Github user radek1st commented on the pull request:
https://github.com/apache/spark/pull/6332#issuecomment-104427195
I agree, it's no biggy, but the method signature says select(Column) and
not selectExpr(...), so the original comment doesn't seem valid on the first
sight. I'm still new to Spark so it's for you to decide, but I found it a bit
confusing
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