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f66393514f
postgresql/doc/TODO
Bruce Momjian f66393514f One last missing quoting bug in pg_dump: 
now that sequence names are properly quoted for field defaults, mixed
case sequence names are generated. These are properly quoted in the
CREATE SEQUENCE lines, but not in the SELECT nextval lines, as per
below:

CREATE SEQUENCE "Teams_TeamID_seq" start 10 increment 1 maxvalue
2147483647 minvalue 1  cache 1 ;
SELECT nextval ('Teams_TeamID_seq');

This needs to be:
SELECT nextval ('"Teams_TeamID_seq"');

Patch included below.
--
Ross J. Reedstrom, Ph.D., <reedstrm@rice.edu>
1999-09-23 19:11:09 +00:00

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TODO list for PostgreSQL
========================
Last updated: Tue Sep 21 15:54:14 EDT 1999
Current maintainer: Bruce Momjian (maillist@candle.pha.pa.us)
The most recent version of this document can be viewed at
the PostgreSQL web site, http://www.PostgreSQL.org.
A dash(-) marks changes that will appear in the next release.
RELIABILITY
-----------
RESOURCES
* Elog() does not free all its memory(Jan)
* spinlock stuck problem when elog(FATAL) and elog(ERROR) inside bufmgr
* Recover or force failure when disk space is exhausted
PARSER
* Disallow inherited columns with the same name as new columns
* INSERT INTO ... SELECT with AS columns matching result columns problem
* SELECT pg_class FROM pg_class generates strange error
* Alter TABLE ADD COLUMN does not honor DEFAULT, add CONSTRAINT
* Do not allow bpchar column creation without length
* Select a[1] FROM test fails, it needs test.a[1]
* -Array index references without table name cause problems
(see TODO.detail/array)
* Update table SET table.value = 3 fails
* Creating index of TIMESTAMP & RELTIME fails, or rename to DATETIME(Thomas)
* SELECT foo UNION SELECT foo is incorrectly simplified to SELECT foo
* -INSERT ... SELECT ... GROUP BY groups by target columns not source columns
* -CREATE TABLE test (a char(5) DEFAULT text '', b int4) fails on INSERT
* UNION with LIMIT fails
* Unique index on base column not honored on inserts from inherited table
INSERT INTO inherit_table (unique_index_col) VALUES (dup) should fail
(see TODO.detail/inherit)
* CREATE TABLE x AS SELECT 1 UNION SELECT 2 fails
* CREATE TABLE test(col char(2) DEFAULT user) fails in length restriction
* mismatched types in CREATE TABLE ... DEFAULT causes problems
(see TODO.detail/default)
* SELECT ... UNION ... ORDER BY fails when sort expr not in result list
* Be smarter about promoting types when UNION merges different data types
* SELECT ... UNION ... GROUP BY fails if column types disagree
* redesign INSERT ... SELECT to have two levels of target list
* -select * from pg_class where oid in (0,-1)
* have INTERSECT/EXCEPT prevent duplicates unless ALL is specified
* prevent primary key of nine columns(see TODO.detail/primary)
VIEWS
* Views containing aggregates sometimes fail(Jan)
* Views with spaces in view name fail when referenced
MISC
* User who can create databases can modify pg_database table
* Plpgsql does not handle quoted mixed-case identifiers
* Fix btree to give a useful elog when key > 1/2 (page - overhead)
* pg_dump should preserve primary key information
ENHANCEMENTS
------------
URGENT
* Add referential integrity(Jan?)(see TODO.detail/primary)
* Add OUTER joins, left and right(see TODO.detail/outer)(Thomas, Bruce)
* Allow long tuples by chaining or auto-storing outside db (chaining,large objs)
* Eliminate limits on query length
* Fix memory leak for expressions?, aggregates?(see TODO.detail/memory)(Tom?)
ADMIN
* Better interface for adding to pg_group
* More access control over who can create tables and access the database
* Add syslog functionality
* Allow elog() to return error codes, not just messages
* Allow international error message support and add error codes
* Generate postmaster pid file and remove flock/fcntl lock code
(see TODO.detail/flock)
* Add ability to specifiy location of lock/socket files (see TODO.detail/flock)
TYPES
* Add BIT, BIT VARYING
* Nchar (as distinguished from ordinary varchar),
* Domain capability
* Add STDDEV/VARIANCE() function for standard deviation computation/variance
* Allow compression of large fields or a compressed field type
* Large objects
o Fix large object mapping scheme, own typeid or reltype(Peter)
o Allow large text type to use large objects(Peter)
o Not to stuff everything as files in a single directory, hash dirs
o Allow large object vacuuming
o Tables that start with xinv confused to be large objects
* Allow pg_descriptions when creating types, tables, columns, and functions
* Add IPv6 capability to INET/CIDR types
* Make a separate SERIAL type?
* Store binary-compatible type information in the system
* Allow user to define char1 column
* Add support for & operator
* Allow LOCALE on a per-column basis, default to ASCII
* Allow array on int8[]
* Allow nulls in arrays
* Remove Money type, add money formatting for decimal type
* Declare typein/out functions in pg_proc with a special "C string" data type
* Add non-large-object binary field
* Add index on NUMERIC/DECIMAL type
* Make Absolutetime/Relativetime int4 because time_t can be int8 on some ports
* Functions returning sets don't really work right(see TODO.detail/function)
VIEWS
* Allow DISTINCT on views
* Allow views of aggregate columns
* Allow views with subselects
INDEXES
* Allow CREATE INDEX zman_index ON test (date_trunc( 'day', zman ) datetime_ops)
fails index can't store constant parameters
* Allow creation of functional indexes to use default types
* Permissions on indexes - prevent them?
* Allow SQL function indexes
* Add FILLFACTOR to index creation
* Allow indexing of LIKE with localle character sets
* Allow indexing of more than eight columns
COMMANDS
* ALTER TABLE ADD COLUMN to inherited table put column in wrong place
(see TODO.detail/inherit)
* Add ALTER TABLE DROP/ALTER COLUMN feature
* Allow CLUSTER on all tables at once, and improve CLUSTER, loses NOT
NULL specification on table(see TODO.detail/cluster)
* Generate error on CREATE OPERATOR of ~~, ~ and and ~*
* Add SIMILAR TO to allow character classes, 'pg_[a-c]%'
* Auto-destroy sequence on DROP of table with SERIAL(Ryan)
* Allow LOCK TABLE tab1, tab2, tab3 so all tables locked in unison
* Allow INSERT/UPDATE of system-generated oid value for a row
* Allow ESCAPE '\' at the end of LIKE for ANSI compliance(see TODO.detail/like)
* Rewrite the LIKE handling by rewriting the user string with the
supplied ESCAPE(see TODO.detail/like)
* Move LIKE index optimization handling to the optimizer
* Allow RULE recompilation
* Support UNION/INTERSECT/EXCEPT in sub-selects
CLIENTS
* Make NULL's come out at the beginning or end depending on the
ORDER BY direction
* Allow flag to control COPY input/output of NULLs
* Update reltuples from COPY command
* Allow psql \copy to allow delimiters
* Add a function to return the last inserted oid, for use in psql scripts
* Allow psql to print nulls as distinct from ""(see TODO.detail/null)
* PQrequestCancel() be able to terminate backend waiting for lock
EXOTIC FEATURES
* Add sql3 recursive unions
* Add the concept of dataspaces
* Add replication of distributed databases
* Allow queries across multiple databases
MISC
* Increase identifier length(NAMEDATALEN) if small performance hit
* Allow row re-use without vacuum(Vadim)
* Create a background process for each database that runs while
database is idle, finding superceeded rows, gathering stats and vacuuming
* Add UNIQUE capability to non-btree indexes
* -Certain indexes will not shrink, i.e. oid indexes with many inserts
* Restore unused oid's on backend exit if no one else has gotten oids
* Have UPDATE/DELETE clean out indexes
* Allow WHERE restriction on ctid
* Allow cursors to be DECLAREd/OPENed/CLOSEed outside transactions
* Allow PQrequestCancel() to terminate when in waiting-for-lock state
* -Transaction log, so re-do log can be on a separate disk by
with after-row images(Vadim) (see TODO.detail/logging)
* Populate backend status area and write program to dump status data
* Make oid use unsigned int more reliably, pg_atoi()
* Allow subqueries in target list
* Put sort files, large objects in their own directory
* Do autocommit so always in a transaction block(?)
* Show location of syntax error in query (see TODO.detail/yacc)
* Redesign the function call interface to handle NULLs better
(see TODO.detail/function)
* Document/trigger/rule so changes to pg_shadow recreate pg_pwd
(see TODO.detail/pg_shadow)
* Missing optimizer selectivities for date, r-tree, etc.
(see TODO.detail/optimizer)
* Overhaul mdmgr/smgr to fix double unlinking and double opens, cleanup
* Overhaul bufmgr/lockmgr/transaction manager
* Add PL/Perl(Mark Hollomon)
* Make postgres user have a password by default
* Add configure test to check for C++ need for *.h and namespaces
* Allow BLCKSZ <= 64k, not <= 32k
* redesign UNION structures to have separarate target lists
* Allow multi-level query trees for INSERT INTO ... SELECT
PERFORMANCE
-----------
FSYNC
* -Allow transaction commits with rollback with no-fsync performance
(see TODO.detail/fsync)
* -Prevent fsync in SELECT-only queries
INDEXES
* Use indexes in ORDER BY for restrictive data sets, min(), max()
* Pull requested data directly from indexes, bypassing heap data
* Use index to restrict rows returned by multi-key index when used with
non-consecutive keys or OR clauses, so fewer heap accesses
* Convert function(constant) into a constant for index use
* Allow LIMIT ability on single-table queries that have no ORDER BY to use
a matching index(see TODO.detail/limit)
* Improve LIMIT processing by using index to limit rows processed
(see TODO.detail/limit)
* Have optimizer take LIMIT into account when considering index scans
(see TODO.detail/limit)
* Make index creation use psort code, because it is now faster(Vadim)
* Allow creation of sort temp tables > 1 Gig
* Create more system table indexes for faster cache lookups
* fix indexscan() so it does leak memory by not requiring caller to free
* Improve _bt_binsrch() to handle equal keys better, remove _bt_firsteq()(Tom)
* Allow SELECT * FROM tab WHERE int2col = 4 use int2col index
(see TODO.detail/optimizer)
* Allow optimizer to prefer plans that match ORDER BY
CACHE
* Cache most recent query plan(s)(see TODO.detail/prepare)
* Shared catalog cache, reduce lseek()'s by caching table size in shared area
* elog() flushes cache, try invalidating just entries from current xact,
perhaps using invalidation cache
MISC
* Allow compression of log and meta data
* Update pg_statistic table to remove operator column
* Allow char() not to use variable-sized header to reduce disk size
* Do async I/O to do better read-ahead of data
* -Fix memory exhaustion when using many OR's(see TODO.detail/cnfify)
* Get faster regex() code from Henry Spencer <henry@zoo.utoronto.ca>
when it is available
* Use mmap() rather than SYSV shared memory(?)
* Process const = const parts of OR clause in separate pass
* Make oid use oidin/oidout not int4in/int4out in pg_type.h
* Improve Subplan list handling
* Allow Subplans to use efficient joins(hash, merge) with upper variable
* 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(see TODO.detail/memory)
* fix memory leak in cache code when non-existant table is referenced
* In WHERE tab1.x=3 AND tab1.x=tab2.y, add tab2.y=3
* pass atttypmod through parser in more cases(see TODO.detail/atttypmod)
* remove duplicate type in/out functions for disk and net
* change VACUUM ANALYZE to use btree comparison functions, not <,=,> calls
* Allow persistent backends(see TODO.detail/persistent)
* Misc(see TODO.detail/performance)
SOURCE CODE
-----------
* Add use of 'const' for varibles in source tree
* Fix C optimizer problem where fmgr_ptr calls return different types
(see TODO.detail/alpha)
* -Add needed includes and removed unneeded include files(Bruce)
* Make configure --enable-debug add -g on compile line
* Does Mariposa source contain any other bug fixes?
* Remove SET KSQO option if OR processing is improved
---------------------------------------------------------------------------
Developers who have claimed items are:
--------------------------------------
* Billy is Billy G. Allie <Bill.Allie@mug.org>
* Brook is Brook Milligan <brook@trillium.NMSU.Edu>
* Bruce is Bruce Momjian<maillist@candle.pha.pa.us>
* Bryan is Bryan Henderson<bryanh@giraffe.netgate.net>
* D'Arcy is D'Arcy J.M. Cain <darcy@druid.net>
* David is David Hartwig <daveh@insightdist.com>
* Edmund is Edmund Mergl <E.Mergl@bawue.de>
* Goran is Goran Thyni <goran@kyla.kiruna.se>
* Hiroshi is Hiroshi Inoue<Inoue@tpf.co.jp>
* Jan is Jan Wieck <wieck@sapserv.debis.de>
* Marc is Marc Fournier <scrappy@hub.org>
* Massimo Dal Zotto <dz@cs.unitn.it>
* Michael is Michael Meskes <meskes@postgresql.org>
* Oleg is Oleg Bartunov <oleg@sai.msu.su>
* Peter is Peter T Mount <peter@retep.org.uk>
* Ryan is Ryan Bradetich <rbrad@hpb50023.boi.hp.com>
* Stefan Simkovics <ssimkovi@rainbow.studorg.tuwien.ac.at>
* Tatsuo is Tatsuo Ishii <t-ishii@sra.co.jp>
* Tom is Tom Lane <tgl@sss.pgh.pa.us>
* Thomas is Thomas Lockhart <lockhart@alumni.caltech.edu>
* TomH is Tom I Helbekkmo <tih@Hamartun.Priv.NO>
* Vadim is "Vadim B. Mikheev" <vadim@krs.ru>
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