Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/12836#discussion_r64866724
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1268,6 +1268,82 @@ setMethod("dapplyCollect",
ldf
})
+#' gapply
+#'
+#' Apply a R function to each group of a DataFrame. The group is defined
by an input
--- End diff --
update comment:
Group the SparkDataFrame using the specified columns and apply the R
function to each group.
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