cloud-fan commented on pull request #29021:
URL: https://github.com/apache/spark/pull/29021#issuecomment-654694004
```
SMJ
Sort
Shuffle
Sort
HashAggregate
Shuffle
```
This is an interesting use case. We must be careful when dealing with it.
The key of skew join handling is to split the skew partition into smaller
parts. For `HashAggregate`, I'm not sure if this works, as now the values of
the same key may exist in different after-split partitions. This makes
`HashAggregate` incorrect.
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