Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/9038#issuecomment-147151593
For that failed test, I think the problem is that those two agg operators
in the reducer are holding the same reference of those aggregate functions.
Essentially, we want to have a way to clone a agg function without changing
`aggBufferAttributes` and `inputAggBufferAttributes`. How about we address this
issue in a separate PR?
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