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Update HISTORY.

This commit is contained in:
Bruce Momjian 2003-10-31 04:32:36 +00:00
parent d6ad5375cb
commit 88a7576897
1 changed files with 179 additions and 12 deletions
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HISTORY
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@ -8,12 +8,11 @@
Major changes in this release:
* IN/NOT IN subqueries are now much more efficient
Note: In previous releases, IN/NOT IN subqueries were joined to the
upper query by sequentially scanning the subquery looking for a
join. The 7.4 code uses the same sophisticated techniques used by
ordinary joins and so is much faster, and is now faster than EXISTS
subqueries.
In previous releases, IN/NOT IN subqueries were joined to the
upper query by sequentially scanning the subquery looking for a
join. The 7.4 code uses the same sophisticated techniques used by
ordinary joins and so is much faster, and is now faster than
EXISTS subqueries.
* Improved GROUP BY processing by using hash buckets
Note: In previous releases, GROUP BY totals were accumulated by
@ -353,6 +352,8 @@
Query Changes
* New SQL-standard information schema (Peter)
Note: bjm
* Add read-only transactions (Peter)
* Add server variable regex_flavor to control regular expression
processing (Tom)
@ -360,52 +361,121 @@
Tkach)
* Allow users to see their own queries in pg_stat_activity (Kevin
Brown)
Note: In prior releases, only the super-user could see query
strings using pg_stat_activity. Now ordinary users can see their
own query strings.
* Fix subquery aggregates of upper query columns to match SQL spec.
(Tom)
Note: bjm
* Add option to prevent auto-addition of tables referenced in query
(Nigel J. Andrews)
Note: By default, tables mentioned in the query are automatically
added to the FROM clause if they are not already there. This option
disabled that behavior.
* Allow UPDATE ... SET col = DEFAULT (Rod)
Note: This allows UPDATE to set a column to its default value.
* Allow expressions to be used in LIMIT/OFFSET (Tom)
Note: In prior releases, LIMIT/OFFSET could only use constants, not
expressions.
* Change EXECUTE INTO to CREATE TABLE AS EXECUTE (Peter)
Note: bjm ?
_________________________________________________________________
Object Manipulation Changes
* Make CREATE SEQUENCE grammar more SQL1999 standards compliant
(Neil)
Note: bjm ?
* Add FOR EACH STATEMENT statement-level triggers (Neil)
Note: While this allows a trigger to fire at the end of a
statement, it does not allow the trigger to access all rows
modified by the query. This capability is planned for a future
release.
* Add DOMAIN CHECK constraints (Rod)
Note: This greatly increases the usefulness of domains by allowing
them to use CHECK constraints.
* Add ALTER DOMAIN .. SET / DROP NOT NULL, SET / DROP DEFAULT, ADD /
DROP CONSTRAINT (Rod)
Note: This allows manipulation of existing domains.
* Fix several zero-column table bugs (Tom)
Note: PostgreSQL supports zero-column tables. This fixes various
bugs that occur when using such tables.
* Have ALTER TABLE ... ADD PRIMARY KEY add NOT NULL constraint (Rod)
Note: In prior releases, ALTER TABLE ADD PRIMARY would add a unique
index, but not a NOT NULL constraint. That is fixed in this
release.
* Add ALTER DOMAIN OWNER (Rod)
* Add ALTER TABLE ... WITHOUT OIDS (Rod)
Note: This allows control over whether new and updated rows will
have an oid column. This is most useful for saving storage space.
* Add ALTER SEQUENCE to modify min/max/increment/cache/cycle values
(Rod)
* Add ALTER TABLE ... CLUSTER ON (Alvaro Herrera)
Note: This command is used by pg_dump to record the CLUSTER column
for each table previously clustered. This information is used by
database-wide cluster to cluster all previously clustered tables.
* Improve DOMAIN automatic type casting (Rod, Tom)
* Allow dollar signs in identifiers, except as first character (Tom)
* Disallow dollar signs in operator names, so x=$1 works (Tom)
* Allow SQL200X inheritance syntax LIKE *subtable*, INCLUDING
DEFAULTS (Rod)
* Add WITH GRANT OPTION clause to GRANT, per SQL spec (Peter)
Note: Allow GRANT to give other users the ability to grant
permissions on a object.
_________________________________________________________________
Utility Command Changes
* Add ON COMMIT clause to CREATE TABLE for temp tables (Gavin)
Note: This adds the ability for a table to be dropped or all rows
deleted on transaction commit.
* Allow cursors outside transactions using WITH HOLD (Neil)
Note: In previous releases, cursors were removed at the end of the
transaction. Using WITH HOLD, the current release allows
transaction to remain outside their own transaction.
* MOVE/FETCH 0 now does nothing (Bruce)
Note: In previous releases, MOVE 0 moved to the end of the cursor,
and FETCH 0 fetched all remaning rows.
* Cause MOVE/FETCH to return the number of rows moved/fetched, or
zero if at the beginning/end of cursor, per SQL spec (Bruce)
Note: In prior releases, the row count returned by MOVE and FETCH
did not accurately reflect the number of rows processed.
* Properly handle SCROLL with cursors, or report an error (Neil)
Note: Certain cursors can not be fetched backwards optimally. By
specifying SCROLL, extra work will be performed to guarantee that
the cursor can be fetched in reverse or random order.
* Implement SQL92-compatible FIRST, LAST, ABSOLUTE n, RELATIVE n
options for FETCH and MOVE (Tom)
* Allow EXPLAIN on DECLARE CURSOR (Tom)
Note: Prior versions would not allow EXPLAIN on a DECLARE
statement.
* Allow CLUSTER to use index marked as pre-clustered by default
(Alvaro Herrera)
* Allow CLUSTER to cluster all tables (Alvaro Herrera)
Note: This allows all previously clustered tables in a database to
be reclustered with a single command.
* Prevent CLUSTER on partial indexes (Tom)
* Allow \r and \r\n termination for COPY files (Bruce)
* Disallow literal carriage return as a data value,
@ -414,10 +484,15 @@
* Recover from COPY IN/OUT failure cleanly (Tom)
* Prevent possible memory leaks in COPY (Tom)
* Make TRUNCATE transaction-safe (Rod)
* Multiple pg_dump fixes, including tar format and large objects
Note: Truncate can now be used inside a transaction, and rolled
back if the transaction aborts.
* Multiple pggla_dump fixes, including tar format and large objects
* Allow pg_dump to dump specific schemas (Neil)
* Allow pg_dump to preserve column storage characteristics
(Christopher)
Note: This preserves ALTER TABLE ... SET STORAGE information.
* Allow pg_dump to preserve CLUSTER characteristics (Christopher)
* Have pg_dumpall use GRANT/REVOKE to dump database-level
permissions (Tom)
@ -435,30 +510,56 @@
* Allow pg_ctl to better handle non-standard ports (Greg)
* Functional indexes have been generalized into expressional indexes
(Tom)
Note: In prior releases, only columns could be used in functional
indexes. This release allows any type of expression.
* Syntax errors now reported as 'syntax error' rather than 'parse
error' (Tom)
* Have SHOW TRANSACTION_ISOLATION match input to SET
TRANSACTION_ISOLATION (Tom)
* Have COMMENT ON DATABASE on non-local database generate a warning
(Rod)
Note: Database comments are stored in database-local tables so
comments on a database have to be stored in each database.
* Improve reliability of LISTEN/NOTIFY (Tom)
* Allow REINDEX to reliably reindex non-shared system catalog
indexes (Tom)
Note: This allows system tables to be reindexed without the
requirement of a standalone backend, which was necessary in
previous releases. The only tables that now require a standalone
backend for reindex are the global system tables pg_database,
pg_shadow, and pg_group.
* pg_dump --use-set-session-authorization and --no-reconnect now do
nothing, all dumps use SET SESSION AUTHORIZATION
Note: pg_dump now no longer reconnects to switch users, but instead
uses SET SESSION AUTHORIZATION. This should reduce password
prompting during restores.
* Long options for pg_dump are now available on all platforms
Note: We now include our own long option processing routines.
_________________________________________________________________
Data Type and Function Changes
* New extra_float_digits server parameter to control float precision
display (Pedro Ferreira, Tom)
Note: This controls precision output which was causing regression
testing problems.
* Allow +1300 as a numeric timezone specifier, for FJST (Tom)
* Remove rarely used oidrand(), oidsrand(), and userfntest()
functions (Neil)
* Add md5() function to main server, already in /contrib/pgcrypto
(Joe)
Note: An md5 function was frequently requested. For more complex
encryption capabilities, use /contrib/pgcrypto.
* Increase date range of timestamp (John Cochran)
Note: bjm ??
* Change EXTRACT(EPOCH FROM timestamp) so timestamp without time
zone is assumed to be in local time, not GMT (Tom)
* Trap division by zero in case the operating system doesn't prevent
@ -468,6 +569,9 @@
* Fixes for to_char() (Karel)
* Allow functions that can take any argument data type and return
any data type, using ANYELEMENT and ANYARRAY (Joe)
Note: This allows the creation of functions that can work with any
data type.
* Arrays may now be specified as ARRAY[1,2,3],
ARRAY[['a','b'],['c','d']], or ARRAY[ARRAY[ARRAY[2]]] (Joe)
* Allow proper comparisons for arrays (Joe)
@ -476,18 +580,31 @@
(Joe)
* Allow WHERE qualification 'expr >oper< ANY/SOME/ALL (array-expr)'
(Joe)
Note: This allows arrays to behave like subqueries or a list of
values: SELECT * FROM tab WHERE col IN array_val
* Allow polymorphic SQL functions (Joe)
Note: bjm ??
* New array functions array_append(), array_cat(), array_lower(),
array_prepend(), array_to_string(), array_upper(),
string_to_array() (Joe)
* Allow user defined aggregates to use polymorphic functions (Joe)
Note: bjm ??
* Allow polymorphic user defined aggregates (Joe)
* Allow assignments to empty arrays (Joe)
* Allow 60 in seconds fields of timestamp, time, interval input
values (Tom)
Note: Sixty-second values are needed for leap seconds.
* Allow CIDR data type to be cast to text (Tom)
* Allow the creation of special LIKE indexes for non-C locales
(Peter)
Note: There is no way for non-ASCII locales to use indexes for LIKE
comparisons. However, this release adds a way to create a special
index for LIKE. bjm ??
* Disallow invalid timezone names (Tom)
* Trim trailing spaces when CHAR() is cast to VARCHAR or TEXT (Tom)
* Make FLOAT(p) measure the precision p in bits, not decimal digits
@ -501,10 +618,15 @@
convention for the sign of timezone offsets, ie, positive is east
from UTC (Tom)
* Fix date_trunc('quarter',...) (B?jthe Zolt?n)
Note: Prior releases returned an incorrect value for this function
call.
* Make initcap() more compatible with Oracle (Mike Nolan)
Note: bjm ??
* Allow only DateStyle field order for date values not in ISO format
(Greg)
* Add new DateStyle values MDY, DMY, and YMD, honor US and European
* Add new DateStyle values MDY, DMY, and YMD; honor US and European
for backward compatibility (Tom)
* 'now' will no longer work as a column default, use now() (change
required for prepared statements) (Tom)
@ -519,7 +641,7 @@
Server-side Language Changes
* Prevent PL/pgSQL crash when RETURN NEXT is used on a zero-row
record var. (Tom)
record variable (Tom)
* Make PL/python's spi_execute interface handle NULLs properly
(Andrew Bosma)
* Allow PL/pgSQL to declare variables of composite types without
@ -527,6 +649,11 @@
* Fix PL/python _quote() function to handle big integers (?)
* Make PL/python an untrusted language, now called plpythonu (Kevin
Jacobs, Tom)
Note: The Python language no longer supports a restricted execution
environment, so we removed the trusted version of PL/python. If
this situation changes, we will re-add a version of PL/python that
can be used by non-super users.
* Allow polymorphic PL/pgSQL functions (Tom, Joe)
* Improved compiled function caching mechanism in PL/pgSQL with full
support for polymorphism (Joe)
@ -541,17 +668,32 @@
Psql Changes
* Add "\pset pager always" to always use pager (Greg)
Note: This forces the pager to be used even if the number of rows
is less than the screen height --- this is valuable for rows that
wrap across several screen rows.
* Improve tab completion (Rod, Ross Reedstrom, Ian Barwick)
* Reorder \? help into groupings (Harald Armin Massa, Bruce)
* Add backslash commands for listing schemas, casts, and conversions
(Christopher)
* \encoding now changes based on client_encoding server variable
* \encoding now changes based on the client_encoding server variable
(Tom)
Note: In previous versions, \encoding was not aware of encoding
changes made using SET CLIENT_ENCODING.
* Save edit history into readline history (Ross)
Note: When \e is used to edit a query, the result is saved in the
readline history for retrieval using the up arrow.
* Improve \d display (Christopher)
* Enhance HTML mode to be more standards-compliant (Greg)
* New '\set AUTOCOMMIT off' capability (Tom)
Note: This takes the place of the remove server variable
'autocommit'.
* New '\set VERBOSITY' to control error detail (Tom)
Note: This controls the new error reporting details.
* New %T prompt string to show transaction status (Tom)
* Long options for psql are now available on all platforms
_________________________________________________________________
@ -561,7 +703,16 @@
* Allow PQcmdTuples() to return row counts for MOVE and FETCH (Neil)
* Add PQfreemem() for freeing memory on Win32, suggest for NOTIFY
(Bruce)
Note: Win32 requires that memory allocated in a library be freed by
a function in the same library, hence free() doesn't work for
freeing memory allocated by libpq. PQfreemem() is the proper way to
free libpq memory, especially on Win32, and is recommended for
other platforms as well.
* Document service capability, and add sample file (Bruce)
Note: This allows clients to look up connection information in a
central file on the client machine.
* Make PQsetdbLogin() have the same defaults as PQconnectdb() (Tom)
* Allow libpq to cleanly fail when result sets are too large (Tom)
* Improve performance of PGunescapeBytea() (Ben Lamb)
@ -570,10 +721,14 @@
* Allow pqInternalNotice() to accept a format string and args
instead of just a preformatted message (Tom, Sean Chittenden)
* Allow control SSL negotiation with sslmode values "disable",
"allow", "Prefer", and "require" (Jon Jensen)
"allow", "prefer", and "require" (Jon Jensen)
* Allow new error codes and levels of text (Tom)
* Allow access to the underlying table and column of a query result
(Tom)
Note: This is helpful for query-builder applications that want to
know the underlying table and column names associated with a
specific result set.
* Allow access to the current transaction status (Tom)
* Add ability to pass binary data directly to the backend (Tom)
* Add PQexecPrepared() and PQsendQueryPrepared() functions which
@ -594,9 +749,15 @@
* Prevent possible memory leak or core dump during libpgtcl shutdown
(Tom)
* Add ecpg Informix compatibility (Michael)
Note: This allows ecpg to process embedded C programs that were
written using certain Informix extensions.
* Add ecpg DECIMAL type that is fixed length, for Informix (Michael)
* Allow thread-safe ecpg with --enable-thread-safety (Lee Kindness,
Bruce)
Note: This allows multiple ecpg threads to access the database at
the same time.
* Move python client interface to http://www.pygresql.org (Marc)
_________________________________________________________________
@ -625,7 +786,13 @@
* Improve Linux startup scripts (Slawomir Sudnik, Darko Prenosil)
* Add support for AMD Opteron and Itanium (Jeffrey W. Baker, Bruce)
* Remove --enable-recode option to configure
Note: This was no longer needed now that we have CREATE CONVERSION.
* Generate a compile error if spinlock code is not found (Bruce)
Note: Platforms without spinlock code will now fail to compile,
rather than silently using semaphores. This failure can be disabled
with a new configure option.
_________________________________________________________________
Contrib Changes
@ -663,7 +830,7 @@
field order
* Input date order must now be YYYY-MM-DD (with 4-digit year) or
match DATESTYLE
* Pattern matching operations can use indexes regardless of locale
* Pattern matching operations can use indexes regardless of locale?
_________________________________________________________________
Release 7.3.4