-- SINK_WRITE  |UNPARTITIONED|
  -- STREAM_PROJECT  |UNPARTITIONED|
    -- AGGREGATE  |UNPARTITIONED|
      -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
        -- HYBRID_HASH_JOIN [$$0][$$1]  |UNPARTITIONED|
          -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
            -- UNNEST  |UNPARTITIONED|
              -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|
          -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
            -- UNNEST  |UNPARTITIONED|
              -- EMPTY_TUPLE_SOURCE  |UNPARTITIONED|