Github user koertkuipers commented on the pull request:
https://github.com/apache/spark/pull/13012#issuecomment-218053856
blackbox transformations infer nullable=false when you return a primitive.
for example:
```
scala> sc.parallelize(List(1,2,3)).toDS.map(i => i * 2).schema
res0: org.apache.spark.sql.types.StructType =
StructType(StructField(value,IntegerType,false))
```
why would aggregator be any different?
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