public boolean isBaseStore(Table table) {
    return TablePropertyUtil.isBaseStore(table.properties(), TableFormat.MIXED_ICEBERG);
  }
check the given iceberg table is a base store for mixed-iceberg.

@param table iceberg table
@return base store of mixed-iceberg
amoro-format-iceberg/src/main/java/org/apache/amoro/mixed/MixedTables.java