Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/10220#discussion_r47620558
--- 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)) {
--- End diff --
A DataFrame may have multiple columns of same name. This is mimic the
behavior of mutate() in dplyr: Throw error message when there are duplicated
column names in the DataFrame being mutated, even if the mutation is not
related to these columns of duplicated names.
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