Github user JoshRosen commented on a diff in the pull request:
https://github.com/apache/spark/pull/12057#discussion_r57977229
--- Diff: core/src/main/scala/org/apache/spark/api/python/PythonRDD.scala
---
@@ -284,11 +292,22 @@ private[spark] class PythonRunner(
}
dataOut.flush()
// Serialized command:
- dataOut.writeInt(if (rowBased) 1 else 0)
- dataOut.writeInt(funcs.length)
- funcs.foreach { f =>
- dataOut.writeInt(f.command.length)
- dataOut.write(f.command)
+ if (isUDF) {
+ dataOut.writeInt(1)
+ dataOut.writeInt(funcs.length)
+ funcs.zip(numArgs).foreach { case (fs, numArg) =>
--- End diff --
Since correctness relies on `funcs.length == numArgs.length`, do you mind
adding a `require` at the start of the constructor to enforce this?
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