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(mysql.info)News-3.20.17

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Changes in release 3.20.17
--------------------------

   * You can now use `BLOB' columns and the functions `IS NULL' and `IS
     NOT NULL' in the `WHERE' clause.

   * All communication packets and row buffers are now allocated
     dynamically on demand. The default value of `max_allowed_packet'
     is now 64K for the server and 512K for the client. This is mainly
     used to catch incorrect packets that could trash all memory. The
     server limit may be changed when it is started.

   * Changed stack usage to use less memory.

   * Changed `safe_mysqld' to check for running daemon.

   * The `ELT()' function is renamed to `FIELD()'.  The new `ELT()'
     function returns a value based on an index: `FIELD()' is the
     inverse of `ELT()' Example: `ELT(2,"A","B","C")' returns `"B"'.
     `FIELD("B","A","B","C")' returns `2'.

   * `COUNT(field)', where `field' could have a `NULL' value, now works.

   * A couple of bugs fixed in `SELECT ... GROUP BY'.

   * Fixed memory overrun bug in `WHERE' with many unoptimizable brace
     levels.

   * Fixed some small bugs in the grant code.

   * If hostname isn't found by `get_hostname', only the IP is checked.
     Previously, you got `Access denied'.

   * Inserts of timestamps with values didn't always work.

   * `INSERT INTO ... SELECT ... WHERE' could give the error
     `Duplicated field'.

   * Added some tests to `safe_mysqld' to make it "safer".

   * `LIKE' was case sensitive in some places and case insensitive in
     others.  Now `LIKE' is always case insensitive.

   * `mysql.cc': Allow `'#'' anywhere on the line.

   * New command `SET OPTION SQL_SELECT_LIMIT=#'. See the FAQ for more
     details.

   * New version of the `mysqlaccess' script.

   * Change `FROM_DAYS()' and `WEEKDAY()' to also take a full
     `TIMESTAMP' or `DATETIME' as argument. Before they only took a
     number of type `YYYYMMDD' or `YYMMDD'.

   * Added new function `UNIX_TIMESTAMP(timestamp_column)'.