-- SINK_WRITE  |PARTITIONED|
  -- STREAM_PROJECT  |PARTITIONED|
    -- SORT_MERGE_EXCHANGE [$$8(ASC) ]  |PARTITIONED|
      -- STREAM_PROJECT  |PARTITIONED|
        -- STREAM_SELECT  |PARTITIONED|
          -- ASSIGN  |PARTITIONED|
            -- ASSIGN  |PARTITIONED|
              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                -- DATASOURCE_SCAN  |PARTITIONED|
                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|