Changes in release 3.21.17
--------------------------
* Changed documentation string of `--with-unix-socket-path' to avoid
confusion.
* Added ODBC and ANSI SQL style `LEFT OUTER JOIN'.
* The following are new reserved words: `LEFT', `NATURAL', `USING'.
* The client library now uses the value of the environment variable
`MYSQL_HOST' as the default host if it's defined.
* `SELECT col_name, SUM(expr)' now returns `NULL' for `col_name'
when there are matching rows.
* Fixed problem with comparing binary strings and `BLOB's with ASCII
characters over 127.
* Fixed lock problem: when freeing a read lock on a table with
multiple read locks, a thread waiting for a write lock would have
been given the lock. This shouldn't affect data integrity, but
could possibly make `mysqld' restart if one thread was reading
data that another thread modified.
* `LIMIT offset,count' didn't work in `INSERT ... SELECT'.
* Optimized key block caching. This will be quicker than the old
algorithm when using bigger key caches.