-- SINK_WRITE  |PARTITIONED|
  -- STREAM_PROJECT  |PARTITIONED|
    -- ASSIGN  |PARTITIONED|
      -- SORT_MERGE_EXCHANGE [$$1(ASC), $$2(ASC) ]  |PARTITIONED|
        -- STABLE_SORT [$$1(ASC), $$2(ASC)]  |PARTITIONED|
          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
            -- EXTERNAL_GROUP_BY[$$74, $$75]  |PARTITIONED|
                    {
                      -- AGGREGATE  |LOCAL|
                        -- NESTED_TUPLE_SOURCE  |LOCAL|
                    }
              -- HASH_PARTITION_EXCHANGE [$$74, $$75]  |PARTITIONED|
                -- EXTERNAL_GROUP_BY[$$48, $$49]  |PARTITIONED|
                        {
                          -- AGGREGATE  |LOCAL|
                            -- NESTED_TUPLE_SOURCE  |LOCAL|
                        }
                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                    -- STREAM_SELECT  |PARTITIONED|
                      -- ASSIGN  |PARTITIONED|
                        -- STREAM_PROJECT  |PARTITIONED|
                          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                            -- DATASOURCE_SCAN  |PARTITIONED|
                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|