-- SINK_WRITE  |PARTITIONED|
  -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
    -- STREAM_PROJECT  |PARTITIONED|
      -- ASSIGN  |PARTITIONED|
        -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
          -- PRE_CLUSTERED_GROUP_BY[$$14]  |PARTITIONED|
                  {
                    -- AGGREGATE  |LOCAL|
                      -- NESTED_TUPLE_SOURCE  |LOCAL|
                  }
            -- HASH_PARTITION_MERGE_EXCHANGE MERGE:[$$14(ASC)] HASH:[$$14]  |PARTITIONED|
              -- PRE_CLUSTERED_GROUP_BY[$$4]  |LOCAL|
                      {
                        -- AGGREGATE  |LOCAL|
                          -- NESTED_TUPLE_SOURCE  |LOCAL|
                      }
                -- ONE_TO_ONE_EXCHANGE  |LOCAL|
                  -- STABLE_SORT [$$4(ASC)]  |LOCAL|
                    -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                      -- STREAM_PROJECT  |PARTITIONED|
                        -- UNNEST  |PARTITIONED|
                          -- ASSIGN  |PARTITIONED|
                            -- ASSIGN  |PARTITIONED|
                              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                -- DATASOURCE_SCAN  |PARTITIONED|
                                  -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                                    -- EMPTY_TUPLE_SOURCE  |PARTITIONED|