Github user sbcd90 commented on the pull request:
https://github.com/apache/spark/pull/13012#issuecomment-218054997
Hello @rxin , @koertkuipers ,
I have been following your conversation & feel that the right fix will be
```
override def nullable: Boolean = Literal.fromObject(aggregator.zero,
bufferExternalType).nullable
```
I'm in the process of updating the PR with the changes. Please let me know
what do you think about the changes.
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