Github user twalthr commented on the pull request:
https://github.com/apache/flink/pull/1237#issuecomment-158955674
@aljoscha I thought it makes sense to distinguish between
`AdaptiveTableSource` and `StaticTableSource`. Calculating the predicates to be
pushed down is quite expensive, it should only happen if the TableSource needs
it. `AdaptiveTableSource` need to return `Rows` where fields can be null.
`StaticTableSource`s can return POJOs or Tuples.
@tillrohrmann thanks again for your feedback, I will correct it.
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