MySQL 4.1.6 がリリースされました。
引き続き ガンマ版です。


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■Functionality added or changed:
* Added option --sigint-ignore to the mysql command line client to
make it ignore SIGINT signals (typically the result of the user
pressing Control-C).
* InnoDB: Added the startup option and settable global variable
innodb_max_purge_lag for delaying INSERT, UPDATE and DELETE
operations when the purge operations are lagging. The default
value of this parameter is zero, meaning that there will not be
any delays. See section "Implementation of Multi-Versioning" in
the manual.
* InnoDB: The innodb_autoextend_increment startup option that was
introduced in release 4.1.5 was made a settable global variable.
(Bug #5736)
* TIMESTAMP columns now can store NULL values. To create such a
column, you must explicitly specify the NULL attribute in the
column specification. (Unlike all other column types, TIMESTAMP
columns are NOT NULL by default.)
* Now if ALTER TABLE converts one AUTO_INCREMENT column to another
AUTO_INCREMENT column it will preserve zero values (this includes
the case that we don't change such column at all).
* Now if ALTER TABLE converts some column to TIMESTAMP NOT NULL
column it will convert NULL values to current timestamp value (One
can still get old behavior by setting system TIMESTAMP variable to
zero).
* On Windows, the MySQL configuration files included in the package
now use `.ini' instead of `.cnf' as the file name suffix.


■Bugs fixed:
* Fixed a bug which caused the server to crash on attempt to execute
a prepared statement with a subselect inside boolean expression.
(Bug#5987)
* Fixed a bug which caused the server to sometimes choose
non-optimal execution plan for a prepared statement executed with
changed placeholder values. (Bug#6042)
* InnoDB: Make the check for excessive semaphore waits tolerate
glitches in the system clock (do not crash the server if the
system time is adjusted while InnoDB is under load.). (Bug #5898)
* InnoDB: Fixed a bug in the InnoDB FOREIGN KEY parser that
prevented ALTER TABLE of tables containing `#' in their names.
(Bug #5856)
* InnoDB: Fixed a bug that prevented ALTER TABLE t DISCARD
TABLESPACE from working. (Bug #5851)
* InnoDB: SHOW CREATE TABLE now obeys the SET SQL_MODE=ANSI and SET
SQL_QUOTE_SHOW_CREATE=0 settings. (Bug #5292)
* Fixed REVOKE ALL PRIVILEGES, GRANT OPTION FROM user so that all
privileges are revoked correctly. (Bug #5831)
* Fixed a bug that caused the server to crash when character set
conversion was implicitly used in prepared mode; for example, as
in 'abc' LIKE CONVERT('abc' as utf8). (Bug#5688)
* The mysql_change_user() C API function now frees all prepared
statements associated with the connection. (Bug #5315)
* Fixed a bug when inserting NULL into an AUTO_INCREMENT column
failed, when using prepared statements. (Bug #5510)
* Fixed slave SQL thread so that the SET COLLATION_SERVER...
statements it replicates don't advance its position (so that if it
gets interrupted before the actual update query, it will later
redo the SET). (Bug #5705)
* Fixed that if the slave SQL thread found a syntax error in a query
(which should be rare, as the master parsed it successfully), it
stops. (Bug #5711)
* Fixed that if a write to a MyISAM table fails because of a full
disk or an exceeded disk quota, it prints a message to the error
log every 10 minutes, and waits until disk space becomes
available. (Bug #3248)
* Now MySQL will not prefer columns, which are mentioned in select
list but are renamed, over columns from other tables participating
in FROM clause when it resolves GROUP BY clause (e.g. SELECT t1.a
AS c FROM t1, t2 ORDER BY a will produce an error if both t1 and
t2 tables contain a column). (Bug #4302)
* Behavior of ALTER TABLE converting column containing NULL values
to AUTO_INCREMENT column is no longer affected by
NO_AUTO_VALUE_ON_ZERO mode. (Bug #5915).