HyukjinKwon commented on a change in pull request #27278:
[SPARK-30569][SQL][PYSPARK][SPARKR] Add percentile_approx DSL functions.
URL: https://github.com/apache/spark/pull/27278#discussion_r368345690
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File path: R/pkg/R/functions.R
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@@ -1332,6 +1332,48 @@ setMethod("quarter",
column(jc)
})
+#' @details
+#' \code{percentile_approx} Returns the approximate percentile value of
+#' numeric column at the given percentage.
+#'
+#' @param percentage numeric percentage at which percentile should be computed
+#' All values should be between 0 and 1.
+#' If length equals to 1 resulting column is of type double,
+#' otherwise array<double>/
+#' @param accuracy parameter (default: 10000) is a positive numeric literal
which
+#' controls approximation accuracy at the cost of memory. Higher value of
accuracy
+#' yields better accuracy, 1.0/accuracy is the relative error of the
approximation.
+#'
+#' @rdname column_aggregate_functions
+#' @aliases percentile_approx percentile_approx,Column-method
+#' @note percentile_approx since 3.0.0
+setMethod("percentile_approx",
+ signature(x = "characterOrColumn", percentage = "numeric", accuracy
= "numeric"),
+ function(x, percentage, accuracy) {
Review comment:
This way is more consistent and you can only define one method.
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