Github user retronym commented on a diff in the pull request:
https://github.com/apache/spark/pull/11410#discussion_r54557328
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/encoders/OuterScopes.scala
---
@@ -39,4 +41,35 @@ object OuterScopes {
def addOuterScope(outer: AnyRef): Unit = {
outerScopes.putIfAbsent(outer.getClass.getName, outer)
}
+
+ def getOuterScope(innerCls: Class[_]): AnyRef = {
+ assert(innerCls.isMemberClass)
+ val outerCls = innerCls.getDeclaringClass.getName
+ val outer = outerScopes.get(outerCls)
+ if (outer == null) {
+ outerCls match {
+ case REPLClass(line) =>
+ val loader = Utils.getContextOrSparkClassLoader
+ def loadCls(clsName: String): Class[_] = Class.forName(clsName,
true, loader)
+
+ val cls1 = loadCls(line + "$read$")
+ val obj1 = cls1.getField("MODULE$").get(null)
+
+ val obj2 = cls1.getMethod("INSTANCE").invoke(obj1)
+ val cls2 = loadCls(line + "$read")
+
+ val obj3 = cls2.getMethod("$iw").invoke(obj2)
+ val cls3 = loadCls(line + "$read$$iw")
+
+ cls3.getMethod("$iw").invoke(obj3)
+
+ case _ => null
+ }
+ } else {
+ outer
+ }
+ }
+
+ // The format of REPL generated wrapper class's name, e.g.
`$line12.$read$$iw$$iw`
--- End diff --
The assumption is incorrect. Additional nested `iw` names are needed to
typecheck when previous lines include imports.
```
â¡ (export X='getClass.getName.mkString("\u200B")'; printf "$X\n$X\nval
foo = 0\nimport foo._\n$X\n" | scala -Yrepl-class-based)
Welcome to Scala 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_71).
Type in expressions for evaluation. Or try :help.
scala> getClass.getName.mkString("")
res0: String = $line3.$read$$iw$$iw
scala> getClass.getName.mkString("")
res1: String = $line4.$read$$iw$$iw
scala> val foo = 0
foo: Int = 0
scala> import foo._
import foo._
scala> getClass.getName.mkString("")
res2: String = $line10.$read$$iw$$iw$$iw$$iw
scala> :quit
```
Re running this with `-Xprint-parser` helps see the structure.
Note that the REPL strips `$iw.` from output. I've inserted zero-width
spaces into the strings to be able to see them.
You can disable this feature programmatically:
```
scala> $intp.isettings.unwrapStrings = false
$intp.isettings.unwrapStrings: Boolean = false
scala> getClass.getName
res2: String = $line7.$read$$iw$$iw$
```
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