以此语句生成的计划为：
PLAN FRAGMENT 0
PARTITION: UNPARTITIONED
4:EXCHANGE
tuple ids: 1
PLAN FRAGMENT 1
PARTITION: HASH_PARTITIONED:
STREAM DATA SINK
EXCHANGE ID: 4
UNPARTITIONED
3:AGGREGATE
| output: SUM(), SUM()
| group by:
| tuple ids: 1
|
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