Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12493#discussion_r60361260
--- Diff: R/pkg/R/DataFrame.R ---
@@ -1125,6 +1125,52 @@ setMethod("summarize",
agg(x, ...)
})
+#' dapply
+#'
+#' Apply a function to each partition of a DataFrame.
+#'
+#' @param x A DataFrame
+#' @param func A function to be applied to each partition of the DataFrame.
+#' @param schema Optional. The schema of the resulting DataFrame after the
function is applied.
+#' If NULL, the content of the resulting DataFrame is
serialized R data.
--- End diff --
Could you say a bit more about what the schema will be, and what operation
will be supported?
Since the serialization format is not known to user, how can user use it?
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