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Update HISTORY.
This commit is contained in:
Bruce Momjian
parent
d6ad5375cb
commit
88a7576897
191
HISTORY
191
HISTORY
@ -8,12 +8,11 @@
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Major changes in this release:
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* IN/NOT IN subqueries are now much more efficient
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Note: In previous releases, IN/NOT IN subqueries were joined to the
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upper query by sequentially scanning the subquery looking for a
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join. The 7.4 code uses the same sophisticated techniques used by
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ordinary joins and so is much faster, and is now faster than EXISTS
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subqueries.
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In previous releases, IN/NOT IN subqueries were joined to the
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upper query by sequentially scanning the subquery looking for a
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join. The 7.4 code uses the same sophisticated techniques used by
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ordinary joins and so is much faster, and is now faster than
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EXISTS subqueries.
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* Improved GROUP BY processing by using hash buckets
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Note: In previous releases, GROUP BY totals were accumulated by
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@ -353,6 +352,8 @@
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Query Changes
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* New SQL-standard information schema (Peter)
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Note: bjm
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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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@ -360,52 +361,121 @@
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Tkach)
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* Allow users to see their own queries in pg_stat_activity (Kevin
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Brown)
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Note: In prior releases, only the super-user could see query
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strings using pg_stat_activity. Now ordinary users can see their
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own query strings.
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* Fix subquery aggregates of upper query columns to match SQL spec.
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(Tom)
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Note: bjm
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* Add option to prevent auto-addition of tables referenced in query
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(Nigel J. Andrews)
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Note: By default, tables mentioned in the query are automatically
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added to the FROM clause if they are not already there. This option
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disabled that behavior.
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* Allow UPDATE ... SET col = DEFAULT (Rod)
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Note: This allows UPDATE to set a column to its default value.
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* Allow expressions to be used in LIMIT/OFFSET (Tom)
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Note: In prior releases, LIMIT/OFFSET could only use constants, not
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expressions.
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* Change EXECUTE INTO to CREATE TABLE AS EXECUTE (Peter)
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Note: bjm ?
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_________________________________________________________________
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Object Manipulation Changes
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* Make CREATE SEQUENCE grammar more SQL1999 standards compliant
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(Neil)
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Note: bjm ?
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* Add FOR EACH STATEMENT statement-level triggers (Neil)
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Note: While this allows a trigger to fire at the end of a
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statement, it does not allow the trigger to access all rows
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modified by the query. This capability is planned for a future
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release.
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* Add DOMAIN CHECK constraints (Rod)
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Note: This greatly increases the usefulness of domains by allowing
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them to use CHECK constraints.
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* Add ALTER DOMAIN .. SET / DROP NOT NULL, SET / DROP DEFAULT, ADD /
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DROP CONSTRAINT (Rod)
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Note: This allows manipulation of existing domains.
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* Fix several zero-column table bugs (Tom)
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Note: PostgreSQL supports zero-column tables. This fixes various
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bugs that occur when using such tables.
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* Have ALTER TABLE ... ADD PRIMARY KEY add NOT NULL constraint (Rod)
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Note: In prior releases, ALTER TABLE ADD PRIMARY would add a unique
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index, but not a NOT NULL constraint. That is fixed in this
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release.
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* Add ALTER DOMAIN OWNER (Rod)
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* Add ALTER TABLE ... WITHOUT OIDS (Rod)
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Note: This allows control over whether new and updated rows will
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have an oid column. This is most useful for saving storage space.
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* Add ALTER SEQUENCE to modify min/max/increment/cache/cycle values
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(Rod)
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* Add ALTER TABLE ... CLUSTER ON (Alvaro Herrera)
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Note: This command is used by pg_dump to record the CLUSTER column
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for each table previously clustered. This information is used by
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database-wide cluster to cluster all previously clustered tables.
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* Improve DOMAIN automatic type casting (Rod, Tom)
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* Allow dollar signs in identifiers, except as first character (Tom)
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* Disallow dollar signs in operator names, so x=$1 works (Tom)
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* Allow SQL200X inheritance syntax LIKE *subtable*, INCLUDING
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DEFAULTS (Rod)
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* Add WITH GRANT OPTION clause to GRANT, per SQL spec (Peter)
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Note: Allow GRANT to give other users the ability to grant
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permissions on a object.
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_________________________________________________________________
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Utility Command Changes
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* Add ON COMMIT clause to CREATE TABLE for temp tables (Gavin)
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Note: This adds the ability for a table to be dropped or all rows
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deleted on transaction commit.
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* Allow cursors outside transactions using WITH HOLD (Neil)
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Note: In previous releases, cursors were removed at the end of the
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transaction. Using WITH HOLD, the current release allows
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transaction to remain outside their own transaction.
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* MOVE/FETCH 0 now does nothing (Bruce)
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Note: In previous releases, MOVE 0 moved to the end of the cursor,
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and FETCH 0 fetched all remaning rows.
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* Cause MOVE/FETCH to return the number of rows moved/fetched, or
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zero if at the beginning/end of cursor, per SQL spec (Bruce)
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Note: In prior releases, the row count returned by MOVE and FETCH
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did not accurately reflect the number of rows processed.
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* Properly handle SCROLL with cursors, or report an error (Neil)
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Note: Certain cursors can not be fetched backwards optimally. By
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specifying SCROLL, extra work will be performed to guarantee that
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the cursor can be fetched in reverse or random order.
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* Implement SQL92-compatible FIRST, LAST, ABSOLUTE n, RELATIVE n
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options for FETCH and MOVE (Tom)
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* Allow EXPLAIN on DECLARE CURSOR (Tom)
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Note: Prior versions would not allow EXPLAIN on a DECLARE
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statement.
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* Allow CLUSTER to use index marked as pre-clustered by default
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(Alvaro Herrera)
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* Allow CLUSTER to cluster all tables (Alvaro Herrera)
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Note: This allows all previously clustered tables in a database to
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be reclustered with a single command.
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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,
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@ -414,10 +484,15 @@
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* Recover from COPY IN/OUT failure cleanly (Tom)
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* Prevent possible memory leaks in 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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Note: Truncate can now be used inside a transaction, and rolled
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back if the transaction aborts.
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* Multiple pggla_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
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(Christopher)
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Note: This preserves ALTER TABLE ... SET STORAGE information.
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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
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permissions (Tom)
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@ -435,30 +510,56 @@
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* Allow pg_ctl to better handle non-standard ports (Greg)
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* Functional indexes have been generalized into expressional indexes
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(Tom)
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Note: In prior releases, only columns could be used in functional
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indexes. This release allows any type of expression.
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* Syntax errors now reported as 'syntax error' rather than 'parse
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error' (Tom)
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* Have SHOW TRANSACTION_ISOLATION match input to SET
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TRANSACTION_ISOLATION (Tom)
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* Have COMMENT ON DATABASE on non-local database generate a warning
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(Rod)
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Note: Database comments are stored in database-local tables so
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comments on a database have to be stored in each database.
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* Improve reliability of LISTEN/NOTIFY (Tom)
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* Allow REINDEX to reliably reindex non-shared system catalog
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indexes (Tom)
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Note: This allows system tables to be reindexed without the
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requirement of a standalone backend, which was necessary in
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previous releases. The only tables that now require a standalone
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backend for reindex are the global system tables pg_database,
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pg_shadow, and pg_group.
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* pg_dump --use-set-session-authorization and --no-reconnect now do
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nothing, all dumps use SET SESSION AUTHORIZATION
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Note: pg_dump now no longer reconnects to switch users, but instead
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uses SET SESSION AUTHORIZATION. This should reduce password
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prompting during restores.
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* Long options for pg_dump are now available on all platforms
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Note: We now include our own long option processing routines.
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_________________________________________________________________
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Data Type and Function Changes
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* New extra_float_digits server parameter to control float precision
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display (Pedro Ferreira, Tom)
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Note: This controls precision output which was causing regression
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testing problems.
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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()
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functions (Neil)
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* Add md5() function to main server, already in /contrib/pgcrypto
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(Joe)
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Note: An md5 function was frequently requested. For more complex
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encryption capabilities, use /contrib/pgcrypto.
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* Increase date range of timestamp (John Cochran)
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Note: bjm ??
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* Change EXTRACT(EPOCH FROM timestamp) so timestamp without time
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zone 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
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@ -468,6 +569,9 @@
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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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Note: This allows the creation of functions that can work with any
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data type.
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* Arrays may now be specified as ARRAY[1,2,3],
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ARRAY[['a','b'],['c','d']], or ARRAY[ARRAY[ARRAY[2]]] (Joe)
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* Allow proper comparisons for arrays (Joe)
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@ -476,18 +580,31 @@
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(Joe)
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* Allow WHERE qualification 'expr >oper< ANY/SOME/ALL (array-expr)'
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(Joe)
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Note: This allows arrays to behave like subqueries or a list of
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values: SELECT * FROM tab WHERE col IN array_val
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* Allow polymorphic SQL functions (Joe)
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Note: bjm ??
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* New array functions array_append(), array_cat(), array_lower(),
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array_prepend(), array_to_string(), array_upper(),
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string_to_array() (Joe)
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* Allow user defined aggregates to use polymorphic functions (Joe)
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Note: bjm ??
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* Allow polymorphic user defined aggregates (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
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values (Tom)
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Note: Sixty-second values are needed for leap seconds.
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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
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(Peter)
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Note: There is no way for non-ASCII locales to use indexes for LIKE
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comparisons. However, this release adds a way to create a special
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index for LIKE. bjm ??
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* Disallow invalid timezone names (Tom)
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* Trim trailing spaces when CHAR() is cast to VARCHAR or TEXT (Tom)
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* Make FLOAT(p) measure the precision p in bits, not decimal digits
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@ -501,10 +618,15 @@
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convention for the sign of timezone offsets, ie, positive is east
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from UTC (Tom)
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* Fix date_trunc('quarter',...) (B?jthe Zolt?n)
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Note: Prior releases returned an incorrect value for this function
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call.
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* Make initcap() more compatible with Oracle (Mike Nolan)
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Note: bjm ??
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* Allow only DateStyle field order for date values not in ISO format
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(Greg)
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* Add new DateStyle values MDY, DMY, and YMD, honor US and European
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* Add new DateStyle values MDY, DMY, and YMD; honor US and European
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for backward compatibility (Tom)
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* 'now' will no longer work as a column default, use now() (change
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required for prepared statements) (Tom)
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@ -519,7 +641,7 @@
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Server-side Language Changes
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* Prevent PL/pgSQL crash when RETURN NEXT is used on a zero-row
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record var. (Tom)
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record variable (Tom)
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* Make PL/python's spi_execute interface handle NULLs properly
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(Andrew Bosma)
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* Allow PL/pgSQL to declare variables of composite types without
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@ -527,6 +649,11 @@
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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
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Jacobs, Tom)
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Note: The Python language no longer supports a restricted execution
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environment, so we removed the trusted version of PL/python. If
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this situation changes, we will re-add a version of PL/python that
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can be used by non-super users.
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* Allow polymorphic PL/pgSQL functions (Tom, Joe)
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* Improved compiled function caching mechanism in PL/pgSQL with full
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support for polymorphism (Joe)
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@ -541,17 +668,32 @@
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Psql Changes
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* Add "\pset pager always" to always use pager (Greg)
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Note: This forces the pager to be used even if the number of rows
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is less than the screen height --- this is valuable for rows that
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wrap across several screen rows.
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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 backslash commands for listing schemas, casts, and conversions
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(Christopher)
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* \encoding now changes based on client_encoding server variable
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* \encoding now changes based on the client_encoding server variable
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(Tom)
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Note: In previous versions, \encoding was not aware of encoding
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changes made using SET CLIENT_ENCODING.
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* Save edit history into readline history (Ross)
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Note: When \e is used to edit a query, the result is saved in the
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readline history for retrieval using the up arrow.
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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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Note: This takes the place of the remove server variable
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'autocommit'.
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* New '\set VERBOSITY' to control error detail (Tom)
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Note: This controls the new error reporting details.
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* New %T prompt string to show transaction status (Tom)
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* Long options for psql are now available on all platforms
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_________________________________________________________________
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@ -561,7 +703,16 @@
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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
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(Bruce)
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Note: Win32 requires that memory allocated in a library be freed by
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a function in the same library, hence free() doesn't work for
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freeing memory allocated by libpq. PQfreemem() is the proper way to
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free libpq memory, especially on Win32, and is recommended for
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other platforms as well.
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* Document service capability, and add sample file (Bruce)
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Note: This allows clients to look up connection information in a
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central file on the client machine.
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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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@ -570,10 +721,14 @@
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* Allow pqInternalNotice() to accept a format string and args
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instead of just a preformatted message (Tom, Sean Chittenden)
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* Allow control SSL negotiation with sslmode values "disable",
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"allow", "Prefer", and "require" (Jon Jensen)
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"allow", "prefer", and "require" (Jon Jensen)
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* Allow new error codes and levels of text (Tom)
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* Allow access to the underlying table and column of a query result
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(Tom)
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Note: This is helpful for query-builder applications that want to
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know the underlying table and column names associated with a
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specific result set.
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* Allow access to the current transaction status (Tom)
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* Add ability to pass binary data directly to the backend (Tom)
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* Add PQexecPrepared() and PQsendQueryPrepared() functions which
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@ -594,9 +749,15 @@
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* Prevent possible memory leak or core dump during libpgtcl shutdown
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(Tom)
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* Add ecpg Informix compatibility (Michael)
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Note: This allows ecpg to process embedded C programs that were
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written using certain Informix extensions.
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* Add ecpg DECIMAL type that is fixed length, for Informix (Michael)
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* Allow thread-safe ecpg with --enable-thread-safety (Lee Kindness,
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Bruce)
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Note: This allows multiple ecpg threads to access the database at
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the same time.
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* Move python client interface to http://www.pygresql.org (Marc)
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_________________________________________________________________
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@ -625,7 +786,13 @@
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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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* Remove --enable-recode option to configure
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Note: This was no longer needed now that we have CREATE CONVERSION.
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* Generate a compile error if spinlock code is not found (Bruce)
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Note: Platforms without spinlock code will now fail to compile,
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rather than silently using semaphores. This failure can be disabled
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with a new configure option.
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_________________________________________________________________
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Contrib Changes
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@ -663,7 +830,7 @@
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field order
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* Input date order must now be YYYY-MM-DD (with 4-digit year) or
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match DATESTYLE
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* Pattern matching operations can use indexes regardless of locale
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* Pattern matching operations can use indexes regardless of locale?
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_________________________________________________________________
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Release 7.3.4
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