Github user felixcheung commented on the pull request:
https://github.com/apache/spark/pull/9680#issuecomment-157975716
As per thisÂ
https://stat.ethz.ch/R-manual/R-devel/library/stats/html/cor.html
It support "vector, matrix or data frame", and it doesn't say a subset of a
data frame.
I'm not sure a column in a data frame is like a vector?
Instead, I think #9366 should support 2 DataFrames. And we should come up
with a signature similar to stats::cor
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