@Override
  protected boolean isEmptyCommit() {
    applyDeleteExpression();
    return deleteFiles.isEmpty()
        && addFiles.isEmpty()
        && deleteDeleteFiles.isEmpty()
        && addDeleteFiles.isEmpty()
        && partitionOptimizedSequence.isEmpty();
  }
Update optimized sequence for changed partitions. The files of ChangeStore whose sequence is
bigger than optimized sequence should migrate to BaseStore later.

@param sequence - optimized sequence
@return this for chain
amoro-format-iceberg/src/main/java/org/apache/amoro/op/OverwriteBaseFiles.java