@Override
  public void createDatabase(String database) {
    metaStore.doAs(
        () -> {
          FileSystem fs = fs();
          fs.mkdirs(new Path(warehouse, database));
          return null;
        });
  }
Hudi catalog implement in hadoop filesystem.
amoro-format-hudi/src/main/java/org/apache/amoro/formats/hudi/HudiHadoopCatalog.java