Jackie-Jiang opened a new pull request, #14645:
URL: https://github.com/apache/pinot/pull/14645
Introduce `is_leaf_return_final_result` as an agg option, which leverages
the query option `serverReturnFinalResultKeyUnpartitioned` introduced in #13208
to reduce the data transferred for aggregation group-by.
When this option is set to true, LEAF aggregate will directly send final
result to the FINAL aggregate. This is particular useful for DISTINCT_COUNT
family aggregate when aggregated values are partitioned.
E.g.
```
SELECT /*+ aggOptions(is_leaf_return_final_result='true') */ {tbl1}.name,
COUNT(*), SUM({tbl1}.num), COUNT(DISTINCT {tbl1}.num) FROM {tbl1} /*+
tableOptions(partition_function='hashcode', partition_key='num',
partition_size='4', partition_parallelism='2') */ GROUP BY {tbl1}.name
```
```
SELECT /*+ aggOptions(is_leaf_return_final_result='true') */ {tbl1}.name,
SUM({tbl2}.num), COUNT(DISTINCT {tbl2}.num) FROM {tbl1} /*+
tableOptions(partition_function='hashcode', partition_key='num',
partition_size='4') */ JOIN {tbl2} /*+
tableOptions(partition_function='hashcode', partition_key='num',
partition_size='4') */ ON {tbl1}.num = {tbl2}.num GROUP BY {tbl1}.name
```
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