Github user yu-iskw commented on a diff in the pull request:
https://github.com/apache/spark/pull/8266#discussion_r37370384
--- Diff: R/pkg/R/functions.R ---
@@ -163,3 +163,18 @@ setMethod("n", signature(x = "Column"),
function(x) {
count(x)
})
+
+#' when
+#'
+#' Evaluates a list of conditions and returns one of multiple possible
result expressions.
+#' If otherwise is not defined at the end, null is returned for unmatched
conditions.
+#'
+#' @rdname column
+#' @aliases otherwise
+setMethod("when", signature(x = "Column", y = "ANY"),
--- End diff --
As you said, we don't need `when` in `column.R`. I'll remove it.
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