Bug #28430 Failure in replication of innodb partitioned tables on row/mixed format.
In the ha_partition::position we don't calculate the number of the partition of the record. We use m_last_part_value instead relying on that it is set in other place like previous calls of ::write_row(). In replication we do neither of these calls before ::position(). Delete_row_log_event::do_exec_row calls find_and_fetch_row() where we used position() & rnd_pos() calls to find the record for the PARTITION/INNODB table as it posesses InnoDB table flags. Fixed by removing HA_PRIMARY_KEY_REQUIRED_FOR_POSITION flag from PARTITION
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