@Override
  public KV<Object, Object> convertToSamzaMessage(SamzaSqlRelMessage relMessage) {
    Schema payloadSchema = computePayloadSchema(streamName, relMessage);
    return convertToSamzaMessage(relMessage, payloadSchema);
  }
Special form for AvroRelConverter that generates the avro schema on the output based on the
fields in {@link SamzaSqlRelMessage} and uses the schema to serialize the output.
This is useful to test out the SQL quickly when the destination system supports Avro serialized data,
without having to manually author the avro schemas for various SQL queries.
samza-tools/src/main/java/org/apache/samza/tools/avro/AvroSchemaGenRelConverter.java