Github user liancheng commented on the issue:
https://github.com/apache/spark/pull/13972
@yinxusen Thanks for the review! Also discussed with @mengxr. IIUC,
overlapped labels is most useful for handling imports, since sometimes we may
want to include one import line in multiple example snippet blocks. Regarding
to this issue, I have two concerns:
1. It's a rare case, and we possibly can workaround this case while
authoring documentations. Thus I guess we can do it in a follow-up PR.
2. Instead of overlapped labels, I'd prefer a multi-label approach:
```scala
// $example on:A$
import org.examples.A
// $example off:A$
// $example on:A:B$
import org.examples.common._
// $example off:A:B$
// $example on:B$
import org.examples.B
// $example off:B$
```
This approach achieves the same goal, and is much simpler to implement
than handling overlapped scoping.
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