Github user yhuai commented on the pull request:
https://github.com/apache/spark/pull/9739#issuecomment-157878002
So, the problem is that when we use `apply` method on this UDF, we will not
be able to pass in the type and thus, we fail to do type casting, right? It is
not the case for using `expr` because the udf we get from the function registry
has the input type. It will be great to update the description to describe the
problem.
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