public ScalarUdf getOrCreateUdf(String clazz, String udfName, Context context) {
    return udfInstances.computeIfAbsent(udfName, s -> createInstance(clazz, udfName, context));
  }
The variable that are not shared among all cloned instance of {@link SamzaSqlExecutionContext}
samza-sql/src/main/java/org/apache/samza/sql/data/SamzaSqlExecutionContext.java