public long getRawDataSerializedSize() {
      return serializedSize;
    }
Get the field out of the row without checking parsed. This is called by
both getField and getFieldsAsList.

@param fieldID
         The id of the field starting from 0.
@return The value of the field
serde/src/java/org/apache/hadoop/hive/serde2/lazybinary/LazyBinaryUnion.java