ajithme commented on issue #24762: [SPARK-27907][SQL] HiveUDAF with 0 rows 
throw NPE when try to serialize
URL: https://github.com/apache/spark/pull/24762#issuecomment-497833781
 
 
   > I guess anything's better than an NPE. What's the result in this case?
   
   null will be returned
   
   ```
   +------------------------+
   |histogram_numeric( a, 2)|
   +------------------------+
   |                    null|
   +------------------------+
   ```

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