Github user yhuai commented on the pull request:

    https://github.com/apache/spark/pull/9556#issuecomment-155180027
  
    I think one follow-up work is to add tests in `ExpressionTypeCheckingSuite` 
to make sure those newly added agg functions (e.g. corr and variance) throw the 
right exception when the input data types do not match the expected types.


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