swift1911 commented on pull request #5002:
URL: https://github.com/apache/skywalking/pull/5002#issuecomment-652765815
> This thing is called `span layer`. There is no value for the local span.
>
> ```java
> public enum SpanLayer {
> DB(1), RPC_FRAMEWORK(2), HTTP(3), MQ(4), CACHE(5);
> }
> ```
Yes.There is no value for the local span.Do you think we should add a span
type for local span because there are many local span just like
SpringAsync,Shardingsphere shows unknown.
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