distribute result [$$31] [cardinality: 1000000.0, op-cost: 0.0, total-cost: 1000000.0]
-- DISTRIBUTE_RESULT  |UNPARTITIONED|
  exchange [cardinality: 1000000.0, op-cost: 0.0, total-cost: 1000000.0]
  -- ONE_TO_ONE_EXCHANGE  |UNPARTITIONED|
    aggregate [$$31] <- [agg-sql-sum($$32)] [cardinality: 1000000.0, op-cost: 0.0, total-cost: 1000000.0]
    -- AGGREGATE  |UNPARTITIONED|
      exchange [cardinality: 1000000.0, op-cost: 0.0, total-cost: 1000000.0]
      -- RANDOM_MERGE_EXCHANGE  |PARTITIONED|
        aggregate [$$32] <- [agg-sql-count(1)] [cardinality: 1000000.0, op-cost: 0.0, total-cost: 1000000.0]
        -- AGGREGATE  |PARTITIONED|
          exchange [cardinality: 1000000.0, op-cost: 0.0, total-cost: 1000000.0]
          -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
            data-scan []<-[$$p] <- test.ParquetDataset4 project ({}) [cardinality: 1000000.0, op-cost: 1000000.0, total-cost: 1000000.0]
            -- DATASOURCE_SCAN  |PARTITIONED|
              exchange [cardinality: 0.0, op-cost: 0.0, total-cost: 0.0]
              -- ONE_TO_ONE_EXCHANGE  |PARTITIONED|
                empty-tuple-source [cardinality: 0.0, op-cost: 0.0, total-cost: 0.0]
                -- EMPTY_TUPLE_SOURCE  |PARTITIONED|