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@ -1,13 +1,13 @@ |
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TODO list for PostgreSQL |
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======================== |
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Last updated: Sat Nov 2 00:41:54 EST 2002 |
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Last updated: Tue Nov 12 21:10:17 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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A dash (-) marks changes that will appear in the upcoming 7.4 release. |
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Bracketed items "[]" have more detailed. |
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@ -35,39 +35,19 @@ Reporting |
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number, not just messages (Peter E) |
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* Add error codes (Peter E) |
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* Make error messages more consistent [error] |
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* -Change DEBUG startup tag to LOG (Bruce) |
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* Show location of syntax error in query [yacc] |
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* -Add pg_backend_pid() function to backend |
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* -Allow logging of query durations |
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Permissions |
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=========== |
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* -Improve control over user privileges, including table creation |
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* -Allow user/group names to be specified directly in pg_hba.conf (Bruce) |
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* -Add ~/.pgpass to store passwords with user/host/password combinations |
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* -Allow permissions for functions (Peter E) |
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* -Allow object creation to be disabled for specific users |
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Administration |
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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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* Remove behavior of postmaster -o after making postmaster/postgres |
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flags unique |
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* -Prevent SIGHUP and 'pg_ctl reload' from changing command line |
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specified parameters to postgresql.conf defaults (Peter E) |
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* Allow easy display of usernames in a group |
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* Allow configuration files to be specified in a different directory |
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* -Reserve last few process slots for super-user if max_connections reached |
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* -Add GUC parameter to print queries that generate errors |
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* Add start time to pg_stat_activity |
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* Allow limits on per-db/user connections |
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* Have standalone backend read postgresql.conf |
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@ -76,32 +56,23 @@ Administration |
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Data Types |
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========== |
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* -Add domain capability (Rod Taylor) |
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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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* Change NUMERIC data type to use base 10,000 internally |
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* Change NUMERIC to enforce the maximum precision, and increase it |
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* Add function to return compressed length of TOAST data values (Tom) |
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* -Add GUC parameter for DATESTYLE |
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* Allow INET subnet tests using non-constants |
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* -Allow bytea to handle LIKE with non-TEXT patterns |
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* -to_char(0,'FM999.99') returns a period, to_char(1,'FM999.99') doesn't (Karel) |
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* -Add floor(float8) and other missing functions |
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* Add now("transaction|statement|clock") functionality |
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* -Add GUC variables to control floating number output digits (Pedro Ferreira) |
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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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* 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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@ -136,8 +107,6 @@ Views / Rules |
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* Have views on temporary tables exist in the temporary namespace |
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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 (Bruce) |
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* -Prevent aggregates from being used in rule WHERE clauses |
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Indexes |
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@ -151,7 +120,6 @@ Indexes |
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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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* 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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@ -163,7 +131,6 @@ Indexes |
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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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* Use bitmaps to fetch heap pages in sequential order [performance] |
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* Use bitmaps to combine existing indexes [performance] |
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@ -173,21 +140,15 @@ Indexes |
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* Add FILLFACTOR to btree index creation |
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* Add concurrency to GIST |
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* Improve concurrency of hash indexes (Neil) |
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* -Test hash index performance and 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 (Christopher) |
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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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* Allow backslash handling in quoted strings to be disabled for portability |
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* Return proper effected tuple count from complex commands [return] |
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@ -195,42 +156,32 @@ Commands |
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* Add CORRESPONDING BY to UNION/INTERSECT/EXCEPT |
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* Allow REINDEX to rebuild all indexes, remove /contrib/reindex |
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* Make a transaction-safe TRUNCATE |
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* Fix SELECT ... INTO and CREATE TABLE AS to have appopriate OID column |
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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 -Add ALTER TABLE DROP COLUMN feature |
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o -Add ALTER TABLE DROP non-CHECK CONSTRAINT |
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o -ALTER TABLE ADD PRIMARY KEY (Tom) |
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o -ALTER TABLE ADD UNIQUE (Tom) |
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o -ALTER TABLE ALTER COLUMN SET/DROP NOT NULL (Christopher) |
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o ALTER TABLE ADD COLUMN column DEFAULT should fill existing |
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rows with DEFAULT value |
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o ALTER TABLE ADD COLUMN column SERIAL doesn't create sequence because |
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of the item above |
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o -Have ALTER TABLE OWNER change all dependant objects like indexes |
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o Add ALTER TABLE tab SET WITHOUT OIDS |
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* CLUSTER |
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o -Cluster all tables at once using pg_index.indisclustered set during |
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previous CLUSTER |
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o -Prevent loss of indexes, permissions, inheritance |
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o Automatically maintain clustering on a table |
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o Allow CLUSTER to cluster all tables, remove clusterdb |
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* COPY |
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o -Allow specification of column names |
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o Allow psql \copy to specify 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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o Allow copy to understand \x as hex |
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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 (Bruce) |
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o -MOVE 0 should not move to end of cursor (Bruce) |
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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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@ -239,21 +190,13 @@ Commands |
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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 ... (col) 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 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 (Bruce) |
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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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o -Allow SHOW to output as a query result, like EXPLAIN |
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o -Abort all SET changes made in an aborted transaction |
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o Add SET SCHEMA |
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o Allow EXPLAIN EXECUTE to see prepared plans |
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o Allow SHOW of non-modifiable variables, like pg_controldata |
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@ -261,7 +204,6 @@ Commands |
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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 Allow Java server-side programming, http://pljava.sourceforge.net |
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@ -284,14 +226,8 @@ Commands |
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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 (Tom) |
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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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* -Have pg_dump use ADD PRIMARY KEY after COPY, for performance (Neil) |
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* Add schema, cast, and conversion backslash commands to psql |
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* Allow pg_dump to dump a specific schema |
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* Allow psql to do table completion for SELECT * FROM schema_part and |
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@ -299,16 +235,12 @@ Clients |
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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 |
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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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o -Compile under jdk 1.4 |
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* ECPG |
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o Implement set descriptor, using descriptor |
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@ -331,14 +263,10 @@ Referential Integrity |
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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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* Enforce referential integrity for system tables |
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* -Allow user to control trigger firing order (Tom) |
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* -Add ALTER TRIGGER ... RENAME |
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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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* Allow DEFERRABLE UNIQUE constraints |
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* Allow triggers to be disabled [trigger] |
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* Support statement-level triggers and triggers on columns (Neil) |
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@ -347,16 +275,6 @@ Referential Integrity |
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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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* -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 foreign key constraints clearer in dump file |
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* -Make other 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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* Use dependency information to dump data in proper order |
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@ -364,7 +282,6 @@ Dependency Checking |
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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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@ -374,7 +291,6 @@ 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 SQL92 schemas (Tom) |
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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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@ -397,7 +313,6 @@ Fsync |
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Cache |
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===== |
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* -Cache most recent query plan(s) (Neil) [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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@ -436,7 +351,6 @@ Startup Time |
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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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@ -447,8 +361,6 @@ Write-Ahead Log |
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partial page writes [wal] |
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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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@ -462,14 +374,8 @@ Optimizer / Executor |
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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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* Add hash for evaluating GROUP BY aggregates (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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@ -491,33 +397,20 @@ Miscellaneous |
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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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* -Add Intimate Shared Memory(ISM) for Solaris |
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* -Use faster flex flags for performance improvement (Peter E) |
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* -Add BSD-licensed qsort() for Solaris |
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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 |
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* -Make sure all block numbers are unsigned to increase maximum table size |
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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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* 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 (Tatsuo) |
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* Modify regression tests to prevent failures do to minor numeric rounding |
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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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* -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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@ -526,9 +419,8 @@ Source Code |
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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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* Create native Win32 port [win32] |
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* -Fix glibc's mktime() to handle pre-1970's dates |
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* -Move /contrib/retep to gborg.postgresql.org |
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* Acquire lock on a relation before building a relcache entry for it |
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* Research interaction of setitimer() and sleep() used by statement_timeout |
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--------------------------------------------------------------------------- |
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Bruce Momjian
23 years ago