255 lines
10 KiB
Plaintext
255 lines
10 KiB
Plaintext
====================================================
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TODO list (FAQ) for PostgreSQL
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====================================================
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last updated: Wed May 14 17:51:33 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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Dashed items(-) are being worked on for the 6.1 release.
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THE CHANGES FOR 6.1 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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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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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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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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remove -S (stable memory) option or fix memory manager
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Fix CLUSTER
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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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Dropping a table twice causes corruption, drop/create not rollback-able
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-SUM aggregate on no rows or null value should return NULL, not zero(Thomas)
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SELECT on two tables where zero or one table in WHERE and target
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clause returns no rows
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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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SELECT a[1] FROM test fails, it needs test.a[1]
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INSERT INTO ... SELECT DISTINCT ... generates error on DISTINCT
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pg_database.datdba is oid, should be int4
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fix array diffs in regression test
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can lo_export()/lo_import() read/write anywhere, causing a security problem?
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SELECT ... INTO TABLE ... with varchar()/char() types have zero-length fields
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Fix UPDATE key_table SET keyval=max(reftab.NUM)+1 WHERE tblname='reftab'
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ENHANCEMENTS
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------------
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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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column constraints (using rules), PRIMARY KEY during table creation
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add DEFAULT, RESTRAINT, and CHECK capabilities
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report "Not implemented" if valid syntax is supplied
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add NOT NULL to CREATE statement
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add OUTER joins, left and right
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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 assertions
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add domains
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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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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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- upper/lower()
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word searches, concat,max() on text, char
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Replace table-level locking with row or page-level locking(Vadim)
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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 multi-field indexes easier to create(Vadim)
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allow optimizer to effectively use parameters without accessing table
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-Add int8 type(Thomas)
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-Add MONEY/DECIMAL type(Thomas)
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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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Incorporate the PERL PG95 interface library into source tree(Edmund)
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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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-split apart row removal function from statistics function(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 datbases, tables like:
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SELECT u.usesysid FROM postgres.pg_user u;
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DROP AGGREGATE should take in basetype as an arg(Darren)
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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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-Add common-sense constant type promotions(Bruce)
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Allow readline-type or editor command editing of multi-line SQL commands
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-Allow pg_dump to dump all databases at a site in one command(Bruce)
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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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Allow aggregate for all types, like count(Darren)
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Improve optimizer plan choice(Darren)
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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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-make all identifiers case-insensitive(Bruce)
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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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-allow GROUP BY on columns that on functions(Vadim)
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-add non-ascii collating strings with strcoll() and setlocale (Oleg)
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-new DATE routines (Thomas)
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-index NULL fields(Vadim)
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-Add SERIAL column type(Vadim)
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-Add multi-column indexes(Vadim)
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-Add SET VAR TO command
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PERFORMANCE
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-----------
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Optimizing disjunctive queries
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-Add Genetic Query Optimzation for many tables (Martin)
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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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Multi-representational types, a la Illustra. For example, have a
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text type that is stored in-tuple when less than 8K and in large
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objects, when greater than 8K.
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Use indexes in ORDER BY
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Profile engine in INSERT's and other operations
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-Speed up hash creation by using btree's fast sort/insert routines(done)
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Cache most recent query plan(s?)
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Allow compression of log and meta data
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Allow LIKE/wildcard matches to use indexes if the wildcard character is not first
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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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-Add column optimization statistics to vacuum(Bruce)
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-Change pg_attribute.attnvals name to attdispursion and change type float4
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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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add DECLARE manual page
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PORTABILITY
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-----------
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Change c.h "Index" and "bool" so they do not conflict with c++
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---------------------------------------------------------------------------
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CHANGES IN THE 6.1 RELEASE
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Bug Fixes
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---------
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packet length checking in library routines
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lock manager priority patch
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check for under/over flow of float8(Bruce)
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multi-table join fix(Vadim)
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SIGPIPE crash fix(Darren)
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large object fixes(Sven)
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allow btree indexes to handle NULLs(Vadim)
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timezone fixes(D'Arcy)
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select SUM(x) can return NULL on no rows(Thomas)
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internal optimizer, executor bug fixes(Vadim)
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fix problem where inner loop in < or <= has no rows(Vadim)
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prevent re-commuting join index clauses(Vadim)
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fix join clauses for multiple tables(Vadim)
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fix hash, hashjoin for arrays(Vadim)
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fix btree for abstime type(Vadim)
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large object fixes(Raymond)
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Enhancements
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------------
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attribute optimization statistics(Bruce)
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much faster new btree bulk load code(Paul)
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BTREE UNIQUE added to bulk load code(Vadim)
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new lock debug code(Massimo)
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massive changes to libpg++(Leo)
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new GEQO optimizer speeds table multi-table optimization(Martin)
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new WARN message for non-unique insert into unique key(Marc)
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update x=-3, no spaces, now valid(Bruce)
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remove case-sensitive identifier handling(Bruce,Thomas,Dan)
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debug backend now pretty-prints tree(Darren)
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new Oracle character functions(Edmund)
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new plaintext password functions(Dan)
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no such class or insufficient privilege changed to distinct messages(Dan)
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new ANSI timestamp function(Dan)
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new ANSI Time and Date types (Thomas)
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move large chunks of data in backend(Martin)
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multi-column btree indexes(Vadim)
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new SET var TO value command(Martin)
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update transaction status on reads(Dan)
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new locale settings for character types(Oleg)
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new SEQUENCE serial number generator(Vadim)
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GROUP BY function now possible(Vadim)
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re-organize regression test(Thomas,Marc)
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new optimizer operation weights(Vadim)
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new psql \z grant/permit option(Marc)
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new MONEY data type(D'Arcy,Thomas)
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tcp socket communication speed improved(Vadim)
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new VACUUM option for attribute statistics, and for certain columns (Vadim)
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many geometric type improvements(Thomas,Keith)
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additional regression tests(Thomas)
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new datestyle variable(Thomas,Vadim,Martin)
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more comparison operators for sorting types(Thomas)
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new conversion functions(Thomas)
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new more compact btree format(Vadim)
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allow pg_dumpall to preserve database ownership(Bruce)
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Source tree changes
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-------------------
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new configuration script(Marc)
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readline configuration option added(Marc)
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OS-specific configuration options removed(Marc)
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new OS-specific template files(Marc)
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no more need to edit Makefile.global(Marc)
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re-arrange include files(Marc)
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nextstep patches (Gregor Hoffleit)
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removed WIN32-specific code(Bruce)
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removed postmaster -e option, now only postgres -e option (Bruce)
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merge duplicate library code in front/backends(Martin)
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now works with eBones, international Kerberos(Jun)
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more shared library support
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c++ include file cleanup(Bruce)
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warn about buggy flex(Bruce)
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