@Override
  protected boolean shouldWaitForMoreSplits() {
    return false;
  }
This is a static mixed-format source enumerator, used for bounded source scan. Working enabled
only just {@link ScanContext#STREAMING} is equal to false.
amoro-format-mixed/amoro-mixed-flink/amoro-mixed-flink-common/src/main/java/org/apache/amoro/flink/read/hybrid/enumerator/StaticMixedFormatSourceEnumerator.java