Github user rxin commented on the pull request:
https://github.com/apache/spark/pull/13271#issuecomment-221740720
Also the before change for whole stage codegen seems wrong. It's from way
before this pr.
```
WholeStageCodegen
: +- TungstenAggregate(key=[],
functions=[(count(1),mode=Final,isDistinct=false)], output=[count(1)#5658L])
: +- INPUT
+- Exchange SinglePartition, None
+- WholeStageCodegen
: +- TungstenAggregate(key=[],
functions=[(count(1),mode=Partial,isDistinct=false)], output=[count#5660L])
: +- Project
: +- INPUT
+- Scan ExistingRDD[key#5644,value#5645]
```
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