protected static StructObjectInspector initEvaluatorsAndReturnStruct(
      ExprNodeEvaluator<?>[] evals, List<String> outputColName,
      ObjectInspector rowInspector) throws HiveException {
    ObjectInspector[] fieldObjectInspectors = initEvaluators(evals,
        rowInspector);
    return ObjectInspectorFactory.getStandardStructObjectInspector(
        outputColName, Arrays.asList(fieldObjectInspectors));
  }
Initialize an array of ExprNodeEvaluator and put the return values into a
StructObjectInspector with integer field names.
ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java