RelationOptionalFactory result = invokerAssistant.assistRelationOptionalFactory();
        assertNull(result);
    }

    // Test assistSqlAnalyzerFactory
    @Test
    public void test_assistSqlAnalyzerFactory() {
        SqlAnalyzerFactory result = invokerAssistant.assistSqlAnalyzerFactory();
        assertNull(result);
    }

    // Test assistFirstOutsideSqlOption with null table name
    @Test