public String[] getFunctions() {
        return getFunctions(
                catalogManager.getCurrentCatalog(), catalogManager.getCurrentDatabase());
    }
@Test
    void testGetBuiltInFunctions() {
        Set<String> actual = new HashSet<>();
        Collections.addAll(actual, functionCatalog.getFunctions());

        Set<String> expected = new ModuleManager().listFunctions();

        assertThat(actual.containsAll(expected)).isTrue();
    }