private void checkErrorAndRethrow() {
    Throwable cause = failureThrowable.get();
    if (cause != null) {
      throw new RuntimeException("An error occurred in MixedFormatLookupFunction.", cause);
    }
  }
Check whether it is time to periodically load data to kvTable. Support to use {@link
Expression} filters to filter the data.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/lookup/BasicLookupFunction.java