@Override
  protected MixedTables newMixedTables(
      TableMetaStore metaStore, Map<String, String> catalogProperties, Catalog icebergCatalog) {
    return new InternalMixedTables(
        metaStore, catalogProperties, icebergCatalog, tableStoreSeparator());
  }
Mixed-iceberg format catalog base on internal catalog.
amoro-format-iceberg/src/main/java/org/apache/amoro/mixed/InternalMixedIcebergCatalog.java