Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/17825#discussion_r114366327
--- Diff: R/pkg/R/column.R ---
@@ -132,17 +132,24 @@ createMethods()
#' alias
#'
-#' Set a new name for a column
+#' Set a new name for an object. Equivalent to SQL "AS" keyword.
--- End diff --
right, this is Scala doc for Column.alias `Gives the column an alias`
(which is not very concise)
Dataset.alias `Returns a new Dataset with an alias set.`
I think we need to say `Set a new name to return as a new object` or
similar. Actually I think we should say "Column or SparkDataFrame" in place of
"object" - what do you think?
I think the `SQL "AS"` part but perhaps it will be more clear if lead with
"for Column, ..."?
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