Github user ChengXiangLi commented on the pull request:
https://github.com/apache/flink/pull/1567#issuecomment-177831170
@twalthr and @fhueske , please help to review.
For other rules, `DataSetScanRule` and `DataSetUnionRule` should be ready
yet, and the missed Flink UDF in
`DataSetCalcRule`/`DataSetProjectRule`/`DataSetFilterRule` would be generated
by Timo's work on code generation.
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