ericm-db commented on PR #50611:
URL: https://github.com/apache/spark/pull/50611#issuecomment-2811867503

   The crux of the issue is that in a test we do the following:
   ```
     override def init(
         outputMode: OutputMode,
         timeMode: TimeMode): Unit = {
       _mapState = getHandle
         .getMapState("mapState", Encoders.STRING, Encoders.scalaInt, ttlConfig)
         .asInstanceOf[MapStateImplWithTTL[String, Int]]
     }
     ```
   where we fetch MapState and cast it to MapStateImplWithTTL. 
MapStateImplWithTTL is not a private class, so this is technically allowed 
behavior, but since InvalidHandleMapState does not inherit or extend the Impl 
class, this throws an error. 


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