Update HISTORY file for 7.4.
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HISTORY
348
HISTORY
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Release Notes
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Release Notes
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7.4 Development Branch
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7.4 Development Branch
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Below is a subset of the changes that have gone into the development
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branch of PostgreSQL since version 7.3. For a complete list of
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changes, consult the CVS logs.
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Explicit JOINs no longer constrain query plan, unless
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Valid as of 2003-08-01.
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JOIN_COLLAPSE_LIMIT = 1
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Performance of "foo IN (SELECT ...)" queries has been considerably
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improved
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Server Operation
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FETCH 0 now re-fetches cursor's current row, per SQL spec
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Revised executor state representation; plan trees are read-only
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Allow IPv6 server connections (Nigel Kukard, Johan Jordaan, Bruce, Tom, Kurt
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to executor now
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Roeckx, Andrew Dunstan)
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Information schema
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Fix SSL to handle errors cleanly (Nathan Mueller)
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Domains now support CHECK constraints
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SSL protocol security and performance improvements (Sean Chittenden)
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psql backslash commands for listing conversions, casts, and schemas
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Print lock information when a deadlock is detected (Tom)
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TRUNCATE TABLE is transaction-safe
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Update /tmp socket files regularly to avoid their removal (Tom)
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CLUSTER can re-cluster a previously clustered table, or all such tables
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Enable PAM for MAC OS X (Aaron Hillegass)
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Statement-level triggers
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Make btree indexes fully WAL-safe (Tom)
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System can use either hash- or sort-based strategy for grouped
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Allow btree index compaction and empty page reuse (Tom)
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aggregation
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Fix inconsistent index lookups during split of first root page (Tom)
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ON COMMIT options for temp tables
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Improve free space map allocation logic (Tom)
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extra_float_digits option allows pg_dump to dump float data accurately
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Preserve free space information between postmaster restarts (Tom)
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Long options for psql and pg_dump are now available on all platforms
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Set proper schema permissions in initdb (Peter)
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Read-only transactions
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Add start time to pg_stat_activity (Neil)
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Object owners can allow grantees to grant the privilege to others
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New code to detect corrupt disk pages; erase with zero_damaged_pages (Tom)
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(grant option)
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New client/server protocol: faster, no username length limit, allow
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clean exit
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Add transaction status, tableid, columnid to backend protocol (Tom)
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Add new binary I/O protocol (Tom)
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Remove autocommit server setting; move to client applications (Tom)
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New error message wording, error codes, and three levels of error detail (Tom)
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_________________________________________________________________
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Performance
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Add hashing for GROUP BY aggregates (Tom)
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Allow nested loops to be smarter about multicolumn indexes (Tom)
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Allow multi-key hash joins (Tom)
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Improve constant folding (Tom)
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Add ability to inline simple SQL functions (Tom)
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Reduce memory usage for queries using complex functions (Tom)
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Improve GEQO optimizer performance (Tom)
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Allow IN/NOT IN to be handled via hash tables (Tom)
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Improve NOT IN (subquery) performance (Tom)
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Allow most IN subqueries to be processed as joins (Tom)
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Improve reverse index scan performance (Tom)
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Improve optimizer cost computations, particularly for subqueries (Tom)
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Assume WHERE a.x = b.y and b.y = 42 also means a.x = 42 (Tom)
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Allow hash/merge joins on complex joins (Tom)
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Allow hash joins for more data types (Tom)
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Allow join optimization of ANSI joins, disable with join_collapse_limit (Tom)
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Add from_collapse_limit to control conversion of subqueries to joins (Tom)
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Use faster regex code from TCL (Henry Spencer, Tom)
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Use bit-mapped relation sets in the optimizer (Tom)
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Improve backend startup time (Tom)
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Improve trigger/constraint performance (Stephan)
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_________________________________________________________________
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Server Configuration
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Rename server parameter server_min_messages to log_min_messages (Bruce)
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Rename show_*_stats to log_*_stats (Bruce)
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Rename show_source_port to log_source_port (Bruce)
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Rename hostname_lookup to log_hostname (Bruce)
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Add checkpoint_warning to warn of excessive checkpointing (Bruce)
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Allow the postmaster to preload libraries using preload_libraries (Joe)
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New read-only server parameters for localization (Tom)
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Change debug server log messages to output as DEBUG rather than LOG (Bruce)
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Prevent server log variables from being turned off by non-super users (Bruce)
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log_min_messages/client_min_messages now controls debug_* output (Bruce)
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Add Rendezvous server support (Chris Campbell)
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Add ability to print only slow statements using log_min_duration_statement
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(Christopher)
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Allow pg_hba.conf to accept netmasks in CIDR format (Andrew Dunstan)
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New is_superuser read-only variable (Tom)
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New server-side parameter log_error_verbosity to control error detail (Tom)
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postgres --help-config now dumps server config variables (Tom)
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Make default shared_buffers 1000 and max_connections 100, if possible (Tom)
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Add pg_settings table to see server settings (Joe)
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Prevent assign_session_authorization() from being confused by
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all-numeric user names (Tom)
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_________________________________________________________________
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Queries
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New SQL-standard information schema (Peter)
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Add read-only transactions (Peter)
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Add server variable regex_flavor to control regular expression
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processing (Tom)
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Allow ORDER BY in FROM subqueries to be honored by outer queries (Tom)
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Print key name in foreign-key violation messages (Dmitry Tkach)
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Allow users to see their own queries in pg_stat_activity (Kevin Brown)
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Allow subquery aggregates to reference upper query columns (?) (Tom)
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Add option to prevent auto-addition of tables referenced in query (Nigel J.
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Andrews)
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Allow dollar signs in identifiers, except as first character (Tom)
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Allow UPDATE ... SET col = DEFAULT (Rod)
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Allow expressions to be used in LIMIT/OFFSET (Tom)
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_________________________________________________________________
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Object Manipulation
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Make CREATE SEQUENCE grammar more SQL1999 standards compliant (Neil)
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Add FOR EACH STATEMENT statement-level triggers (Neil Conway)
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Add DOMAIN CHECK constraints (Rod)
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Add ALTER DOMAIN .. SET / DROP NOT NULL, SET / DROP DEFAULT, ADD / DROP
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CONSTRAINT (Rod)
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Allow zero-column tables (Tom)
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Have ALTER TABLE ... ADD PRIMARY KEY add NOT NULL constraint (Rod)
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Add ALTER DOMAIN OWNER (Rod)
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Add pg_trigger.tgenabled to disable triggers? (Neil)
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Add ALTER TABLE ... WITHOUT OIDS? (Rod)
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Have parser honor foreign-key constraints if created via ALTER TABLE ADD
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COLUMN? (Tom)
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Add ALTER SEQUENCE to modify min/max/increment/cache/cycle values (Rod)
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Add ALTER TABLE ... CLUSTER ON (Alvaro Herrera)
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Improve DOMAIN automatic type casting (Tom)
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Disallow dollar signs in operator names (Tom)
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Allow SQL200X inheritance syntax LIKE <subtable>, INCLUDING DEFAULTS? (Rod)
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Object owners can allow grantees to grant privilege to others?
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_________________________________________________________________
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Utility Commands
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Add ON COMMIT PRESERVE ROWS for temp tables (Gavin)
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Allow cursors outside transactions using WITH HOLD (Neil)
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Make MOVE/FETCH 0 actually move/fetch 0 (Bruce)
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Add MOVE ALL to move to end of cursor (Bruce)
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Cause FETCH 1 to return the current cursor row, or zero if at
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beginning/end of cursor, per SQL spec (Bruce)
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Have MOVE return 0 or 1 depending on cursor position (Bruce)
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Properly handle SCROLL with cursors, or report an error (Tom)
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Implement SQL92-compatible FIRST, LAST, ABSOLUTE n, RELATIVE n options
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for FETCH and MOVE (Tom)
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Allow EXPLAIN on DECLARE CURSOR (Tom)
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Allow CLUSTER to use index marked as pre-clustered by default (Alvaro Herrera)
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Allow CLUSTER without tablename clusters all tables (Alvaro Herrera)
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Prevent CLUSTER on partial indexes (Tom)
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Allow \r and \r\n termination for COPY files (Bruce)
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Disallow literal carriage return as a data value, backslash-carriage-return
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and \r still allowed (Bruce)
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COPY changes (binary, \.)? (Tom)
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Recover from COPY IN/OUT failure cleanly (Tom)
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Reduce memory used by COPY (Tom)
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Make TRUNCATE transaction-safe (Rod)
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Multiple pg_dump fixes, including tar format and large objects
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Allow pg_dump to dump specific schemas (Neil)
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Allow pg_dump to preserve column storage characteristics (Christopher)
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Allow pg_dump to preserve CLUSTER characteristics (Christopher)
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Have pg_dumpall use GRANT/REVOKE to dump database-level permissions (Tom)
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Allow pg_dumpall to support the -a, -s, -x options of pg_dump (Tom)
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Prevent pg_dump from lowercasing identifiers specified on the command line (Tom)
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Allow EXPLAIN EXECUTE (Neil)
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Allow pg_get_constraintdef() to support UNIQUE, PRIMARY KEY and
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CHECK constraints (Christopher)
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Improve VACUUM performance on indexes by reducing WAL traffic (Tom)
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Allow pg_ctl to better handle non-standard ports (Greg)
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Functional indexes now support indexes on column expressions (Tom)
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Syntax errors now reported as 'syntax error' rather than 'parse error' (Tom)
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Have SHOW TRANSACTION_ISOLATION match input to SET TRANSACTION_ISOLATION (Tom)
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Have COMMENT ON DATABASE on non-local database generate a warning (Tom)
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_________________________________________________________________
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Data Types and Functions
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New extra_float_digits server parameter to control float precision display
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(Pedro Ferreira, Tom)
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Allow +1300 as a numeric timezone specifier, for FJST (Tom)
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Remove rarely used oidrand(), oidsrand(), and userfntest() functions (Neil)
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Add md5() function to main server, already in /contrib/pgcrypto (Joe)
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Increase date range of timestamp (John Cochran)
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Change EXTRACT(EPOCH FROM timestamp) so timestamp without time zone
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is assumed to be in local time, not GMT (Tom)
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Trap division by zero in case the operating system doesn't prevent it (Tom)
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Change the NUMERIC data type internally to base 10000 (Tom)
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New hostmast() function (Greg Wickham)
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Fixes for to_char() (Karel)
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Allow functions that can take any argument data type and return
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any data type, using ANYELEMENT and ANYARRAY (Joe)
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Arrays may now be specified as ARRAY[1,2,3], ARRAY[['a','b'],['c','d']],
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or ARRAY[ARRAY[ARRAY[2]]] (Joe)
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Allow proper comparisons for arrays (Joe)
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Allow indexes on array columns, and used in ORDER BY and DISTINCT (Joe)
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Allow WHERE qualifications of the form 'col IN/ANY/SOME/ALL (array) (?) (Joe)
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Allow SQL functions to return arrays and take them as params (Joe)
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Allow array concatenation with '||' and normal array comparisons (Joe)
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New array functions array_append(), array_cat(), array_lower(),
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array_prepend(), array_to_string(), array_upper(), string_to_array() (Joe)
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Allow assignments to empty arrays (Joe)
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Allow 60 in seconds fields of timestamp, time, interval input values (Tom)
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Allow PREPARE/bind of utility commands like FETCH and EXPLAIN (Tom)
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Allow CIDR data type to be cast to text (Tom)
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Allow the creation of special LIKE indexes for non-C locales (Peter)
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Disallow invalid timezone names (Tom)
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Trim trailing spaces when CHAR() data is cast to VARCHAR or TEXT (Tom)
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Make FLOAT(p) measure the precision p in bits, not decimal digits (Tom)
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Add IPv6 support to the inet and cidr data types (Michael Graff)
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Add family() function to report whether address is IPv4 or IPv6 (Michael Graff)
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Have SHOW DATESTYLE generate output similar to that used by SET DATESTYLE (Tom)
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Change DATESTYLE to output its value in a more common format (Tom)
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Make EXTRACT(TIMEZONE) and SET/SHOW TIMEZONE follow the SQL convention
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for the sign of timezone offsets, ie, positive is east from UTC (Tom)
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Fix date_trunc('quarter',...) (B?jthe Zolt?n)
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Make initcap() more compatible with Oracle (Mike Nolan)
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Honor only DateStyle setting for date entry without a four-digit year (Greg)
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Add new DateStyle values MDY, DMY, and YMD, honor US and European for
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backward compatibility (Tom)
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'now' will no longer work as a default, use now() (change required for prepared
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statements) (Tom)
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Assume NaN value to be larger than any other value in comparisons (Tom)
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_________________________________________________________________
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Server-side Languages
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Prevent PL/pgSQL crash when RETURN NEXT is used on a zero-row record (Tom)
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Make PL/python's spi_execute interface handle NULLs properly (Andrew Bosma)
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Allow PL/pgSQL to declare variables of composite types without %ROWTYPE (Tom)
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Fix PL/python _quote() function to handle big integers (?)
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Make PL/python an untrusted language, now called plpythonu (Kevin Jacobs, Tom)
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Change PL/pgSQL EXECUTE INTO to CREATE TABLE AS EXECUTE? (Peter)
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_________________________________________________________________
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Psql
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Add "\pset pager always" to always use pager (Greg)
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Improve tab completion (Rod, Ross Reedstrom, Ian Barwick)
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Reorder \? help into groupings (Harald Armin Massa, Bruce)
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Add schema, cast, and conversion backslash commands (Christopher)
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\encoding now tracks client_encoding server variable (Tom)
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Save edit history into readline history (Ross)
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Improve \d display (Christopher)
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Enhance HTML mode to be more standards-compliant (Greg)
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New '\set autocommit off' capability (Tom)
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New '\set verbosity' to control error detail (Tom)
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New %T prompt string to show transaction status (Tom)
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_________________________________________________________________
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Libpq
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Allow PQcmdTuples() to return row counts for MOVE and FETCH (Neil)
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Add PQfreemem() for freeing memory on Win32, suggest for NOTIFY (Bruce)
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Document service capability, and add sample file (Bruce)
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Make PQsetdbLogin() have the same defaults as PQconnectdb() (Tom)
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Allow libpq to cleanly fail when result sets are too large (Tom)
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Improve performance of PGunescapeBytea() (Ben Lamb)
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Allow threaded with --enable-thread-safety (Lee Kindness, Bruce)
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Allow pqInternalNotice() to accept a format string and args instead of
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just a preformatted message (Tom, Sean Chittenden)
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Allow control SSL negotiation with sslmode values "disable", "allow",
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"Prefer", and "require" (Jon Jensen)
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_________________________________________________________________
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JDBC
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Allow setNull on updateable resultsets
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Allow executeBatch on a prepared statement (Barry)
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Support SSL connections (Barry)
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Handle schema names in result sets (Paul Sorenson)
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Add refcursor support (Nic Ferrier)
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_________________________________________________________________
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Miscellaneous Interfaces
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Prevent possible memory leak or core dump during libpgtcl shutdown (Tom)
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Add ecpg Informix compatibility (Michael)
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Add ecpg DECIMAL type that is fixed length, for Informix (Michael)
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Allow threaded ecpg with --enable-thread-safety (Lee Kindness, Bruce)
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Allow client interfaces to compile under MinGW/win32 (Bruce)
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Move python client interface to http://www.pygresql.org (Marc)
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_________________________________________________________________
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Source Code
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Prevent need for separate platform geometry regression result files (Tom)
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Improved PPC locking primitive (Reinhard Max)
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Embed LD_LIBRARY_PATH used for build process into binaries (Billy)
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New palloc0 to allocate and clear memory (Bruce)
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Fix locking code for s390x CPU (64-bit) (Tom)
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Allow OpenBSD to use local indent credentials (William Ahern)
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Allow read-only query plans (Tom)
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Add Darwin startup scripts (David Wheeler)
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Allow libpq to compile with Borland C++ compiler (Lester Godwin, Karl Waclawek)
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Use our own version of getopt_long() if needed (Peter)
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Convert administration scripts to C (Peter)
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Bison >=1.85 is now required for grammar changes
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Merge documentation into one book (Peter)
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Add Win32 compatibility functions (Bruce)
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New ereport() function for error reporting (Tom)
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Support Intel Linux compiler (Peter)
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Improve Linux startup scripts (Slawomir Sudnik, Darko Prenosil)
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Add support for AMD Opteron and Itanium (Jeffrey W. Baker, Bruce)
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_________________________________________________________________
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Contrib
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Change dbmirror license to BSD
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Improve earthdistance (Bruno Wolff III)
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Portability improvements to pgcrypto (Marko Kreen)
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Prevent xml crash (John Gray, Michael Richards)
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Upgrade oracle
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Upgrade mysql
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Update cube (Bruno Wolff III)
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Update earthdistance to use cube (Bruno Wolff III)
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Update btree_gist (Oleg)
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Add hashes to tablefuncs (Joe)
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New pg_autovacuum allows automatic VACUUM (Matthew T. O'Connor)
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Allow pgbench to honor PGHOST, PGPORT, PGUSER env. variables (Tatsuo)
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Improve intarray (Teodor Sigaev)
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Improve pgstattuple (Rod)
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Fix second argument to metaphone() in fullystrmatch
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Add named persistent connections to dblink (Shridhar Daithanka)
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Improve adddepend (Rod)
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Update spi/timetravel (B?jthe Zolt?n)
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Fix dbase -s option (Thomas Behr)
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_________________________________________________________________
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Release 7.3.3
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Release 7.3.3
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