Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/10220#discussion_r61374122
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1451,17 +1451,54 @@ setMethod("mutate",
function(.data, ...) {
x <- .data
cols <- list(...)
- stopifnot(length(cols) > 0)
- stopifnot(class(cols[[1]]) == "Column")
+ if (length(cols) <= 0) {
+ return(x)
+ }
+
+ lapply(cols, function(col) {
+ stopifnot(class(col) == "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.
+
+ # For named arguments, use the names for arguments as the
column names
+ # For unnamed arguments, use the argument symbols as the
column names
+ args <- sapply(substitute(list(...))[-1], deparse)
--- End diff --
I did use cols. But the result is not correct. I have to use list(...)
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