Deserializer build() {
      return new Deserializer(schema, new ObjectInspectorPair(writerInspector, sourceInspector));
    }
Builder to create a Deserializer instance.
Requires an Iceberg Schema and the Hive ObjectInspector for converting the data.
iceberg/iceberg-handler/src/main/java/org/apache/iceberg/mr/hive/Deserializer.java