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      Description

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

      The usageļ¼š

      val res = tab
         .flatMap(fun: TableFunction)  // output has columns 'a, 'b, 'c
         .select('a, 'c)
      

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              • Assignee:
                dian.fu Dian Fu
                Reporter:
                sunjincheng121 sunjincheng
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