Github user retronym commented on the pull request:
https://github.com/apache/spark/pull/11410#issuecomment-196676313
Since offering review, I've found a more direct way to get to the object.
```
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> $intp.isettings.unwrapStrings = false
$intp.isettings.unwrapStrings: Boolean = false
scala> var foo = ""
foo: String = ""
scala> foo = "2"
foo: String = 2
scala> val last = $intp.lastRequest
last: $intp.Request = Request(line=foo = "2", 1 trees)
scala> last.fullAccessPath
res1: String = $line4.$read.$iw.$iw
scala> val iw = $line4.$read.$iw.$iw
iw: $line4.$read.$iw.$iw.type = $line4.$read$$iw$$iw$@23444a36
scala>
iw.getClass.getMethods.find(_.getName.startsWith("$ires")).head.invoke(iw)
res2: Object = 2
scala> def nullIRes(x: Any) = { val cls = x.getClass;
cls.getDeclaredFields.filter(_.getName.startsWith("$ires")).foreach{fld =>
fld.setAccessible(true); fld.set(x, null)}}
nullIRes: (x: Any)Unit
scala> $intp.interpret(s"nullIRes(${last.fullAccessPath})")
res4: scala.tools.nsc.interpreter.IR.Result = Success
scala>
iw.getClass.getMethods.find(_.getName.startsWith("$ires")).head.invoke(iw)
res6: Object = null
```
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