Github user 3ourroom commented on a diff in the pull request:
https://github.com/apache/spark/pull/10220#discussion_r47612640
--- 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 --
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[email protected] ëê» ë³´ë´ì ë©ì¼ <Re: [spark]
[SPARK-12235][SPARKR] Enhance mutate() to support replace existing columns.
(#10220)> ì´ ë¤ìê³¼ ê°ì ì´ì ë¡ ì ì¡ ì¤í¨íìµëë¤.
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ë°ë ì¬ëì´ íìëì ë©ì¼ì ìì ì°¨ë¨ íììµëë¤.
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