-- SINK_WRITE  |PARTITIONED|
  -- STREAM_PROJECT  |PARTITIONED|
    -- SORT_MERGE_EXCHANGE [$$7(ASC) ]  |PARTITIONED|
      -- STREAM_PROJECT  |PARTITIONED|
        -- STREAM_SELECT  |PARTITIONED|
          -- ASSIGN  |PARTITIONED|
            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
              -- DATASOURCE_SCAN  |PARTITIONED|
                -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                  -- EMPTY_TUPLE_SOURCE  |PARTITIONED|