Github user zentol commented on the issue:
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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