Github user zentol commented on the issue:

    https://github.com/apache/flink/pull/2633
  
    The important class is `CassandraScalaProductSink` which extracts the 
fields from the scala classes. Apart from that it behaves exactly like the 
`CassandraTupleSink`. As a result of that this common behavior was refactored 
into a common abstract class.
    
    The `CassandraSinkBuilder` was slightly refactored to fail on unsupported 
types and not simply assume POJO's. In addition, the `sanityCheck()` method is 
now guaranteed to be called.


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