public FunctionInfo registerUDF(String functionName,
                                  Class<? extends UDF> UDFClass, boolean isOperator, String displayName) {
      FunctionType functionType = isNative ? FunctionType.BUILTIN : FunctionType.TEMPORARY;
      return registerUDF(functionName, functionType, UDFClass, isOperator, displayName);
  }
@deprecated From next release, replaced by {@link #registerUDF(String, Class, boolean, String)}
Deprecated because method unnecessarily accepts FunctionResource vararg param
ql/src/java/org/apache/hadoop/hive/ql/exec/Registry.java