static Object getSingleCondnEvaluatorKey(Object o) {
    if (o instanceof SingleCondnEvaluator) {
      return ((SingleCondnEvaluator) o).condnKey;
    } else {
      throw new IllegalStateException(
          "The Object is not of type NotEqualConditionEvaluator");
    }
  }
Test function which retrieves the evaluated Key for a SingleCondnEvaluator operator

@param o Object of type SingleCondnEvaluator from which the set containing the keys for removal
       need to be retrieved
@return Object representing the evaluated Key
geode-core/src/main/java/org/apache/geode/cache/query/internal/RangeJunction.java