-- SINK_WRITE  |PARTITIONED|
  -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
    -- STREAM_PROJECT  |PARTITIONED|
      -- ASSIGN  |PARTITIONED|
        -- STREAM_SELECT  |LOCAL|
          -- ASSIGN  |PARTITIONED|
            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
              -- BTREE_SEARCH  |PARTITIONED|
                -- ONE_TO_ONE_EXCHANGE  |LOCAL|
                  -- STABLE_SORT [$$20(ASC)]  |LOCAL|
                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                      -- STREAM_PROJECT  |PARTITIONED|
                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                          -- RTREE_SEARCH  |PARTITIONED|
                            -- BROADCAST_EXCHANGE  |PARTITIONED|
                              -- ASSIGN  |UNPARTITIONED|
                                -- ASSIGN  |PARTITIONED|
                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                    -- DATASOURCE_SCAN  |PARTITIONED|
                                      -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                        -- EMPTY_TUPLE_SOURCE  |PARTITIONED|