Github user ChengXiangLi commented on the pull request:
https://github.com/apache/flink/pull/1544#issuecomment-176144759
I didn't prefer Java or Scala, the reason why i writen this in Java is
that, this part logic would be translated from Calcite RelNodes(which is in
Java) and finally could build Flink program based on Flink Java DataSet API.
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