Alterações na distribuição 3.23.11

Allow the ALTER TABLE tbl_name ADD (field_list) syntax.

• Fixed problem with optimiser that could sometimes use incorrect keys.
• Fixed that GRANT/REVOKE ALL PRIVILEGES doesn't affect GRANT OPTION.
• Removed extra ')' from the output of SHOW GRANTS.
• Fixed problem when storing numbers in timestamps.
• Fix problem with timezones that have half hour offsets.
• Allow the syntax UNIQUE INDEX in CREATE statements.
• mysqlhotcopy - fast online hot-backup utility for local MariaDB databases. By Tim Bunce.
• New more secure mysqlaccess. Thanks to Steve Harvey for this.
• Added --i-am-a-dummy and --safe-updates options to MariaDB.
• Added select_limit and max_join_size variables to MariaDB.
• Added SQL_MAX_JOIN_SIZE and SQL_SAFE_UPDATES options.
• Added READ LOCAL lock that doesn't lock the table for concurrent inserts. (This is used by mysqldump.)
• Changed that LOCK TABLES ... READ doesn't anymore allow concurrent inserts.
• Added --skip-delay-key-write option to mysqld.
• Fixed security problem in the protocol regarding password checking.
• _rowid can now be used as an alias for an integer type unique indexed column.
• Added back blocking of SIGPIPE when compiling with --thread-safe-clients to make things safe for old clients.

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