TODO list for PostgreSQL

========================

Last updated:Thu Jan 4 03:15:12 EST 2001

Last updated:Thu Jan 4 03:24:53 EST 2001

Current maintainer:Bruce Momjian (pgman@candle.pha.pa.us)

[inherit]

* -Be smarter about promoting types when UNION merges different data types

* -redesign INSERT ... SELECT to have two levels of target list

* have INTERSECT/EXCEPT prevent duplicates unless ALL is specified

* SELECT col::DECIMAL(12,10); fails

*-have INTERSECT/EXCEPT prevent duplicates unless ALL is specified (Tom)

*-SELECT col::DECIMAL(12,10); fails

VIEWS

* -Views containing aggregates sometimes fail (Jan)

* Creating view and inheriting the view causes view* to show

*-Creating view and inheriting the view causes view* to show

duplicates (inherit)

* -Disallow LOCK on view (Mark Hollomon)

MISC

* Plpgsql does not handle quoted mixed-case identifiers

* Buffer reference counting bugfixes

* Fix libpq bug that causes it to drop backend error message sent

*-Buffer reference counting bugfixes (Tom)

*-Fix libpq bug that causes it to drop backend error message sent

just before connection closure (ie, any FATAL error message)

* -SELECT ... UNION ... ORDER BY fails when sort expr not in result list

* -SELECT ... UNION ... GROUP BY fails if column types disagree, no type

promotion occurs

* Modification of pg_class can happen while table in use by

*-Modification of pg_class can happen while table in use by

another backend. Might lead to MVCC inside of syscache

* Permission to DELETE table allows UPDATE also

* -Add OUTER joins, left and right[outer] (Tom, Thomas)

* -Allow long tuples by chaining or auto-storing outside db (TOAST) (Jan)

* Fix memory leak for expressions[memory] (Tom?)

*-Fix memory leak for expressions[memory] (Tom)

* Add replication of distributed databases [replication]

o automatic fallover

o load balancing

* Make functions more multi-byte aware, i.e. trim()

* Make n of CHAR(n)/VARCHAR(n) the number of letters, not bytes

* -Update macaddr manufacturer numbers, or remove the function macaddr_manuf()

* Add btree index support for reltime, tinterval, regproc, bit, varbit

* Add btree index support for reltime, tinterval, regproc

* Add rtree index support for line, lseg, path, point

* Make binary/file in/out interface for TOAST columns

* SELECT cash_out(2) crashes because of opaque

* -Allow DISTINCT on views

* -Allow views of aggregate columns

* -Allow views with subselects

*Create insert, update and delete rules for simple one table views

*Automatically create rules on views so they are updateable, per SQL92

* -Change elog for complex view ins|upd|del to "cannot {ins|upd|del}

* Add the functionality for "with check option" clause of create view

* Automatically create rules on views so they are updateable, per SQL92

INDEXES

* Allow BINARY option to SELECT, like we do with DECLARE

* MOVE 0 should not move to end of cursor

* Overhaul ACL (access control) code

* Allow ORDER BY...LIMIT in INSERT INTO ... SELECT

*-Allow ORDER BY...LIMIT in INSERT INTO ... SELECT (Tom)

* Add SHOW command to display locks

CLIENTS

* Check that primary key exists at foreign key definition time

* Prevent column dropping if column is used by foreign key

* Propagate column or table renaming to foreign key constraints

* Emit a warning at foreign key creation time if no UNIQUE index

exists on referenced primary key attributes

*-Emit a warning at foreign key creation time if no UNIQUE index

exists on referenced primary key attributes (Tom)

* Add deferred trigger queue file (Jan)

* Allow oid to act as a foreign key

* Implement dirty reads and use them in RI triggers

* Overhaul bufmgr/lockmgr/transaction manager

* -redesign UNION structures to have separarate target lists

* -Allow multi-level query trees for INSERT INTO ... SELECT

* Use IPC_EXCL when creating shared memory and semaphores

*-Use IPC_EXCL when creating shared memory and semaphores (Tom)

* have pg_upgrade use pg_ctl to stop/start postmaster

* Encrpyt passwords in pg_shadow table using MD5 (Vince)

* Use flock() to prevent multiple postmasters on the same port[flock]

*-Use flock() to prevent multiple postmasters on the same port(Tom)

* Allow Java server-side programming

PERFORMANCE

non-consecutive keys or OR clauses, so fewer heap accesses

* Allow SELECT * FROM tab WHERE int2col = 4 use int2col index, int8,

float4, numeric/decimal too [optimizer]

* Include heap CTID in btree index keys, remove equal-key cruft from btree

* -Include heap CTID in btree index keys, remove equal-key cruft from

btree (Tom)

* Use indexes with CIDR '<<' (contains) operator

*Fix LIKE indexing optimization for non-ASCII locales

*Allow LIKE indexing optimization for non-ASCII locales

CACHE

MISC

* Allow compression of log and meta data

* Allow char() not to use variable-sized header to reduce disk size

* Do async I/O to do better read-ahead of data

* Get faster regex() code from Henry Spencer <henry@zoo.utoronto.ca>

when it is available

* Use mmap() rather than SYSV shared memory(?)

* Make oid use oidin/oidout not int4in/int4out in pg_type.h

*-Make oid use oidin/oidout not int4in/int4out in pg_type.h (Tom)

* Improve Subplan list handling

* Allow Subplans to use efficient joins(hash, merge) with upper variable

[subquery]

* -use fmgr_info()/fmgr_faddr() instead of fmgr() calls in high-traffic

places, like GROUP BY, UNIQUE, index processing, etc.

* improve dynamic memory allocation by introducing tuple-context memory

allocation[memory]

allocation(Tom)

* -In WHERE tab1.x=3 AND tab1.x=tab2.y, add tab2.y=3

* prevent labels from being output for stored rules (Tom)

* allow configuration of maximum number of open files

* Remove pg_listener index

* -Redesign ANALYZE in VACUUM so it can be run separately without locks