manuzhang commented on pull request #28916:
URL: https://github.com/apache/spark/pull/28916#issuecomment-650986309
The above log is from this UT.
```scala
df1.where('a > 10).join(df2.where('b > 10), "id").groupBy('a).count()
```
I was not saying that tasks were launched for the stage of coalesced empty
partition but the stage consuming the output of the empty partition, which I
believe is the execution of `groupBy('a).count()` part.
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