public void init() {
    if (this.logDataToJsonConverter == null) {
      this.logDataToJsonConverter =
          LogDataToJsonConverters.createConverter(schema.asStruct(), fieldGetterFactory);
    }
  }
Object mapper that is used to create output JSON objects.
amoro-format-iceberg/src/main/java/org/apache/amoro/log/LogDataJsonSerialization.java