Slave starts accepting and handling rows of master's tables which have more columns.
The most important part of implementation is how to caclulate the amount of bytes to
skip for unknown by slave column.

To solve that issue this WL adopts results of WL#3228 which introduces an addon to
table_map event that carries the necessary part of information about sizes of data of columns.

mysql-test/extra/rpl_tests/rpl_extraMaster_Col.test@stripped, 2007-07-26 21:31:54-04:00, cbell@mysql_cab_desk. +393 -0
WL#3915  master's cols > slave

basic tests checking altering and skipping extra fields by slave.
The fields can be of any possible types.