Github user sun-rui commented on a diff in the pull request: https://github.com/apache/spark/pull/12836#discussion_r65560574 --- Diff: core/src/main/scala/org/apache/spark/api/r/RRunner.scala --- @@ -149,12 +150,24 @@ private[spark] class RRunner[U]( dataOut.writeInt(numPartitions) - dataOut.writeInt(if (isDataFrame) 1 else 0) + val mode = if (isDataFrame && key != null) { + 2 // gapply + } else if (isDataFrame) { + 1 // dapply + } else { + 0 // RDD + } + dataOut.writeInt(mode) if (isDataFrame) { SerDe.writeObject(dataOut, colNames) } + // Write key - the grouping columns for gapply mode --- End diff -- remove this piece of code
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