Github user chenghao-intel commented on the pull request:
https://github.com/apache/spark/pull/6874#issuecomment-113371367
The Dataframe API does not like the normal function, the string arguments
actually represent the associated columns, not the value it's represented.
@rxin I think that's a common problem if we want to passed a string literal
for DataFrame functions, do you have any suggestion for that?
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