Needs approval from an approver in each of these files:
- ~~[OWNERS](https://github.com/milvus-io/pymilvus/blob/2.4/OWNERS)~~ [XuanYang-cn]
Approvers can indicate their approval by writing `/approve` in a comment
Approvers can cancel approval by writing `/approve cancel` in a comment
Also optinal variables default value should always be None. And empty str is always invalid variable
See also: #2327 pr: #2350