Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/439#issuecomment-89552295
I recommend to implement the execution logic of the grouping set first.
I know that we support only the syntax of data cube without execution
logic. However, it is the leavings of the removed data cube operator execution
logic.
Honestly, we had code lines for data cube operator execution, but have
removed them due to its low performance. However, we didn't removed the syntax
part because we must support it again.
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