Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/12493#discussion_r60858977
--- Diff: R/pkg/inst/worker/worker.R ---
@@ -100,7 +109,24 @@ if (isEmpty != 0) {
# Timing reading input data for execution
inputElap <- elapsedSecs()
- output <- computeFunc(partition, data)
+ if (isDataFrame) {
+ if (deserializer == "row") {
+ # Transform the list of rows into a data.frame
+ data <- do.call(rbind.data.frame, c(data, stringsAsFactors =
FALSE))
+ names(data) <- colNames
+ } else {
+ # Check to see if data is a valid data.frame
+ stopifnot(class(data) == "data.frame")
+ }
+ output <- computeFunc(data)
+ if (serializer == "row") {
+ # Transform the result data.frame back to a list of rows
+ output <- split(output, seq(nrow(output)))
+ }
--- End diff --
added assert
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