fix large object mapping scheme
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not to stuff everything as files in a single directory
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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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Add support for tables >2G, or test current version
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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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Add other language types for built-in functions
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expand to allow tcl, perl, java,
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generalize the function manager switch to pass
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function sources to interpreter engines.
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remove time-travel feature(Vadim)
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reduce system column overhead(Vadmin)
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remove pg_time table(Vadim)
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allow row re-use without vacuum, maybe?(Vadim)
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can't vacuum large objects
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can't reduce index file size with vacuum
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Remove restriction that ORDER BY field must be in SELECT list(?)
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Allow queries about owner of tables, like:
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SELECT u.usesysid FROM postgres.pg_user u;
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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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Allow readline-type or editor command editing of multi-line SQL commands
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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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Remove stale files upon startup(Vivek)
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Add command to show privileges
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Allow INSERT INTO ... SELECT to convert column types
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Add syslog functionality
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Add STDDEV/VARIANCE() function for standard deviation computation/variance
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Add table/column/function discription table indexed by oid
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add pg_type attribute to identify types that need length (bpchar, varchar)
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add UNIQUE capability to non-btree indexes
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make large objects have their own reltype
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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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allow unix domain sockets for local connections for performance and security
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Add PAGER for psql's \dt and \d tablename
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PERFORMANCE
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-----------
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Use indexes in ORDER BY
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Allow LIKE/wildcard matches to use indexes if the wildcard character is not first
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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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Is fsync use optimized?
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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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DOCUMENTATION
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-------------
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Update usermanual source(many)
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remove time-travel in documentation(Bruce)
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added features used in grammer but not in docs, like :: and CAST
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update libpq++ manual page
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PORTABILITY
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-----------
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---------------------------------------------------------------------------
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CHANGES IN THE 6.2 RELEASE
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Bug Fixes
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---------
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Fix problems with pg_dump for inheritance, sequences, archive tables(Bruce)
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Fix compile errors on overflow due to shifts, unsigned, and bad prototypes
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from Solaris(Diab Jerius)
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Fix bugs in geometric line arithmetic (bad intersection calculations)(Thomas)
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Check for geometric intersections at endpoints to avoid rounding ugliness(Thomas)
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Catch non-functional delete attempts(Vadim)
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Change time function names to be more consistent(Michael Reifenberg)
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Check for zero divides(Michael Reifenberg)
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Fix very old bug which made tuples changed/inserted by a commnd
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visible to the command itself (so we had multiple update of
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updated tuples, etc)(Vadim)
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Fix for SELECT null, 'fail' FROM pg_am (Patrick)
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SELECT NULL as EMPTY_FIELD now allowed(Patrick)
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Remove un-needed signal stuff from contrib/pginterface
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Enhancements
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------------
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Default genetic optimizer GEQO parameter is now 8(Bruce)
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Allow use parameters in target list having aggregates in functions(Vadim)
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Added JDBC driver as an interface(Adrian & Peter)
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pg_password utility
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Return number of tuples inserted/affected by INSERT/UPDATE/DELETE etc.(Vadim)
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Triggers implemented with CREATE TRIGGER (SQL3)(Vadim)
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SPI (Server Programming Interface) implemented to support triggers(Vadim)
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NOT NULL implemented (SQL92)(Robson Paniago de Miranda)
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Include reserved words for string handling, outer joins, and unions(Thomas)
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Implement extended comments ("/* ... */") using exclusive states(Thomas)
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Add "//" single-line comments(Bruce)
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Remove some restrictions on characters in operator names(Thomas)
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DEFAULT and CONSTRAINT for tables implemented (SQL92)(Vadim & Thomas)
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Add text concatenation operator and function (SQL92)(Thomas)
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Support WITH TIME ZONE syntax (SQL92)(Thomas)
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Support INTERVAL <unit> TO <unit> syntax (SQL92)(Thomas)
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Define types DOUBLE PRECISION, INTERVAL, CHARACTER,
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and CHARACTER VARYING (SQL92)(Thomas)
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Define type FLOAT(p) and rudimentary DECIMAL(p,s), NUMERIC(p,s) (SQL92)(Thomas)
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Define EXTRACT(), POSITION(), SUBSTRING(), and TRIM() (SQL92)(Thomas)
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Define CURRENT_DATE, CURRENT_TIME, CURRENT_TIMESTAMP (SQL92)(Thomas)
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Add syntax and warnings for UNION, HAVING, INNER and OUTER JOIN (SQL92)(Thomas)
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Add more reserved words, mostly for SQL92 compliance(Thomas)
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Allow hh:mm:ss time entry for timespan/reltime types(Thomas)
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Add center() routines for lseg, path, polygon(Thomas)
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Add distance() routines for circle-polygon, polygon-polygon(Thomas)
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Check explicitly for points and polygons contained within polygons
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using an axis-crossing algorithm(Thomas)
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Add routine to convert circle-box(Thomas)
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Merge conflicting operators for different geometric data types(Thomas)
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Replace distance operator "<===>" with "<->"(Thomas)
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Replace "above" operator "!^" with ">^" and "below" operator "!|" with "<^"(Thomas)
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Add routines for text trimming on both ends, substring, and string position(Thomas)
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Added conversion routines circle(box) and poly(circle)(Thomas)
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Allow internal sorts to be stored in memory rather than in files(Bruce & Vadim)
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Allow functions and operators on internally-identical types to succeed(Bruce)
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Speed up backend startup after profiling analysis(Bruce)
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Inline frequently called functions for performance(Bruce)
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Reduce open() calls(Bruce)
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psql: Add PAGER for \h and \?,\C fix
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Fix for psql pager when no tty(Bruce)
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New entab utility(Bruce)
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Source Tree Changes
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-------------------
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HPUX 10 patches (Vladimir Turin)
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Added SCO support, (Daniel Harris)
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mkLinux patches (Tatsuo Ishii)
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Change geometric box terminology from "length" to "width"(Thomas)
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Deprecate temporary unstored slope fields in geometric code(Thomas)
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Remove restart instructions from INSTALL(Bruce)
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Look in /usr/ucb first for install(Bruce)
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Fix c++ copy example code(Thomas)
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Add -o to psql manual page(Bruce)
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Prevent relname unallocated string length from being copied into database(Bruce)
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Cleanup for NAMEDATALEN use(Bruce)
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Fix pg_proc names over 15 chars in output(Bruce)
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Add strNcpy() function(Bruce)
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remove some (void) casts that are unnecessary(Bruce)
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new interfaces directory(Marc)
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Replace fopen() calls with calls to fd.c functions(Bruce)
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Make functions static where possible(Bruce)
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enclose unused functions in #ifdef NOT_USED(Bruce)
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Remove call to difftime() in timestamp support to fix SunOS(Bruce & Thomas)
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Changes for Digital Unix
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Portability fix for pg_dumpall(Bruce)
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Rename pg_attribute.attnvals to attdisbursion(Bruce)
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"intro/unix" manual page now "pgintro"(Bruce)
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"built-in" manual page now "pgbuiltin"(Bruce)
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"drop" manual page now "drop_table"(Bruce)
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Add "create_trigger", "drop_trigger" manual pages(Thomas)
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Add constraints regression test(Vadim & Thomas)
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Add comments syntax regression test(Thomas)
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Add PGINDENT and support program(Bruce)
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Massive commit to run PGINDENT on all *.c and *.h files(Bruce)
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Files moved to /src/tools directory(Bruce)
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