Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/10309#discussion_r47744498
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1575,6 +1575,36 @@ setMethod("where",
filter(x, condition)
})
+#' dropDuplicates
+#'
+#' Returns a new DataFrame with duplicate rows removed, considering only
+#' the subset of columns.
+#'
+#' @param x A DataFrame.
+#' @param colnames A character vector of column names.
+#' @return A DataFrame with duplicate rows removed.
+#' @family DataFrame functions
+#' @rdname dropduplicates
+#' @name dropDuplicates
+#' @export
+#' @examples
+#'\dontrun{
+#' sc <- sparkR.init()
+#' sqlContext <- sparkRSQL.init(sc)
+#' path <- "path/to/file.json"
+#' df <- read.json(sqlContext, path)
+#' dropDuplicates(df)
+#' dropDuplicates(df, c("col1", "col2"))
+#' }
+setMethod("dropDuplicates",
+ signature(x = "DataFrame"),
--- End diff --
This is for the default argument. If adding colNames = "character" to the
signature, no way to specify the argument.
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