Add 7.0 changes to HISTORY file. This has to go into SGML eventually,
but we should get it out to beta testers.
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Bruce Momjian
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HISTORY
287
HISTORY
@ -2,6 +2,7 @@
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Chapter 0. Release Notes
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Table of Contents
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Release 7.0
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Release 6.5.3
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Release 6.5.2
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Release 6.5.1
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@ -26,6 +27,292 @@ Chapter 0. Release Notes
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Postgres95 Beta 0.01
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Timing Results
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Release 7.0
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-----------
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This release shows the continued growth of PostgreSQL. There are more
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updated items in 7.0 than in any previous release. Don't be concerned
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this is a dot-zero release. PostgreSQL does its best to put
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out only solid releases, and this one is no exception.
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Major changes in this release:
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Foreign Keys: Foreign keys are now implemented, with the exception of
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PARTIAL MATCH foreign keys. Many users have been asking for this
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feature, and we are pleased to finally offer it.
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Optimizer Overhaul: Continuing on work started a year ago, the
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optimizer has been overhauled in many significant ways, allowing better
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query execution processing with faster performance and less memory
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usage.
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Updated psql: psql, our interactive terminal monitor, has been updated,
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with a variety of new features. See the psql manual page for the details.
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Upcoming Features: In 7.1, we plan to have outer joins, storage for very long
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rows, and a write-ahead logging system.
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Bug Fixes
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---------
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Prevent function calls with more than maximum number of arguments (Tom)
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Many fixes for CASE (Tom)
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Many array fixes (Tom)
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Fix SELECT coalesce(f1,0) FROM int4_tbl GROUP BY f1 (Tom)
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Fix SELECT sentence.words[0] FROM sentence GROUP BY sentence.words[0] (Tom)
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Allow utility statements in plpgsql (Tom)
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Fix GROUP BY scan bug (Tom)
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Optimize btree searching for cases where many equal keys exist (Tom)
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Allow bare column names to be subscripted as arrays (Tom)
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Improvements in SQL grammar processing(Tom)
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Fix for views involved in INSERT ... SELECT ... (Tom)
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Fix for SELECT a/2, a/2 FROM test_missing_target GROUP BY a/2 (Tom)
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Fix for subselects in INSERT ... SELECT (Tom)
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Prevent INSERT ... SELECT ... ORDER BY (Tom)
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Improve type casting of int and float constants (Tom)
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Cleanups for int8 inputs, range checking, and type conversion (Tom)
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Fix for SELECT timespan('21:11:26'::time) (Tom)
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Fixes for relations greater than 2GB, including vacuum
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Improve communication of system table changes to other running backends (Tom)
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Improve communication of user table modifications to other running backends (Tom)
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Fix handling of temp tables in complex situations (Bruce, Tom)
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Disallow DROP TABLE/DROP INDEX inside a transaction block
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Prevent exponential space consumption with many AND's and OR's (Tom)
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Collect attribute selectivity values for system columns (Tom)
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Allow table locking when tables opened, improving concurrent reliability (Tom)
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Fix for netmask('x.x.x.x/0') is 255.255.255.255 instead of 0.0.0.0
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(Oleg Sharoiko)
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Properly quote sequence names in pg_dump (Ross J. Reedstrom)
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Prevent DESTROY DATABASE while others accessing
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Prevent any rows from being returned by GROUP BY if no rows processed (Tom)
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Reduce memory usage of aggregates (Tom)
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Fix SELECT COUNT(1) FROM table WHERE ...' if no rows matching WHERE (Tom)
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Fix pg_upgrade so it works for MVCC(Tom)
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Add nbtree operator class for NUMERIC(Jan)
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Fix for SELECT ... WHERE x IN (SELECT ... HAVING SUM(x) > 1) (Tom)
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Make TABLE optional keyword in LOCK TABLE (Bruce)
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Fix for "f1 datetime default 'now'" (Tom)
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Allow comment-only lines, and ;;; lines too. (Tom)
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Improve recovery after failed disk writes, disk full (Hiroshi)
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Fix cases where table is mentioned in FROM but not joined (Tom)
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Allow HAVING clause without aggregate functions (Tom)
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Fix for "--" comment and no trailing newline, as seen in Perl
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Improve pg_dump failure error reports (Bruce)
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Perl fix for large objects containing NUL characters (Douglas Thomson)
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Allow sorts and hashes to exceed 2GB file sizes (Tom)
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ODBC fix for for large objects (free)
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Fix for pg_dump dumping of inherited rules (Tom)
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Fix for NULL handling comparisons (Tom)
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Fix inconsistent state caused by failed CREATE/DROP commands (Hiroshi)
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Fix for dbname with dash
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Fix problems with CURRENT_DATE used in DEFAULT (Tom)
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Prevent DROP INDEX from interfering with other backends (Tom)
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Fix file descriptor leak in verify_password()
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Fix for "Unable to identify an operator =$" problem
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Fix ODBC so no segfault if CommLog and Debug enabled (Dirk Niggemann)
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Fix for recursive exit call (Massimo)
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Fix indexing of cidr
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Fix for extra-long timezones (Jeroen van Vianen)
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Make pg_dump preserve primary key information (Peter E)
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Prevent databases with single quotes (Peter E)
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Prevent DROP DATABASE inside transaction (Peter E)
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ecpg memory leak fixes (Stephen Birch)
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Fix for Ethernet MAC addresses (macaddr type) comparisons
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Fix for SELECT null::text, SELECT int4fac(null) and SELECT 2 + (null) (Tom)
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Fix for LIKE optimization to use indexes with multi-byte encodings (Tom)
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Y2K timestamp fix (Massimo)
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Fix for date/time types when overflows happened in computations (Tom)
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Fix for VACUUM 'HEAP_MOVED_IN was not expected' errors (Tom)
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Fix for views with tables/columns containing spaces (Tom)
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Allow array on int8 (Peter E)
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Prevent permissions on indexes (Peter E)
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Fix for rounding/overflow of NUMERIC type, like NUMERIC(4,4) (Tom)
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Fix for spinlock stuck problem when error is generated (Hiroshi)
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Allow NUMERIC arrays
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Fix ipcclean on Linux
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Fix handling of NULL constraint conditions (Tom)
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Fix bugs in NUMERIC ceil() and floor() functions (Tom)
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Make char_length()/octet_length including trailing blanks (Tom)
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Made abstime/reltime use int4 instead of time_t (Peter E)
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Fix memory leak in odbc driver (Nick Gorham)
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Fix r-tree index optimizer selectivity (Thomas)
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Enhancements
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------------
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New CLI interface include file sqlcli.h, based on SQL3/SQL98
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Remove all limits on query length, row length limit still exists (Tom)
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Improve optimizer selectivity computations and functions (Tom)
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Enable fast LIKE index processing only if index present (Tom)
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Revise parse_coerce() to handle coercion of int and float constants (Tom)
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Re-use free space on index pages with duplicates (Tom)
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Improve hash join processing (Tom)
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Prevent descending sort if result is already sorted(Hiroshi)
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Allow commuting of index scan query qualifications (Tom)
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Prefer index scans in cases where ORDER BY/GROUP BY is required (Tom)
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Allocate large memory requests in fix-sized chunks for performance (Tom)
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Fix vacuum's performance by reducing memory allocation requests (Tom)
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Update jdbc protocol to 2.0 (Jens Glaser jens@jens.de)
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Add TRUNCATE command to quickly truncate relation (Mike Mascari)
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Implement constant-expression simplification (Bernard Frankpitt, Tom)
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Fix to give super user and createdb user proper update catalog rights (Peter E)
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Allow more than first column to be used to determine start of index scan
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(Hiroshi)
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Allow ecpg bool variables to have NULL values (Christof)
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Issue ecpg error if NULL value is returned to variable with no NULL
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indicator (Christof)
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Allow ^C to cancel COPY command (Massimo)
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Add SET FSYNC and SHOW PG_OPTIONS commands(Massimo)
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Improve CREATE FUNCTION to allow type conversion specification
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(Bernie Frankpitt)
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Add CmdTuples() to libpq++(Vince)
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New CREATE CONSTRAINT TRIGGER and SET CONSTRAINTS commands(Jan)
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Allow CREATE FUNCTION WITH clause to be used for all language types
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configure --enable-debug adds -g (Peter E)
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configure --disable-debug removes -g (Peter E)
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Allow more complex default expressions (Tom)
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First real FOREIGN KEY constraint trigger functionality (Jan)
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Add FOREIGN KEY ... MATCH FULL ... ON DELETE CASCADE (Jan)
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Add FOREIGN KEY ... MATCH <unspecified> referential actions (Don Baccus)
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Allow WHERE restriction on ctid (physical heap location) (Hiroshi)
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Move pginterface from contrib to interface directory, rename to pgeasy (Bruce)
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Add DEC and SESSION_USER as reserved words
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Prevent quadruple use of disk space when doing internal sorting (Tom)
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Require SELECT DISTINCT target list to have all ORDER BY columns (Tom)
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Add Oracle's COMMENT ON command (Mike Mascari <mascarim@yahoo.
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libpq's PQsetNoticeProcessor function now returns previous hook(Peter E)
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Prevent PQsetNoticeProcessor from being set to NULL (Peter E)
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Make USING in COPY optional (Bruce)
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Faster sorting by calling fewer functions (Tom)
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Create system indexes to match all system caches(Bruce, Hiroshi)
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Make system caches use system indexes(Bruce)
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Make all system indexes unique(Bruce)
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Allow subselects in the target list (Tom)
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Allow subselects on the left side of comparison operators (Tom)
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New parallel regression test (Jan)
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Change backend-side COPY to write files with permissions 644 not 666 (Tom)
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Force permissions on PGDATA directory to be secure, even if it exists (Tom)
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Added psql LastOid variable to return last inserted oid (Peter E)
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Improve pg_statistics management for VACUUM speed improvement (Tom)
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Allow concurrent vacuum and remove pg_vlock vacuum lock file (Tom)
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Add permissions check so only Postgres superuser or table owner can
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vacuum (Peter E)
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New C-routines to implement a BIT and BIT VARYING type in /contrib
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(Adriaan Joubert)
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New libpq functions to allow asynchronous connections: PQconnectStart(),
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PQconnectPoll(), PQresetStart(), PQresetPoll(), PQsetenvStart(),
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PQsetenvPoll(), PQsetenvAbort (Ewan Mellor)
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New libpq PQsetenv() function (Ewan Mellor)
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create/alter user extension (Peter E)
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New postmaster.pid and postmaster.opts under $PGDATA (Tatsuo)
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New scripts for create/drop user/db (Peter E)
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Major psql overhaul(Peter E)
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Add const to libpq interface(Peter E)
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New libpq function PQoidValue (Peter E)
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Show specific non-aggregate causing problem with GROUP BY (Tom)
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Force changes to pg_shadow recreate pg_pwd file (Peter E)
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Add aggregate(DISTINCT ...) (Tom)
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Allow flag to control COPY input/output of NULLs (Peter E)
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Make postgres user have a password by default (Peter E)
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Add CREATE/ALTER/DROP GROUP (Peter E)
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All administration scripts now support --long options (Peter E, Karel)
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Vacuumdb script now supports --alldb option (Peter E)
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ecpg new portable FETCH syntax
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Add ecpg EXEC SQL IFDEF, EXEC SQL IFNDEF, EXEC SQL ELSE, EXEC SQL ELIF
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and EXEC SQL ENDIF directives
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Add pg_ctl script to control backend startup (Tatsuo)
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Add postmaster.opts.default file to store startup flags (Tatsuo)
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Allow --with-mb=SQL_ASCII
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Increase maximum number of index keys to 16 (Bruce)
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Increase maximum number of function arguments to 16 (Bruce)
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Allow user configuration of maximum number of index keys and arguments
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(Bruce)
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Flush backend cache less frequently (Tom, Hiroshi)
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Allow unprivileged users to change their passwords (Peter E)
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With password authentication enabled, new users without passwords can't
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connect (Peter E)
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Disallow dropping a user who owns a database (Peter E)
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Add initdb --enable-multibyte option (Peter E)
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Add option for initdb to prompts for superuser password (Peter E)
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COPY now reuses previous memory allocation, improving performance (Tom)
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Allow complex type casts like col::numeric(9,2) and col::int2::float8 (Tom)
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Updated user interfaces on initdb, initlocation, pg_dump, ipcclean
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(Peter E)
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NUMERIC now accepts scientific notation (Tom)
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NUMERIC to int4 rounds (Tom)
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Convert float4/8 to NUMERIC properly (Tom)
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New pg_char_to_encoding() and pg_encoding_to_char() functions
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Libpq non-blocking mode (Alfred Perlstein)
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Improve conversion of types in casts that don't specify a length
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New plperl internal programming language (Mark Hollomon)
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Allow COPY IN to read file that do not end with a newline (Tom)
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Improve optimization cost estimation (Tom)
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Indicate when long identifiers are truncated (Tom)
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Improve optimizer estimate of range queries x > lowbound AND x < highbound (Tom)
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Allow aggregates to use type equivalency (Peter E)
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Add Oracle's to_char(), to_date(), to_datetime(), to_timestamp(), to_number()
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conversion functions (Karel Zak <zakkr@zf.jcu.cz>)
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Add SELECT DISTINCT ON (expr [, expr ...]) targetlist ... (Tom)
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Check to be sure ORDER BY is compatible with the DISTINCT operation (Tom)
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Use DNF instead of CNF where appropriate (Tom, Taral)
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Add NUMERIC and int8 types to ODBC
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Improve EXPLAIN results for Append, Group, Agg, Unique (Tom)
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Added ALTER TABLE ... ADD FOREIGN KEY (Stephan Szabo)
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Further cleanup for OR-of-AND WHERE-clauses (Tom)
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Make use of index in OR clauses (x = 1 AND y = 2) OR (x = 2 AND y = 4) (Tom)
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Allow SELECT .. FOR UPDATE in PL/pgSQL (Hiroshi)
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Enable backward sequential scan even after reaching EOF (Hiroshi)
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Add btree indexing of boolean values, >= and <= (Don Baccus)
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Print current line number when COPY FROM fails (Massimo)
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Recognize special case of POSIX time zone: "GMT+8" and "GMT-8" (Thomas)
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Add "DEC" as synonym for "DECIMAL (Thomas)
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Add "SESSION_USER" as SQL92 keyword, same as CURRENT_USER (Thomas)
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Implement column aliases (aka correlation names) and more join syntax
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(Thomas)
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Allow queries like SELECT a FROM t1 tx (a) (Thomas)
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Allow queries like SELECT * FROM t1 NATURAL JOIN t2 (Thomas)
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Smarter optimizer computations for random index page access (Tom)
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New SET variable to control optimizer costs (Tom)
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Optimizer queries based on LIMIT, OFFSET, and EXISTS qualifications (Tom)
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Reduce optimizer internal housekeeping of join paths for speedup (Tom)
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Make "INTERVAL" reserved word allowed as a column identifier (Thomas)
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Allow type conversion with NUMERIC (Thomas)
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Make ISO date style (2000-02-16 09:33) the default (Thomas)
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Implement REINDEX command (Hiroshi)
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Accept ALL in aggregate function SUM(ALL col) (Tom)
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Prevent GROUP BY from using column aliases (Tom)
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New psql \encoding option (Tatsuo)
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Allow PQrequestCancel() to terminate when in waiting-for-lock state (Hiroshi)
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Allow negation of a negative number in all cases
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Add ecpg descriptors
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Allow CREATE VIEW v AS SELECT f1::char(8) FROM tbl
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Source Tree Changes
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-------------------
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Fix for linux PPC compile
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New generic expression-tree-walker subroutine (Tom)
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Change form() to varargform() to prevent portability problems.
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Improved range checking for large integers on Alpha's
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Clean up #include in /include directory (Bruce)
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Add scripts for checking includes (Bruce)
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Remove un-needed #include's from *.c files (Bruce)
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Change #include's to use <> and "" as appropriate (Bruce)
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Enable WIN32 compilation of libpq
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Alpha spinlock fix from Uncle George <gatgul@voicenet.com>
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Overhaul of optimizer data structures (Tom)
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Fix to cygipc library (Yutaka Tanida)
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Allow pgsql to work on newer Cygwin snapshots(Dan)
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New catalog version number (Tom)
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Add Linux ARM.
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Rename heap_replace to heap_update
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Update for QNX (Kardos, Dr. Andrea)
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New platform-specific regression handling (Tom)
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Rename oid8 -> oidvector and int28 -> int2vector (Bruce)
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Included all yacc and lex files into the distribution (Peter E.)
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Remove lextest, no longer needed (Peter E)
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Fix for libpq and psql on Win32 (Magnus)
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Internally change datetime and timespan into timestamp and interval (Thomas)
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Fix for plpgsql on BSDI
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Release 6.5.3
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This is basically a cleanup release for 6.5.2. We have added a new pgaccess
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