protected static ObjectInspector[] initEvaluators(ExprNodeEvaluator<?>[] evals,
      ObjectInspector rowInspector) throws HiveException {
    ObjectInspector[] result = new ObjectInspector[evals.length];
    for (int i = 0; i < evals.length; i++) {
      result[i] = evals[i].initialize(rowInspector);
    }
    return result;
  }
Initialize an array of ExprNodeEvaluator and return the result
ObjectInspectors.
ql/src/java/org/apache/hadoop/hive/ql/exec/Operator.java