zhengruifeng commented on PR #53400:
URL: https://github.com/apache/spark/pull/53400#issuecomment-3639978666
> The basic idea is to implement aggregation (and partial aggregation) by:
`df.selectExpr("rand() as
key").mapInArrow(reduce).groupBy(key).applyInArrow(merge)`
I think there should be a `sortWithinPartitions` before `mapInArrow` for
partial aggregation.
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