330 lines
13 KiB
Plaintext
330 lines
13 KiB
Plaintext
TODO list for PostgreSQL
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========================
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Last updated: Sat Dec 23 09:48:47 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 7.1 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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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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[inherit]
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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
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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(inherit)
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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
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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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ENHANCEMENTS
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------------
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URGENT
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* -Add OUTER joins, left and right[outer](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[memory](Tom?)
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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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* Convert remaining fprintf(stderr,...) to elog()
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* Allow elog() to return error codes, module name, file name, line
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number, not just messages
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* Allow international error message support and add error codes
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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
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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)
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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 [cidr]
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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 nulls in arrays
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* Allow arrays to be ORDER'ed
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* Support construction of array result values in expressions
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* Change foreign key constraint for array -> element to mean element
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in array
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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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* Functions returning sets don't really work right[function]
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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, bit, varbit
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* Add rtree index support for line, lseg, path, point
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* Make file in/out interface to TOAST columns
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* SELECT cash_out(2) crashes because of opaque
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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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* Create insert, update and delete rules for simple one table views
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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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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
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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 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
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* Automatically drop constraints/functions when object is dropped
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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
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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 [lock]
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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 (Thomas)
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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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* 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 INSERT INTO my_table VALUES (a, b, c, DEFAULT, x, y, z, ...)
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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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* Allow ORDER BY...LIMIT in INSERT INTO ... SELECT
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* Add SHOW command to display locks
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* Allow INSERT INTO tab (col1, ..) VALUES (val1, ..), (val2, ..)
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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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* Update reltuples from COPY command
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* Allow COPY to specify column names
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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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* -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 schema
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* add XML interface capability
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* -Allow dumping of users/groups separately
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REFERENTIAL INTEGRITY
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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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* 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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EXOTIC FEATURES
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* Add sql3 recursive unions
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* Add the concept of dataspaces/tablespaces [tablespaces]
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* Add replication of distributed databases [replication]
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* Allow queries across multiple databases
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* Allow nested transactions (Vadim)
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* Allow INSERT/UPDATE to return new.col or old.col (Philip)
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* SQL*Net listener that makes PostgreSQL appear as an Oracle database
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to clients
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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 cursors to be DECLAREd/OPENed/CLOSEed outside transactions
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* Allow DELETE WHERE CURRENT OF cursor
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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)
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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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* 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[function](Tom)
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* Missing optimizer selectivities for date, r-tree, etc. [optimizer]
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* Overhaul bufmgr/lockmgr/transaction manager
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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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* Use IPC_EXCL when creating shared memory and semaphores
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* have pg_upgrade use pg_ctl to stop/start postmaster
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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 [flock]
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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
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(Vadim)
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INDEXES
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* Use indexes to find min() and 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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* 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 btree
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* Use indexes with CIDR '<<' (contains) operator
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* Fix LIKE indexing optimization for non-ASCII locales
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CACHE
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* Cache most recent query plan(s) (Karel) [prepare]
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* Shared catalog cache, reduce lseek()'s by caching table size in shared area
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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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* Do async I/O to do better read-ahead of data
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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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* 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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* -In WHERE tab1.x=3 AND tab1.x=tab2.y, add tab2.y=3
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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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* Remove pg_listener index
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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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* Gather more accurate dispersion statistics using indexes
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* Keep statistics about clustering of table rows [optimizer]
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* Improve statistics storage in pg_class [performance]
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* Improve VACUUM speed with indexes [vacuum]
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* Reduce VACUUM lock time by moving tuples with read lock, then write
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lock and truncate table [vacuum]
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* -BSD/OS does not support locale because there is no LC_MESSAGES (Bruce)
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* Add connection pooling [pool]
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* Allow persistent backends [persistent]
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* Add SET PERFORMANCE_TIPS option to suggest INDEX, VACUUM, VACUUM
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ANALYZE, and CLUSTER
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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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* replace the use of fprint(stderr, ...) with elog() in backend code
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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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* D'Arcy is D'Arcy J.M. Cain <darcy@druid.net>
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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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* Karel is Karel Zak <zakkr@zf.jcu.cz>
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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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* Mark is Mark Hollomon <mhh@mindspring.com>
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* Massimo is 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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* Philip is Philip Warner <pjw@rhyme.com.au>
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* Peter E is Peter Eisentraut<peter_e@gmx.net>
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* Ross is Ross J. Reedstrom <reedstrm@wallace.ece.rice.edu>
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* Ryan is Ryan Bradetich <rbrad@hpb50023.boi.hp.com>
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* Stephan is Stephan Szabo <sszabo@megazone23.bigpanda.com>
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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 <vadim4o@email.com>
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<EFBFBD>5~
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