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      Description

      Add Aggregate operator to Table API as described in Google doc.

      The usage:

      val res = tab
       .groupBy('a) // leave out groupBy-clause to define global aggregates
       .agg(fun: AggregateFunction)  // output has columns 'a, 'b, 'c
       .select('a, 'c)
      

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            • Assignee:
              hequn8128 Hequn Cheng
              Reporter:
              sunjincheng121 sunjincheng
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