public Serde<SamzaSqlRelRecord> getSerde(String name, Config config) {
    return new SamzaSqlRelRecordSerde();
  }
A serializer for {@link SamzaSqlRelRecord}. This serializer preserves the type information as
{@link SamzaSqlRelRecord} and contains nested {@link SamzaSqlRelRecord}
records.
samza-sql/src/main/java/org/apache/samza/sql/serializers/SamzaSqlRelRecordSerdeFactory.java