text: public static Collection<String> getNotSupportedFunctionNames() {Collection<String> lst = new TreeSet<>();for (int i = 0; i < functions.length; i++) {Function func = functions[i];if (func != null && (func instanceof NotImplementedFunction)) {FunctionMetadata metaData = FunctionMetadataRegistry.getFunctionByIndex(i);lst.add(metaData.getName());}}lst.remove("INDIRECT"); return Collections.unmodifiableCollection(lst);}