285 lines
11 KiB
Plaintext
285 lines
11 KiB
Plaintext
TODO list for PostgreSQL
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========================
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Last updated: Wed Jul 28 13:51:59 EDT 1999
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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 web site, http://www.PostgreSQL.org.
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A dash(-) marks changes that will appear in the next release.
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RELIABILITY
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-----------
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RESOURCES
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* Elog() does not free all its memory(Jan)
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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
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PARSER
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* Disallow inherited columns with the same name as new columns
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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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* Do not allow bpchar column creation without length
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* Select a[1] FROM test fails, it needs test.a[1]
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* -Array index references without table name cause problems
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* Update table SET table.value = 3 fails
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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
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* -CREATE TABLE test (a char(5) DEFAULT text '', b int4) fails on INSERT
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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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* 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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* SELECT ... UNION ... ORDER BY fails when sort expr not in result list
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* Be smarter about promoting types when UNION merges different data types
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* SELECT ... UNION ... GROUP BY fails if column types disagree
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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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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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MISC
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* User who can create databases can modify pg_database table
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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)
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* pg_dump should preserve primary key information
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ENHANCEMENTS
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------------
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URGENT
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* Add referential integrity(Jan?)
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* Add OUTER joins, left and right(Thomas, Bruce)
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* Allow long tuples by chaining or auto-storing outside db (chaining,large objs)
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* Eliminate limits on query length
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* Fix memory leak for expressions?, aggregates?(Tom?)
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ADMIN
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* Better interface for adding to pg_group
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* More access control over who can create tables and access the database
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* Add 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
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* Add ability to specifiy location of lock/socket files
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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 Allow large text type to use large objects(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 types, tables, 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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* Allow user to define char1 column
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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 array on int8[]
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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
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* Make Absolutetime/Relativetime int4 because time_t can be int8 on some ports
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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?
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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
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* Add ALTER TABLE DROP/ALTER COLUMN feature
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* Allow CLUSTER on all tables at once, and improve CLUSTER
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* Generate error on CREATE OPERATOR of ~~, ~ and and ~*
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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
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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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* Move LIKE index optimization handling to the optimizer
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* Allow RULE recompilation
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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
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* Update reltuples from COPY command
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* Allow psql \copy to allow delimiters
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* Add a function to return the last inserted oid, for use in psql scripts
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* Allow psql to print nulls as distinct from ""(?)
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* PQrequestCancel() be able to terminate backend waiting for lock
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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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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
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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
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* Allow cursors to be DECLAREd/OPENed/CLOSEed outside transactions
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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)
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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
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* Put sort files, large objects in their on directory
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* Do autocommit so always in a transaction block
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* Show location of syntax error in query
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* Redesign the function call interface to handle NULLs better(Jan)
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* Document/trigger/rule so changes to pg_shadow create pg_pwd
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* Missing optimizer selectivities for date, r-tree, etc.
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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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* Make postgres user have a password by default
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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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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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* Prevent fsync in SELECT-only queries
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INDEXES
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* Use indexes in ORDER BY for restrictive data sets, min(), max()
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* Pull requested data directly from indexes, bypassing heap data
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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
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* Allow LIMIT ability on single-table queries that have no ORDER BY to use
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a matching index
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* Improve LIMIT processing by using index to limit rows processed
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* Have optimizer take LIMIT into account when considering index scans
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* Make index creation use psort code, because it is now faster(Vadim)
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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 free
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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
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* Allow optimizer to prefer plans that match ORDER BY
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CACHE
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* Cache most recent query plan(s?)
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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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* Update pg_statistic table to remove operator column
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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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* Fix memory exhaustion when using many OR's
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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
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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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* 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
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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(Bruce)
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* remove duplicate type in/out functions for disk and net
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SOURCE CODE
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-----------
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* Add use of 'const' for varibles in source tree
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* Fix C optimizer problem where fmgr_ptr calls return different types
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* Add needed includes and removed unneede include files(Bruce)
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* Make configure --enable-debug add -g on compile line
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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<maillist@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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* 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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