272 lines
11 KiB
Plaintext
272 lines
11 KiB
Plaintext
====================================================
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TODO list (FAQ) for PostgreSQL
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====================================================
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last updated: Wed Jan 29 00:16:44 EST 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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Changes included in the 6.0 release are listed at the end of this page.
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Dashed items(-) are being worked on for the post-6.0 release.
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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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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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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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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 V code
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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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fix system to use oid index using constant without cast to oid
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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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ENHANCEMENTS
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------------
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Add full ANSI SQL capabilities
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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?)
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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, upper/lower(), 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
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allow optimizer to effectively use parameters without accessing table
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Add int8 type
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Add MONEY/DECIMAL type with defined precision
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Add table comments
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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
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can't vacuum large objects
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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
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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
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Allow function result to be used in GROUP BY
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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 upper/lower functions
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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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improve auto-type casting
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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
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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
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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
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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 pages
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PORTABILITY
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-----------
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Windows NT port
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Mariposa project at Berkeley has a person who's working on this
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Win95 port, use GNU port or remove it?
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Merge i386_solaris and sparc_solaris into solaris
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Switch from PORTNAME to individual feature defines (use configure/autoconf?)
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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 6.0 RELEASE
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Bug Fixes
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---------
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ALTER TABLE bug - running postgress process needs to re-read table definition
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Allow vacuum to be run on one table or entire database(Bruce)
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Array fixes
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Fix array over-runs of memory writes(Kurt)
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Fix elusive btree range/non-range bug(Dan)
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Fix for hash indexes on some types like time and date
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Fix for pg_log size explosion
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Fix permissions on lo_export()(Bruce)
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Fix unitialized reads of memory(Kurt)
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Fixed ALTER TABLE ... char(3) bug(Bruce)
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Fixed a few small memory leaks
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Fixed EXPLAIN handling of options and changed full_path option name
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Fixed output of group acl permissions
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Memory leaks (hunt and destroy with tools like Purify(Kurt)
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Minor improvements to rules system
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NOTIFY fixes
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New asserts for run-checking
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Overhauled parser/analyze code to properly report errors and increase speed
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Pg_dump -d now handles NULL's properly(Bruce)
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Prevent SELECT NULL from crashing server (Bruce)
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Properly report errors when INSERT ... SELECT columns did not match
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Properly report errors when insert column names were not correct
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Psql \g filename now works(Bruce)
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Psql fixed problem with multiple statements on one line with multiple outputs
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Removed duplicate system oid's
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SELECT * INTO TABLE . GROUP/ORDER BY gives unlink error if table exists(Bruce)
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Several fixes for queries that crashed the backend
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Starting quote in insert string errors(Bruce)
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Submiting an empty query now returns empty status, not just " " query(Bruce)
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Enhancements
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------------
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Add EXPLAIN manual page(Bruce)
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Add UNIQUE index capability(Dan)
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Add hostname/user level access control rather than just hostname and user
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Add synonym of != for <>(Bruce)
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Allow "select oid,* from table"
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Allow BY,ORDER BY to specify columns by number, or by non-alias table.column(Bruce)
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Allow COPY from the frontend(Bryan)
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Allow GROUP BY to use alias column name(Bruce)
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Allow actual compression, not just reuse on the same page(Vadim)
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Allow installation-configuration option to auto-add all local users(Bryan)
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Allow libpq to distinguish between text value '' and null(Bruce)
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Allow non-postgres users with createdb privs to destroydb's
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Allow restriction on who can create C functions(Bryan)
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Allow restriction on who can do backend COPY(Bryan)
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Can shrink tables, pg_time and pg_log(Vadim & Erich)
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Change debug level 2 to print queries only, changed debug heading layout(Bruce)
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Change default decimal constant representation from float4 to float8(Bruce)
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European date format now set when postmaster is started
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Execute lowercase function names if not found with exact case
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Fixes for aggregate/GROUP processing, allow 'select sum(func(x),sum(x+y) from z'
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Gist now included in the distrubution(Marc)
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Idend authentication of local users(Bryan)
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Implement BETWEEN qualifier(Bruce)
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Implement IN qualifier(Bruce)
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Libpq has PQgetisnull()(Bruce)
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Libpq++ improvements
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New options to initdb(Bryan)
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Pg_dump allow dump of oid's(Bruce)
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Pg_dump create indexes after tables are loaded for speed(Bruce)
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Pg_dumpall dumps all databases, and the user table
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Pginterface additions for NULL values(Bruce)
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Prevent postmaster from being run as root
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Psql \h and \? is now readable(Bruce)
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Psql allow backslashed, semicolons anywhere on the line(Bruce)
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Psql changed command prompt for lines in query or in quotes(Bruce)
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Psql char(3) now displays as (bp)char in \d output(Bruce)
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Psql return code now more accurate(Bryan?)
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Psql updated help syntax(Bruce)
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Re-visit and fix vacuum(Vadim)
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Reduce size of regression diffs, remove timezone name difference(Bruce)
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Remove compile-time parameters to enable binary distributions(Bryan)
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Reverse meaning of HBA masks(Bryan)
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Secure Authentication of local users(Bryan)
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Speed up vacuum(Vadim)
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Vacuum now had VERBOSE option(Bruce)
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Source tree changes
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-------------------
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All functions now have prototypes that are compared against the calls
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Allow asserts to be disabled easly from Makefile.global(Bruce)
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Change oid constants used in code to #define names
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Decoupled sparc and solaris defines(Kurt)
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Gcc -Wall compiles cleanly with warnings only from unfixable constructs
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Major include file reorganization/reduction(Marc)
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Make now stops on compile failure(Bryan)
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Makefile restructuring(Bryan, Marc)
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Merge bsdi_2_1 to bsdi(Bruce)
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Monitor program removed
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Name change from Postgres95 to PostgreSQL
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New config.h file(Marc, Bryan)
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PG_VERSION now set to 6.0 and used by postmaster
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Portability additions, including Ultrix, DG/UX, AIX, and Solaris
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Reduced the number of #define's, centeralized #define's
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Remove duplicate OIDS in system tables(Dan)
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Remove duplicate system catalog info or report mismatches(Dan)
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Removed many os-specific #define's
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Restructured object file generation/location(Bryan, Marc)
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Restructured port-specific file locations(Bryan, Marc)
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Unused/uninialized variables corrected
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