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[SPARK-26681][SQL] Support Ammonite inner-class scopes. #23607

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Just for now

@@ -53,6 +53,12 @@ object OuterScopes {
val outer = outerScopes.get(outerClassName)
if (outer == null) {
outerClassName match {
case AmmoniteREPLClass(cellClassName) =>
() => {
val objClass = Utils.classForName(cellClassName)
val objInstance = objClass.getField("MODULE$").get(null)
// If the outer class is generated by REPL, users don't need to register it as it has
// only one instance and there is a way to retrieve it: get the `$read` object, call the
// `INSTANCE()` method to get the single instance of class `$read`. Then call `$iw()`
@@ -95,4 +101,8 @@ object OuterScopes {

// The format of REPL generated wrapper class's name, e.g. `$line12.$read$$iw$$iw`
private[this] val REPLClass = """^(\$line(?:\d+)\.\$read)(?:\$\$iw)+$""".r

// The format of ammonite REPL generated wrapper class's name,
// e.g. `ammonite.$sess.cmd8$Helper$Foo` -> `ammonite.$sess.cmd8.instance.Foo`
private[this] val AmmoniteREPLClass = """^(ammonite\.\$sess\.cmd(?:\d+)\$).*""".r
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