RBR slave type conversion

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RBR slave type conversion
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In statement-based replication, it is possible to replicate between tables with
different definitions since the statement is just executed on the slave.

For row-based replication, the raw data is replicated, so it is currently not
possible to replicate between columns with different types. Typical examples are
replicating between different types of integers, different types of decimal
numbers, or from one string type to a shorter string type.

Varible slave_type_conversions of **mysqld**.

http://forge.mysql.com/worklog/task.php?id=5151
http://dev.mysql.com/doc/refman/5.5/en/replication-features-differing-tables.html