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507 lines
19 KiB
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507 lines
19 KiB
Plaintext
TODO list for PostgreSQL
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========================
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Last updated: Mon Feb 25 15:29:56 EST 2002
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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 7.3 release.
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Bracketed items "[]" have more detailed.
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URGENT
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------
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* Add replication of distributed databases [replication]
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o automatic failover
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o load balancing
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o master/slave replication
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o multi-master replication
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o partition data across servers
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o sample implementation in contrib/rserv
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o queries across databases or servers (two-phase commit)
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o http://gborg.postgresql.org/project/pgreplication/projdisplay.php
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* Point-in-time data recovery using backup and write-ahead log
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REPORTING
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---------
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* Allow elog() to return error codes, module name, file name, line
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number, not just messages (Peter E)
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* Add error codes (Peter E)
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* Change DEBUG startup tag to NOTICE (Bruce)
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* Show location of syntax error in query [yacc]
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PERMISSIONS
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-----------
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* Improve control over user privileges, including table creation and
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lock use [privileges] (Karel, others)
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* Allow usernames to be specified directly in pg_hba.conf (Bruce)
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* Add PGPASSWORDFILE environment variable or ~/.pgpass to store
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user/host/password combinations
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* Remove PGPASSWORD because is insecure on some OS's
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* Make single-user local access permissions the default by limiting
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permissions on the socket file (Peter E)
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* Use thread-safe crypt() in libpq, if available
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* -Allow permissions for functions (Peter E)
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ADMIN
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-----
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* Incremental backups
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* -Make it easier to create a database owned by someone who can't createdb,
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perhaps CREATE DATABASE dbname WITH OWNER = "user" (Gavin)
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* -Make equals sign optional in CREATE DATABASE WITH param = 'val'
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* Remove unreferenced table files and temp tables during database vacuum
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or postmaster startup (Bruce)
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* Add table name mapping for numeric file names (Bruce)
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* Remove behavior of postmaster -o after making postmaster/postgres
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flags unique
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* Allow logging of query durations
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* -Prevent SIGHUP and 'pg_ctl reload' from changing command line
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specified parameters to postgresql.conf defaults
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DATA TYPES
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----------
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* Add domain capability [domain]
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* Add IPv6 capability to INET/CIDR types
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* Remove Money type, add money formatting for decimal type
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* SELECT cash_out(2) crashes because of opaque
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* Declare typein/out functions in pg_proc with a special "C string" data type
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* Functions returning sets do not totally work
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* Change factorial to return a numeric
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* Add function to return compressed length of TOAST data values (Tom)
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* CONVERSION
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o Store binary-compatible type information in the system
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o Allow better handling of numeric constants, type conversion
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[typeconv]
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o SELECT col FROM tab WHERE numeric_col = 10.1 fails, requires quotes
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* ARRAYS
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o Allow nulls in arrays
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o Allow arrays to be ORDER'ed
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o Ensure we have array-eq operators for every built-in array type
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o Support construction of array result values in expressions
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* BINARY DATA
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o Improve vacuum of large objects, like /contrib/vacuumlo
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o Add security checking for large objects
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o Make file in/out interface for TOAST columns, similar to large object
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interface (force out-of-line storage and no compression)
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o Auto-delete large objects when referencing row is deleted
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MULTI-LANGUAGE SUPPORT
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----------------------
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* Add NCHAR (as distinguished from ordinary varchar),
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* Allow LOCALE on a per-column basis, default to ASCII
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* Support multiple simultaneous character sets, per SQL92
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* Allow setting database character set without multibyte enabled
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* Improve Unicode combined character handling
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* Optimize locale to have minimal performance impact when not used (Peter E)
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* Add octet_length_server() and octet_length_client() (Thomas, Tatsuo)
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* Make octet_length_client the same as octet_length() (?)
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VIEWS / RULES
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-------------
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* Automatically create rules on views so they are updateable, per SQL92 [view]
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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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* Allow temporary views
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* Move psql backslash information into views
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* Allow RULE recompilation
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* Remove brackets as multi-statement rule grouping, must use parens
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INDEXES
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-------
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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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* Order duplicate index entries by tid for faster heap lookups
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* Allow inherited tables to inherit index, UNIQUE constraint, and primary
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key, foreign key [inheritance]
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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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* Allow UPDATE/DELETE on inherited table
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* Have UPDATE/DELETE clean out indexes
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* Add UNIQUE capability to non-btree indexes
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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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* Certain indexes will not shrink, e.g. oid indexes with many inserts
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* Use indexes for min() and max() or convert to SELECT col FROM tab ORDER
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BY col DESC LIMIT 1 if appropriate index exists and WHERE clause acceptible
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* Allow LIKE indexing optimization for non-ASCII locales
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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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* Be smarter about insertion of already-ordered data into btree index
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* Add deleted bit to index tuples to reduce heap access
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* Prevent index uniqueness checks when UPDATE does not modifying column
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* Add bitmap indexes [performance]
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* Improve handling of index scans for NULL
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* Allow SELECT * FROM tab WHERE int2col = 4 to use int2col index, int8,
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float4, numeric/decimal too [optimizer]
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* Improve concurrency in GIST
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* Add FILLFACTOR to index creation
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* Improve concurrency of hash indexes
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* Test hash index performance and recommend or discourage usage
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COMMANDS
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--------
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* Add SIMILAR TO to allow character classes, 'pg_[a-c]%'
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* Add BETWEEN ASYMMETRIC/SYMMETRIC
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* -Remove LIMIT #,# and force use LIMIT and OFFSET clauses in 7.3 (Bruce)
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* Allow LIMIT/OFFSET to use expressions
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* Disallow TRUNCATE on tables that are involved in referential constraints
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* Add OR REPLACE clauses to non-FUNCTION object creation
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* CREATE TABLE AS can not determine column lengths from expressions [atttypmod]
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* Allow UPDATE to handle complex aggregates [update]
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* -Prevent create/drop scripts from allowing extra args (Bruce)
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* Allow command blocks to ignore certain types of errors
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* Add checks for missing parameters to shell script, to prevent
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over-shifting
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* ALTER
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o ALTER TABLE ADD COLUMN does not honor DEFAULT and non-CHECK CONSTRAINT
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o ALTER TABLE ADD COLUMN to inherited table put column in wrong place
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[inheritance]
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o Add ALTER TABLE DROP COLUMN feature [drop] (Bruce)
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o Add ALTER FUNCTION
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o Add ALTER TABLE DROP non-CHECK CONSTRAINT
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o ALTER TABLE ADD PRIMARY KEY (Christopher Kings-Lynne)
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o ALTER TABLE ADD UNIQUE (Christopher Kings-Lynne)
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o ALTER TABLE ADD COLUMN column SERIAL doesn't create sequence
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o ALTER TABLE ADD COLUMN column SET DEFAULT should fill existing
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rows with DEFAULT value
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o Have ALTER TABLE OWNER change all dependant objects like indexes
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* CLUSTER
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o cluster all tables at once
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o prevent loss of indexes, permissions, inheritance (Bruce)
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o Automatically maintain clustering on a table
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* COPY
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o Allow specification of column names
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o Allow dump/load of CSV format
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o Change syntax to WITH DELIMITER, (keep old syntax around?)
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o Allow COPY to report error lines and continue; optionally
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allow error codes to be specified; requires savepoints or can
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not be run in a multi-statement transaction
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o Generate failure on short COPY lines rather than pad NULLs
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* CURSOR
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o Allow BINARY option to SELECT, just like DECLARE
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o MOVE 0 should not move to end of cursor
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o Allow cursors to be DECLAREd/OPENed/CLOSEed outside transactions
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o Allow UPDATE/DELETE WHERE CURRENT OF cursor using per-cursor tid
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stored in the backend
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o Prevent DROP of table being referenced by our own open cursor
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o Allow cursors outside transactions [cursor]
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* INSERT
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o Allow INSERT/UPDATE of system-generated oid value for a row
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o Allow INSERT INTO tab (col1, ..) VALUES (val1, ..), (val2, ..)
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o Allow INSERT INTO my_table VALUES (a, b, c, DEFAULT, x, y, z, ...)
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o Disallow missing columns in INSERT ... VALUES, per ANSI
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o Allow INSERT/UPDATE ... RETURNING new.col or old.col; handle
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RULE cases (Philip)
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* SHOW/SET
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o Add SHOW command to display locks
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o Add SET or BEGIN timeout parameter to cancel query
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o Add SET REAL_FORMAT and SET DOUBLE_PRECISION_FORMAT using printf args
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o Remove SET KSQO option now that OR processing is improved (Tom)
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o Add SET PERFORMANCE_TIPS option to suggest INDEX, VACUUM, VACUUM
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ANALYZE, and CLUSTER
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o Add SHOW command to see locale
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* SERVER-SIDE LANGUAGES
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o Allow PL/PgSQL's RAISE function to take expressions
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o Fix PL/PgSQL to handle quoted mixed-case identifiers
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o Change PL/PgSQL to use palloc() instead of malloc()
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o Add untrusted version of plpython
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o Add plsh server-side shell language (Peter E)
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o Allow Java server-side programming (?) [java]
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CLIENTS
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-------
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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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* -Have pg_dump -C dump database location and encoding information
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* Allow psql \d to show foreign keys
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* Allow psql \d to show temporary table structure
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* Allow psql to show transaction status if backend protocol changes made
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* Add XML interface: psql, pg_dump, COPY, separate server (?)
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* Add config file check for $ODBCINI, $HOME/.odbc.ini, installpath/etc/odbc.ini
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* Have pg_dump use ADD PRIMARY KEY after COPY, for performance (Neil Conway)
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* JDBC
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o Comprehensive test suite. This may be available already.
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o Updateable resultSet (must be done in backend code)
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o JDBC-standard BLOB support
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o Error Codes (pending backend implementation)
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o Support both 'make' and 'ant'
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o Fix LargeObject API to handle OIDs as unsigned ints
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o Implement cancel() method on Statement
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o Use cursors implicitly to avoid large results (see setCursorName())
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o Add support for CallableStatements
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o Add LISTEN/NOTIFY support to the JDBC driver (Barry)
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* ECPG
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o Implement set descriptor, using descriptor
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o Make casts work in variable initializations
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o Implement SQLDA
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o Solve cardinality > 1 for input descriptors / variables
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o Understand structure definitions outside a declare section
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o sqlwarn[6] should be 'W' if the PRECISION or SCALE value specified
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o Improve error handling
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o Allow :var[:index] or :var[<integer>] as cvariable for an array var
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o Add a semantic check level, e.g. check if a table really exists
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o Fix nested C comments
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o Add SQLSTATE
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o fix handling of DB attributes that are arrays
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* ODBC
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o ODBC 3.0 support
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o Unicode(UCS-2) support
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o Updatable cursors support
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REFERENTIAL INTEGRITY
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---------------------
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* Add MATCH PARTIAL referential integrity [foreign]
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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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* Make triggers refer to columns by number, not name
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* Enforce referential integrity for system tables
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* Allow user to control trigger firing order
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* Change foreign key constraint for array -> element to mean element
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in array
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* Fix foreign key constraints to not error on intermediate db states (Stephan)
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DEPENDENCY CHECKING
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-------------------
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* Add pg_depend table for dependency recording; use sysrelid, oid,
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depend_sysrelid, depend_oid, name
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* Auto-destroy sequence on DROP of table with SERIAL; perhaps a separate
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SERIAL type
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* Have SERIAL generate non-colliding sequence names when we have
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auto-destruction
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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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* Automatically drop constraints/functions when object is dropped
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* Make constraints clearer in dump file
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* Make foreign keys easier to identify
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* Flush cached query plans when their underlying catalog data changes
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TRANSACTIONS
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------------
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* Allow autocommit so always in a transaction block
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* Overhaul bufmgr/lockmgr/transaction manager
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* Allow savepoints / nested transactions [transactions]
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EXOTIC FEATURES
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---------------
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* Add sql3 recursive unions
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* Add the concept of dataspaces/tablespaces [tablespaces]
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* Allow SQL92 schemas [schema]
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* Allow queries across multiple databases [crossdb]
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* Add pre-parsing phase that converts non-ANSI features to supported features
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* Allow plug-in modules to emulate features from other databases
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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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PERFORMANCE
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===========
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FSYNC
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-----
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* Delay fsync() when other backends are about to commit too [fsync]
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o Determine optimal commit_delay value
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* Determine optimal fdatasync/fsync, O_SYNC/O_DSYNC options
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o Allow multiple blocks to be written to WAL with one write()
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CACHE
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-----
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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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* Add free-behind capability for large sequential scans (Bruce)
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* Allow binding query args over FE/BE protocol
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* Consider use of open/fcntl(O_DIRECT) to minimize OS caching
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* Make blind writes go through the file descriptor cache
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VACUUM
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------
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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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* Provide automatic scheduling of background vacuum (Tom)
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LOCKING
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-------
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* Make locking of shared data structures more fine-grained
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* Add code to detect an SMP machine and handle spinlocks accordingly
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from distributted.net, http://www1.distributed.net/source,
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in client/common/cpucheck.cpp
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* Research use of sched_yield() for spinlock acquisition failure
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STARTUP TIME
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------------
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* Experiment with multi-threaded backend [thread]
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* Add connection pooling [pool]
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* Allow persistent backends [persistent]
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* Create a transaction processor to aid in persistent connections and
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connection pooling
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* Do listen() in postmaster and accept() in pre-forked backend
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* Have pre-forked backend pre-connect to last requested database or pass
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file descriptor to backend pre-forked for matching database
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* -Cache system catalog information in per-database files (Tom)
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WRITE-AHEAD LOG
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---------------
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* Have after-change WAL write()'s write only modified data to kernel
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* Reduce number of after-change WAL writes; they exist only to gaurd against
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partial page writes
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* Turn off after-change writes if fsync is disabled (?)
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* Add WAL index reliability improvement to non-btree indexes
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* -Reorder postgresql.conf WAL items in order of importance (Bruce)
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* Remove wal_files postgresql.conf option because WAL files are now recycled
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* Find proper defaults for postgresql.conf WAL entries
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* Add checkpoint_min_warning postgresql.conf option to warn about checkpoints
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that are too frequent
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OPTIMIZER / EXECUTOR
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--------------------
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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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* Improve dynamic memory allocation by introducing tuple-context memory
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allocation (Tom)
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* Add hash for evaluating GROUP BY aggregates
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* Nested FULL OUTER JOINs don't work (Tom)
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* Allow merge and hash joins on expressions not just simple variables (Tom)
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* Add new pg_proc cachable settings to specify whether function can be
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evaluated only once or once per query
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* Change FIXED_CHAR_SEL to 0.20 from 0.04 to give better selectivity (Bruce)
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* Make IN/NOT IN have similar performance to EXISTS/NOT EXISTS [exists]
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* Missing optimizer selectivities for date, r-tree, etc. [optimizer]
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* Allow ORDER BY ... LIMIT to select top values without sort or index
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using a sequential scan for highest/lowest values
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* Inline simple SQL functions to avoid overhead (Tom)
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* Precompile SQL functions to avoid overhead (Neil Conway)
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MISCELLANEOUS
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-------------
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* Do async I/O for faster random 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 or to write WAL files (?) [mmap]
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* Improve caching of attribute offsets when NULLs exist in the row
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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 problems with libpq non-blocking/async code [async]
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* Make sure all block numbers are unsigned to increase maximum table size
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* Use BlockNumber rather than int where appropriate
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* Merge LockMethodCtl and LockMethodTable into one shared structure (Bruce)
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* HOLDER/HOLDERTAB rename to PROCLOCK/PROCLOCKTAG (Bruce)
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* Remove LockMethodTable.prio field, not used (Bruce)
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* Add version file format stamp to heap and other table types
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* Rename some /contrib modules from pg* to pg_*
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* Move some things from /contrib into main tree
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* Remove warnings created by -Wcast-align
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* Move platform-specific ps status display info from ps_status.c to ports
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* Make one version of simple_prompt() in code (Bruce, Tom)
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* Compile in syslog functionaility by default (?)
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* Modify regression tests to prevent failures do to minor numeric rounding
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* Remove USING clause from pg_get_indexdef() if index is btree (Bruce)
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* Use our own getopt() for FreeBSD/OpenBSD to allow --xxx flags (Bruce)
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* Add OpenBSD's getpeereid() call for local socket authentication (Bruce)
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* Improve access-permissions check on data directory in Cygwin (Tom)
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* Report failure to find readline or zlib at end of configure run
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* Add --port flag to regression tests
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* Increase identifier length (NAMEDATALEN) if small performance hit,
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perhaps to standard length of 128; change struct pgNotify to use pid
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first, breaks notify API; [namedatalen]
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* Increase maximum number of function parameters if little wasted space
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* Add documentation for perl, including mention of DBI/DBD perl location
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* Add optional CRC checksum to heap and index pages
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* Change representation of whole-tuple parameters to functions
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* Evaluate AIX cs() spinlock macro for performance optimizations (Tatsuo)
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* Clarify use of 'application' and 'command' tags in SGML docs
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* Better document ability to build only certain interfaces (Marc)
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* Remove or relicense modules that are not under the BSD license, if possible
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* Remove memory/file descriptor freeing befor elog(ERROR) (Bruce)
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---------------------------------------------------------------------------
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Developers who have claimed items are:
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--------------------------------------
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* Barry is Barry Lind <barry@xythos.com>
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* Billy is Billy G. Allie <Bill.Allie@mug.org>
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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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* Dave is Dave Cramer <dave@fastcrypt.com>
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* Edmund is Edmund Mergl <E.Mergl@bawue.de>
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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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* Liam is Liam Stewart <liams@redhat.com>
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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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* Marko is Marko Kreen <marko@l-t.ee>
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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 M is Peter T Mount <peter@retep.org.uk>
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* Peter E is Peter Eisentraut<peter_e@gmx.net>
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* Philip is Philip Warner <pjw@rhyme.com.au>
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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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* Thomas is Thomas Lockhart <lockhart@fourpalms.org>
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* Tom is Tom Lane <tgl@sss.pgh.pa.us>
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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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