Alterações na distribuição 3.21.17

Changed documentation string of --with-unix-socket-path to avoid confusion.

• Added ODBC and SQL-99 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 values 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.

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