Javadoc
A transformation that appends an RT bound marker to row iterators in case they don't have one.
This used to happen, for example, in
org.apache.cassandra.db.ReadCommand#executeLocally(ReadExecutionController)if
org.apache.cassandra.db.filter.DataLimits stopped the iterator on a live row that was enclosed in an
older RT.
If we don't do this, and send a response without the closing bound, we can break read/short read protection read
isolation, and potentially cause data loss.
See CASSANDRA-14515 for context.