private void waitForReturnSessionEvent() throws ExecutionException, InterruptedException {
    if (getReturnEventFuture() != null && !Thread.currentThread().isInterrupted()) {
      getReturnEventFuture().get();
    }
  }
Some context information that are required for rule evaluation.
ql/src/java/org/apache/hadoop/hive/ql/wm/WmContext.java