@Override
    public CatalogFunction getFunction(ObjectPath functionPath)
            throws FunctionNotExistException, CatalogException {
        throw new FunctionNotExistException(getName(), functionPath);
    }
Append a new level to the base namespace
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/iceberg/src/main/java/org/apache/inlong/sort/iceberg/FlinkCatalog.java