Github user ZunwenYou commented on the issue:
https://github.com/apache/spark/pull/17000
Hi, @MLnick
You are right, sliceAggregate splits an array into smaller chunks before
shuffle.
It has three advantage
Firstly, the shuffle data is less than treeAggregate during the whole
transformation operation.
Secondly, as your description, it allows more concurrency, not only during
the collect operation of driver, but also in the process of run **_seqOp_** and
**_combOp_**.
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