Github user felixcheung commented on a diff in the pull request:
https://github.com/apache/spark/pull/10201#discussion_r47015981
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1324,12 +1312,16 @@ setMethod("selectExpr",
#' path <- "path/to/file.json"
#' df <- jsonFile(sqlContext, path)
#' newDF <- withColumn(df, "newCol", df$col1 * 5)
+#' # Replace an existing column
+#' newDF2 <- withColumn(newDF, "newCol", newDF$col1)
--- End diff --
I'm not 100% about the replace existing column behavior - I thought it was
intentional that we support multiple columns with the same name before?
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