Github user sun-rui commented on a diff in the pull request:
https://github.com/apache/spark/pull/12836#discussion_r65563636
--- Diff: R/pkg/inst/worker/worker.R ---
@@ -84,68 +136,51 @@ broadcastElap <- elapsedSecs()
# as number of partitions to create.
numPartitions <- SparkR:::readInt(inputCon)
-isDataFrame <- as.logical(SparkR:::readInt(inputCon))
+# 0 - RDD mode, 1 - dapply mode, 2 - gapply mode
+mode <- SparkR:::readInt(inputCon)
-# If isDataFrame, then read column names
-if (isDataFrame) {
+if (mode > 0) {
colNames <- SparkR:::readObject(inputCon)
+ if (mode == 2) {
--- End diff --
grouping column names are not necessary
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