Github user shivaram commented on a diff in the pull request:
https://github.com/apache/spark/pull/8458#discussion_r38950081
--- Diff: core/src/main/scala/org/apache/spark/api/r/RBackendHandler.scala
---
@@ -171,35 +183,58 @@ private[r] class RBackendHandler(server: RBackend)
}.toArray
}
- // Checks if the arguments passed in args matches the parameter types.
- // NOTE: Currently we do exact match. We may add type conversions later.
+ // Find a matching method in all methods of the same name of a class
+ // according to the passed arguments. Arguments may be converted in
+ // order to match a method.
+ //
+ // Returns a two-element tuple. The first element is the index of
+ // the matched method in the list of the methods of the same name.
+ // The second element is the list of converted arguments.
def matchMethod(
- numArgs: Int,
- args: Array[java.lang.Object],
- parameterTypes: Array[Class[_]]): Boolean = {
- if (parameterTypes.length != numArgs) {
- return false
- }
+ parameterTypesOfMethods: Array[Array[Class[_]]],
+ args: Array[Object]): (Option[Int], Array[Object]) = {
+ val numArgs = args.length
+
+ for (index <- 0 to parameterTypesOfMethods.length - 1) {
+ val parameterTypes = parameterTypesOfMethods(index)
+
+ if (parameterTypes.length == numArgs) {
+ val convertedArgs = new Array[Object](numArgs)
--- End diff --
Is there any reason we shouldn't modify `args` in place and make a copy ?
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