Github user ChengXiangLi commented on the pull request:
https://github.com/apache/flink/pull/1556#issuecomment-177541447
I got it, as most of the work is done by code generation, current
DataSetProjectRule/DataSetFilterRule/DataSetCalRule implementation should be
ready. Most part of `DataSetJoinRule` and `DataSetAggregateRule` has been
finished from my side, i would open a new PR tomorrow.
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