Github user retronym commented on a diff in the pull request:
https://github.com/apache/spark/pull/11410#discussion_r55785695
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/OuterScopes.scala
---
@@ -39,4 +41,47 @@ object OuterScopes {
def addOuterScope(outer: AnyRef): Unit = {
outerScopes.putIfAbsent(outer.getClass.getName, outer)
}
+
+ def getOuterScope(innerCls: Class[_]): AnyRef = {
+ assert(innerCls.isMemberClass)
+ val outerClassName = innerCls.getDeclaringClass.getName
+ val outer = outerScopes.get(outerClassName)
+ if (outer == null) {
+ outerClassName match {
+ // If the outer class is generated by REPL, users don't need to
register it as it has
+ // only one instance and there is a way to retrieve it: get the
`$read` object, call the
+ // `INSTANCE()` method to get the single instance of class
`$read`. Then call `$iw()`
+ // method multiply times to get the single instance of the inner
most `$iw` class.
+ case REPLClass(baseClassName) =>
+ val objClass = Utils.classForName(baseClassName + "$")
+ val objInstance = objClass.getField("MODULE$").get(null)
+ val baseInstance =
objClass.getMethod("INSTANCE").invoke(objInstance)
+ val baseClass = Utils.classForName(baseClassName)
+
+ var getter = iwGetter(baseClass)
+ var obj = baseInstance
+ while (getter != null) {
+ obj = getter.invoke(obj)
+ getter = iwGetter(getter.getReturnType)
+ }
+
--- End diff --
Yes, this looks cleaner to me.
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