-- SINK_WRITE  |PARTITIONED|
  -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
    -- STREAM_PROJECT  |PARTITIONED|
      -- ASSIGN  |PARTITIONED|
        -- STREAM_SELECT  |LOCAL|
          -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
            -- BTREE_SEARCH  |UNPARTITIONED|
              -- ONE_TO_ONE_EXCHANGE  |LOCAL|
                -- STABLE_SORT [$$15(ASC)]  |LOCAL|
                  -- HASH_PARTITION_EXCHANGE [$$15]  |PARTITIONED|
                    -- STREAM_PROJECT  |PARTITIONED|
                      -- ASSIGN  |PARTITIONED|
                        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                          -- DATASOURCE_SCAN  |PARTITIONED|
                            -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                              -- EMPTY_TUPLE_SOURCE  |PARTITIONED|