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342 lines
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342 lines
14 KiB
Plaintext
TODO list for PostgreSQL
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========================
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Last updated: Thu Mar 23 01:35:33 EST 2000
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Current maintainer: Bruce Momjian (pgman@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 web site, http://www.PostgreSQL.org.
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A dash(-) marks changes that will appear in the upcoming 7.0 release.
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Names in brackets "[]" indicate more detailed information is available in
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the directory pgsql/doc/TODO.detail/ under that name.
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RELIABILITY
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-----------
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RESOURCES
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* -Disallow inherited columns with the same name as new columns
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* -Elog() does not free all its memory
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* -spinlock stuck problem when elog(FATAL) and elog(ERROR) inside bufmgr
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* -Recover or force failure when disk space is exhausted(Hiroshi)
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PARSER
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* -INSERT INTO ... SELECT with AS columns matching result columns problem
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* SELECT pg_class FROM pg_class generates strange error
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* Alter TABLE ADD COLUMN does not honor DEFAULT, add CONSTRAINT
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* -Select a[1] FROM test fails, it needs test.a[1](Tom)
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* -Array index references without table name cause problems [array](Tom)
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* Creating index of TIMESTAMP & RELTIME fails, or rename to DATETIME(Thomas)
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* SELECT foo UNION SELECT foo is incorrectly simplified to SELECT foo
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* -INSERT ... SELECT ... GROUP BY groups by target columns not source columns(Tom)
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* -CREATE TABLE test (a char(5) DEFAULT text '', b int4) fails on INSERT(Tom)
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* -UNION with LIMIT fails
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* Unique index on base column not honored on inserts from inherited table
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INSERT INTO inherit_table (unique_index_col) VALUES (dup) should fail
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[inherit]
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* -CREATE TABLE x AS SELECT 1 UNION SELECT 2 fails
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* -CREATE TABLE test(col char(2) DEFAULT user) fails in length restriction
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* -mismatched types in CREATE TABLE ... DEFAULT causes problems [default]
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* -SELECT ... UNION ... ORDER BY fails when sort expr not in result
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list, ORDER BY is applied only to the first SELECT
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* Be smarter about promoting types when UNION merges different data types
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* redesign INSERT ... SELECT to have two levels of target list
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* -select * from pg_class where oid in (0,-1)
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* have INTERSECT/EXCEPT prevent duplicates unless ALL is specified
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* -prevent primary key that exceeds max index columns [primary]
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* -SELECT COUNT('asdf') FROM pg_class WHERE oid=12 crashes
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* SELECT DISTINCT ON col1 col1 col2 FROM tab1 is broken [distinct]
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* -require SELECT DISTINCT target list to have all ORDER BY columns
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* -When using aggregates + GROUP BY, no rows in should yield no rows out(Tom)
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* -Allow HAVING to use comparisons that have no aggregates(Tom)
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* -Allow COUNT(DISTINCT col))(TOm)
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* SELECT 'x'::varchar(10) INTO newtable; fails
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* SELECT col::DECIMAL(12,10); fails
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VIEWS
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* Views containing aggregates sometimes fail(Jan)
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* -Views with spaces in view name fail when referenced
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* Creating view and inheriting the view causes view* to show
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duplicates(inherit)
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* Disallow LOCK on view
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MISC
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* -User who can create databases can modify pg_database table(Peter E)
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* Plpgsql does not handle quoted mixed-case identifiers
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* -Fix btree to give a useful elog when key > 1/2 (page - overhead)(Tom)
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* -pg_dump should preserve primary key information(Peter E)
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* -plpgsql regression tests fails on BSD/OS
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* -database names with spaces fail
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* -insert of 0.0 into DECIMAL(4,4) field fails(Tom)
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* -* Interlock to prevent DROP DATABASE on a database with running backendsInterlock to prevent DROP DATABASE on a database with running backends
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* Buffer reference counting bugfixes
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* Fix libpq bug that causes it to drop backend error message sent
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just before connection closure (ie, any FATAL error message)
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* SELECT ... UNION ... ORDER BY fails when sort expr not in result list
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* SELECT ... UNION ... GROUP BY fails if column types disagree, no type
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promotion occurs
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* Modification of pg_class can happen while table in use by
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another backend. Might lead to MVCC inside of syscache
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* Permission to UPDATE table allows DELETE also
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ENHANCEMENTS
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------------
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URGENT
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* -Add referential integrity(Jan)[primary]
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* Add MATCH PARTIAL referential integrity
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* Foreign key does not check that columns referenced form a primary key
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or constrained by UNIQUE
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* Add OUTER joins, left and right[outer](Thomas, Bruce)
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* Allow long tuples by chaining or auto-storing outside db (TOAST)(Jan)
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* -Eliminate limits on query length
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* Fix memory leak for expressions[memory](Tom?)
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* -Fix memory leak for aggregates(Tom)
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ADMIN
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* -Better interface for adding to pg_group(Peter E)
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* More access control over who can create tables and access the database
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* Test syslog functionality
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* Allow elog() to return error codes, not just messages
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* Allow international error message support and add error codes
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* -Generate postmaster pid file and remove flock/fcntl lock code[flock](Tatsuo)
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* Add ability to specifiy location of lock/socket files [flock]
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* Unify configuration into one configuration file
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TYPES
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* -Add BIT, BIT VARYING
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* Nchar (as distinguished from ordinary varchar),
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* Domain capability
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* Add STDDEV/VARIANCE() function for standard deviation computation/variance
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* Allow compression of large fields or a compressed field type
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* Large objects
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o Fix large object mapping scheme, own typeid or reltype(Peter)
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o Not to stuff everything as files in a single directory, hash dirs
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o Allow large object vacuuming
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o Tables that start with xinv confused to be large objects
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* -Allow pg_descriptions when creating tables
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* -Allow pg_descriptions when creating types, columns, and functions
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* Add IPv6 capability to INET/CIDR types
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* Make a separate SERIAL type?
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* Store binary-compatible type information in the system
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* Add support for & operator
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* Allow LOCALE on a per-column basis, default to ASCII
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* -Allow LOCALE to use indexes in regular expression searches(Tom)
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* -Allow array on int8[](Thomas)
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* Allow nulls in arrays
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* Allow arrays to be ORDER'ed
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* Remove Money type, add money formatting for decimal type
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* Declare typein/out functions in pg_proc with a special "C string" data type
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* Add non-large-object binary field
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* -Add index on NUMERIC/DECIMAL type(Jan)
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* -Make Absolutetime/Relativetime int4 because time_t can be int8 on some ports
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(Peter E)
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* Functions returning sets don't really work right[function]
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* Make type equivalency apply to aggregates(Peter E.)
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VIEWS
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* Allow DISTINCT on views
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* Allow views of aggregate columns
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* Allow views with subselects
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INDEXES
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* Allow CREATE INDEX zman_index ON test (date_trunc( 'day', zman ) datetime_ops)
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fails index can't store constant parameters
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* -Allow creation of functional indexes to use default types
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* -Permissions on indexes, prevent them(Peter E)
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* Allow SQL function indexes
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* Add FILLFACTOR to index creation
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* -Allow indexing of LIKE with localle character sets
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* -Allow indexing of more than eight columns
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COMMANDS
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* ALTER TABLE ADD COLUMN to inherited table put column in wrong place [inherit]
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* -Add ALTER TABLE DROP/ALTER COLUMN feature(Peter E)
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* Allow CLUSTER on all tables at once, and improve CLUSTER, loses NOT
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NULL specification, indexes, permissions, etc on table[cluster]
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* Add SIMILAR TO to allow character classes, 'pg_[a-c]%'
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* Auto-destroy sequence on DROP of table with SERIAL(Ryan)
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* Allow LOCK TABLE tab1, tab2, tab3 so all tables locked in unison
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* Allow INSERT/UPDATE of system-generated oid value for a row
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* Allow ESCAPE '\' at the end of LIKE for ANSI compliance [like]
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* Rewrite the LIKE handling by rewriting the user string with the
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supplied ESCAPE [like]
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* -Move LIKE index optimization handling to the optimizer(Tom)
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* Allow RULE recompilation
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* Support UNION/INTERSECT/EXCEPT in sub-selects
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* Allow DELETE and UPDATE to use inheritance using tablename*
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* Allow INSERT INTO my_table VALUES (a, b, c, DEFAULT, x, y, z, ...)
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CLIENTS
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* Make NULL's come out at the beginning or end depending on the
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ORDER BY direction
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* -Allow flag to control COPY input/output of NULLs(Peter E)
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* Update reltuples from COPY command
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* -Allow psql \copy to allow delimiters(Peter E)
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* -Add a function to return the last inserted oid, for use in psql
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scripts (Peter E)
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* -Allow psql to print nulls as distinct from "" [null](Peter E)
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* fix array handling for ECPG
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* add pg_dump option to dump type names as standard ANSI types
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EXOTIC FEATURES
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* Add sql3 recursive unions
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* Add the concept of dataspaces
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* Add replication of distributed databases
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* Allow queries across multiple databases
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* Allow nested transactions
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MISC
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* Increase identifier length(NAMEDATALEN) if small performance hit
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* Allow row re-use without vacuum(Vadim)
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* Create a background process for each database that runs while
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database is idle, finding superceeded rows, gathering stats and vacuuming
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* Add UNIQUE capability to non-btree indexes
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* Certain indexes will not shrink, i.e. oid indexes with many inserts(Vadim)
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* Restore unused oid's on backend exit if no one else has gotten oids
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* Have UPDATE/DELETE clean out indexes
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* -Allow WHERE restriction on ctid(Hiroshi)
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* Allow cursors to be DECLAREd/OPENed/CLOSEed outside transactions
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* Allow DELETE WHERE CURRENT OF cursor
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* -Allow PQrequestCancel() to terminate when in waiting-for-lock state
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* Transaction log, so re-do log can be on a separate disk by
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with after-row images(Vadim) [logging](Vadim)(in-progress)
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* Populate backend status area and write program to dump status data
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* Make oid use unsigned int more reliably, pg_atoi()
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* -Allow subqueries in target list(Tom)
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* Put sort files, large objects in their own directory
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* Do autocommit so always in a transaction block(?)
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* Show location of syntax error in query [yacc]
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* Redesign the function call interface to handle NULLs better[function](Tom)
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* -Document/trigger/rule so changes to pg_shadow recreate pg_pwd
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[pg_shadow](Peter E.)
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* Missing optimizer selectivities for date, r-tree, etc. [optimizer]
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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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* -Add PL/Perl(Mark Hollomon)
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* -Add option for postgres user have a password by default(Peter E)
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* Add configure test to check for C++ need for *.h and namespaces
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* Allow BLCKSZ <= 64k, not <= 32k
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* redesign UNION structures to have separarate target lists
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* Allow multi-level query trees for INSERT INTO ... SELECT
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PERFORMANCE
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-----------
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FSYNC
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* Allow transaction commits with rollback with no-fsync performance [fsync](Vadim)
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* -Prevent fsync in SELECT-only queries(Vadim)
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INDEXES
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* Use indexes in ORDER BY for min(), max()
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* Use index to restrict rows returned by multi-key index when used with
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non-consecutive keys or OR clauses, so fewer heap accesses
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* -Convert function(constant) into a constant for index use(Bernard Frankpitt)
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* Improve LIMIT processing by using index to limit rows processed [limit]
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* Have optimizer take LIMIT into account when considering index scans [limit]
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* -Make index creation use psort code, because it is now faster(Tom)
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* -Allow creation of sort temp tables > 1 Gig
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* -Create more system table indexes for faster cache lookups
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* -fix indexscan() so it does leak memory by not requiring caller to
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free(Tom)
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* -Improve _bt_binsrch() to handle equal keys better, remove _bt_firsteq()(Tom)
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* Allow SELECT * FROM tab WHERE int2col = 4 use int2col index, int8,
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float4, numeric/decimal too [optimizer]
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* -Allow optimizer to prefer plans that match ORDER BY(Tom)
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* Include heap CTID in btree index keys, remove equal-key cruft from btree
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CACHE
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* Cache most recent query plan(s) [prepare]
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* Shared catalog cache, reduce lseek()'s by caching table size in shared area
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* -elog() flushes cache, try invalidating just entries from current xact,
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perhaps using invalidation cache
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MISC
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* Allow compression of log and meta data
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* Allow char() not to use variable-sized header to reduce disk size
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* Allow char1 data type that takes one byte of storage
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* Do async I/O to do better read-ahead of data
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* -Fix memory exhaustion when using many OR's [cnfify](Tom)
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* Get faster regex() code from Henry Spencer <henry@zoo.utoronto.ca>
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when it is available
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* Use mmap() rather than SYSV shared memory(?)
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* -Process const = const parts of OR clause in separate pass(Bernard Frankpitt)
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* Make oid use oidin/oidout not int4in/int4out in pg_type.h
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* Improve Subplan list handling
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* Allow Subplans to use efficient joins(hash, merge) with upper variable
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[subquery]
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* use fmgr_info()/fmgr_faddr() instead of fmgr() calls in high-traffic
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places, like GROUP BY, UNIQUE, index processing, etc.
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* improve dynamic memory allocation by introducing tuple-context memory
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allocation [memory]
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* -fix memory leak in cache code when non-existant table is referenced
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* In WHERE tab1.x=3 AND tab1.x=tab2.y, add tab2.y=3
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* -pass atttypmod through parser in more cases [atttypmod]
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* -remove duplicate type in/out functions for disk and net
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* Allow persistent backends [persistent]
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* others [performance]
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* prevent labels from being output for stored rules (Tom)
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* allow configuration of maximum number of open files
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SOURCE CODE
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-----------
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* Add use of 'const' for variables in source tree
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* Fix C optimizer problem where fmgr_ptr calls return different types [alpha]
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* -Add needed includes and removed unneeded include files(Bruce)
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* -Make configure --enable-debug add -g on compile line(Peter E)
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* Does Mariposa source contain any other bug fixes?
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* Remove SET KSQO option if OR processing is improved(Tom)
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* -Pre-generate lex and yacc output so not required for install(Peter E)
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---------------------------------------------------------------------------
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Developers who have claimed items are:
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--------------------------------------
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* Billy is Billy G. Allie <Bill.Allie@mug.org>
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* Brook is Brook Milligan <brook@trillium.NMSU.Edu>
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* Bruce is Bruce Momjian<pgman@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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* David is David Hartwig <daveh@insightdist.com>
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* Edmund is Edmund Mergl <E.Mergl@bawue.de>
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* Goran is Goran Thyni <goran@kyla.kiruna.se>
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* Hiroshi is Hiroshi Inoue<Inoue@tpf.co.jp>
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* Jan is Jan Wieck <wieck@sapserv.debis.de>
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* Marc is Marc Fournier <scrappy@hub.org>
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* Massimo Dal Zotto <dz@cs.unitn.it>
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* Michael is Michael Meskes <meskes@postgresql.org>
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* Oleg is Oleg Bartunov <oleg@sai.msu.su>
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* Peter is Peter T Mount <peter@retep.org.uk>
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* Peter E is Peter Eisentraut<peter_e@gmx.net>
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* Ryan is Ryan Bradetich <rbrad@hpb50023.boi.hp.com>
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* Stefan Simkovics <ssimkovi@rainbow.studorg.tuwien.ac.at>
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* Tatsuo is Tatsuo Ishii <t-ishii@sra.co.jp>
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* Tom is Tom Lane <tgl@sss.pgh.pa.us>
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* Thomas is Thomas Lockhart <lockhart@alumni.caltech.edu>
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* TomH is Tom I Helbekkmo <tih@Hamartun.Priv.NO>
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* Vadim is "Vadim B. Mikheev" <vadim@krs.ru>
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