Github user zsxwing commented on the pull request:
https://github.com/apache/spark/pull/7448#issuecomment-122142910
Added comments.
> In order for SQL to work better, I think we'd need to create a subtype of
accumulator called LongAccumulator and DoubleAccumulator, that includes
specialized methods for updating.
>
> That can be done in a separate pull request.
Will do it in a follow up PR.
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