Github user aljoscha commented on the pull request:
https://github.com/apache/flink/pull/867#issuecomment-115248743
@StephanEwen hinted that the best way to go would be to decuple the
RowTypeInfo completely from the TupleTypeInfo/TupleSerializerBase. This way, we
get null-value support in the Table API without changing the existing code for
tuples. This would require changing the RowTypeInfo to no longer be a child of
CaseClassTypeInfo and creating non-subclass RowSerializer and RowComparator.
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