Alterações na distribuição 3.23.19

Changed copyright for all files to GPL for the server code and utilities and to LGPL for the client libraries. See http://www.fsf.org/licenses/.

• Fixed bug where all rows matching weren't updated on a MyISAM table when doing update based on key on a table with many keys and some key changed values.
• The Linux MariaDB RPMs and binaries are now statically linked with a linuxthread version that has faster mutex handling when used with MySQL.
• ORDER BY can now use REF keys to find subsets of the rows that need to be sorted.
• Changed name of print_defaults program to my_print_defaults to avoid name confusion.
• Fixed NULLIF() to work as required by SQL-99.
• Added net_read_timeout and net_write_timeout as startup parameters to mysqld.
• Fixed bug that destroyed index when doing myisamchk --sort-records on a table with prefix compressed index.
• Added pack_isam and myisampack to the standard MariaDB distribution.
• Added the syntax BEGIN WORK (the same as BEGIN).
• Fixed core dump bug when using ORDER BY on a CONV() expression.
• Added LOAD TABLE FROM MASTER.
• Added FLUSH MASTER and FLUSH SLAVE.
• Fixed big/little endian problem in the replication.

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