Update TODO list.
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Bruce Momjian
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TODO list for PostgreSQL
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========================
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Last updated: Sat Apr 14 21:55:58 EDT 2001
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Last updated: Sun Apr 15 21:32:39 EDT 2001
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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 7.1 release.
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A dash (-) marks changes that will appear in the upcoming 7.2 release.
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Bracketed items "[]" have more detailed information at
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http://www.postgresql.org/docs/todo.html.
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@ -20,34 +20,13 @@ PARSER
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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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* -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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* 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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[inheritance]
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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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* -have INTERSECT/EXCEPT prevent duplicates unless ALL is specified (Tom)
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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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* -Creating view and inheriting the view causes view* to show
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duplicates [inheritance]
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* -Disallow LOCK on view (Mark Hollomon)
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MISC
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* Plpgsql does not handle quoted mixed-case identifiers
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* -Buffer reference counting bugfixes (Tom)
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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 DELETE table allows UPDATE also
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* SELECT cash_out(1) causes crash
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@ -56,9 +35,6 @@ ENHANCEMENTS
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URGENT
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* -Add OUTER joins, left and right (Tom, Thomas)
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* -Allow long tuples by chaining or auto-storing outside db (TOAST) (Jan)
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* -Fix memory leak for expressions (Tom)
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* Add replication of distributed databases [replication]
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o automatic fallover
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o load balancing
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@ -73,32 +49,19 @@ URGENT
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ADMIN
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* More access control over who can create tables and use locks (Karel)
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* -Test syslog functionality
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* Allow elog() to return error codes, module name, file name, line
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number, not just messages [elog]
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* Allow international error message support and add error codes [elog]
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* -Unify configuration into one configuration file (Peter E)
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* -use setproctitle() if it exists for 'ps' display of status
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* -Prevent initdb from running wrong version of postmaster/postgres (Peter E)
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* Remove unused files during database vacuum or postmaster startup
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TYPES
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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 E)
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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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* Add IPv6 capability to INET/CIDR types
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* -Fix improper masking of some inet/cidr types
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* Add conversion function from text to inet
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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 (Peter E)
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* Allow LOCALE on a per-column basis, default to ASCII
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* Add SHOW command to see locale
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* Allow nulls in arrays
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@ -110,15 +73,12 @@ TYPES
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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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* Functions returning sets do not totally work
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* -Add hash for int8 (Tom)
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* SELECT col FROM tab WHERE numeric_col = 10.1 fails
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* -Get BIT type working
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* Allow better handling of numeric constants, type conversion [typeconv]
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* Support multiple simultaneous character sets, per SQL92
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* Reject character sequences those are not valid in their charset
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* Make functions more multi-byte aware, i.e. trim()
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* Make n of CHAR(n)/VARCHAR(n) the number of letters, not bytes
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* -Update macaddr manufacturer numbers, or remove the function macaddr_manuf()
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* Add btree index support for reltime, tinterval, regproc
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* Add rtree index support for line, lseg, path, point
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* Make binary/file in/out interface for TOAST columns
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@ -129,11 +89,7 @@ TYPES
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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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* Automatically create rules on views so they are updateable, per SQL92
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* -Change elog for complex view ins|upd|del to "cannot {ins|upd|del}
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* Add the functionality for "with check option" clause of create view
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* Allow NOTIFY in rules involving conditionals
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* Evaluate INSERT rules at end of query, rather than beginning
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@ -142,7 +98,6 @@ 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 SQL function indexes
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* Add FILLFACTOR to index creation
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* Re-enable partial indexes
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* Allow inherited tables to inherit index, UNIQUE constraint, and primary key
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@ -156,12 +111,9 @@ COMMANDS
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* ALTER TABLE ADD COLUMN to inherited table put column in wrong place
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[inheritance]
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* -Add ALTER TABLE ALTER COLUMN feature (Peter E)
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* Add ALTER TABLE DROP COLUMN feature [drop]
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* -Add ALTER TABLE command to change table ownership (Mark H)
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* Add ALTER FUNCTION
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* Add ALTER TABLE ... DROP CONSTRAINT
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* -Add ALTER USER command to change user db attributes (Peter E)
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* Automatically drop constraints/functions when object is dropped
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* CLUSTER
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* cluster all tables at once
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@ -175,14 +127,7 @@ COMMANDS
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* Allow INSERT/UPDATE of system-generated oid value for a row
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* Allow INSERT INTO my_table VALUES (a, b, c, DEFAULT, x, y, z, ...)
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* Allow INSERT INTO tab (col1, ..) VALUES (val1, ..), (val2, ..)
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* -Allow multi-level query trees for INSERT INTO ... SELECT
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* -Allow ORDER BY...LIMIT in INSERT INTO ... SELECT (Tom)
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* -Allow ESCAPE '\' at the end of LIKE for ANSI compliance (Thomas)
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* -Rewrite the LIKE handling by rewriting the user string with the
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supplied ESCAPE
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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
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* Allow BINARY option to SELECT, like we do with DECLARE
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* MOVE 0 should not move to end of cursor
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* Overhaul ACL (access control) code
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@ -191,7 +136,6 @@ COMMANDS
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columns, allow DEFAULT
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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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* -redesign UNION structures to have separarate target lists
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* Add BETWEEN ASYMMETRIC/SYMMETRIC
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CLIENTS
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@ -203,14 +147,11 @@ CLIENTS
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* Allow specification of column names
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* Allow dump/load of CSV format
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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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* have pg_dump use LEFT OUTER JOIN in multi-table SELECTs
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or multiple SELECTS to avoid bad system catalog entries
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* -make pg_dump dump in oid order, so dependencies are resolved (Philip)
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* allow psql \d to show primary and foreign keys
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* allow psql \d to show temporary table structure
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* add XML interface capability
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* -Allow dumping of users/groups separately
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* Add a global RESET command for use with connection pooling
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* Remove <=6.3 version compatibility in ODBC?
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* Add SET REAL_FORMAT and SET DOUBLE_PRECISION_FORMAT using printf args
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@ -221,8 +162,6 @@ REFERENTIAL INTEGRITY
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* Check that primary key exists at foreign key definition time
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* Prevent column dropping if column is used by foreign key
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* Propagate column or table renaming to foreign key constraints
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* -Emit a warning at foreign key creation time if no UNIQUE index
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exists on referenced primary key attributes
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* Add deferred trigger queue file (Jan)
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* Allow oid to act as a foreign key
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* Implement dirty reads and use them in RI triggers
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@ -252,18 +191,13 @@ MISCELLANEOUS
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* Increase identifier length(NAMEDATALEN) if small performance hit
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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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* -Transaction log, so re-do log can be on a separate disk with after-row
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images (Vadim)
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* Implement UNDO using transaction log
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* Populate backend status area and write program to dump status data
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* Put sort files in their own directory
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* Allow 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 (Tom)
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* Overhaul bufmgr/lockmgr/transaction manager
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* -Use IPC_EXCL when creating shared memory and semaphores (Tom)
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* Encrpyt passwords in pg_shadow table using MD5 (Vince)
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* -Use flock() to prevent multiple postmasters on the same port (Tom)
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* Allow Java server-side programming [java]
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* Add sed-like regular expression search/replace capability
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@ -272,8 +206,6 @@ PERFORMANCE
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-FSYNC
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* -Allow transaction commits with rollback with no-fsync performance
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(Vadim)
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* Delay fsync() when other backends are about to commit too [fsync]
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* Determine optimal commit_delay value
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* Determine optimal fdatasync/fsync, O_SYNC/O_DSYNC options
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@ -286,8 +218,6 @@ INDEXES
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non-consecutive keys or OR clauses, so fewer heap accesses
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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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* -Include heap CTID in btree index keys, remove equal-key cruft from
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btree (Tom)
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* Use indexes with CIDR '<<' (contains) operator
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* Allow LIKE indexing optimization for non-ASCII locales
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* Be smarter about insertion of already-ordered data into btree index
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@ -305,7 +235,6 @@ VACUUM
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* Improve speed with indexes (perhaps recreate index instead) [vacuum]
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* Reduce lock time by moving tuples with read lock, then write
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lock and truncate table [vacuum]
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* -Redesign ANALYZE in VACUUM so it can be run separately without locks
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* Make ANALYZE a separate command
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* Allow ANALYZE to ESTIMATE based on certain random precentage of rows
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* Add LAZY VACUUM (Vadim)
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@ -317,14 +246,10 @@ MISCELLANEOUS
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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(?) [mmap]
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* -Make oid use oidin/oidout not int4in/int4out in pg_type.h (Tom)
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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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* -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 (Tom)
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* -In WHERE tab1.x=3 AND tab1.x=tab2.y, add tab2.y=3
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* allow configuration of maximum number of open files
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* Remove pg_listener index
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* Improve statistics storage in pg_class [performance]
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@ -341,14 +266,9 @@ MISCELLANEOUS
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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 (Tom)
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* Does Mariposa source contain any other bug fixes?
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* Remove SET KSQO option now that OR processing is improved (Tom)
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* -Use macros to define NT open() file parameters, remove NT-specific defines
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* -Change CURRENT to OLD internally for rules (Bruce)
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* Convert remaining fprintf(stderr,...)/perror() to elog()
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* -Allow libedit to be used in place of libreadline
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* -BSD/OS does not support locale because there is no LC_MESSAGES (Bruce)
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* Remove unused pg_variable, pg_inheritproc, pg_ipl tables
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* Experiment with multi-threaded backend [thread]
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* Fix problems with libpq non-blocking/async code [async]
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