===== Condition 序列化后的结果 =====
<code>
    ConditionSpec s = new ConditionSpec();
    s.addConditionsItem(
        new Condition()
            .columnId(t1_colId0)
            .operator(ConditionOperator.EQ)
            .valueColumnId(t2_colId2));
    assertEquals(EntitySerializer.get().serialize(s), "");
</code>

===== 开启 debug 日志 =====
修改 skaffold/local.env，最后面加入：
<code>
logging.level.root=DEBUG
</code>