Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/10220#discussion_r58296947
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1357,17 +1357,46 @@ setMethod("mutate",
function(.data, ...) {
x <- .data
cols <- list(...)
- stopifnot(length(cols) > 0)
+ if (length(cols) <= 0) {
+ return(x)
+ }
+
stopifnot(class(cols[[1]]) == "Column")
+
+ # Check if there is any duplicated column name in the DataFrame
+ dfCols <- columns(x)
+ if (length(unique(dfCols)) != length(dfCols)) {
+ stop("Error: found duplicated column name in the DataFrame")
+ }
+
+ # TODO: simplify the implementation of this method after
SPARK-12225 is resolved.
+
+ # The last column of the same name in the specific columns
takes effect
ns <- names(cols)
--- End diff --
isn't `ns` the same as `dfCols` above?
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