public boolean updateForComparison(ObjectInspector oi) throws UDFArgumentTypeException {
      return update(oi, ConversionType.COMPARISON);
    }
Update returnObjectInspector and valueInspectorsAreTheSame based on the
ObjectInspector seen for comparison (for example GenericUDFIn).

@return false if there is a type mismatch
ql/src/java/org/apache/hadoop/hive/ql/udf/generic/GenericUDFUtils.java