FrankChen021 commented on pull request #11809:
URL: https://github.com/apache/druid/pull/11809#issuecomment-947448538
Good idea. I think dot-sparated format for subQueryId might be more
readable, and this format have been widely used in many distributed tracing
systems.
Take your example, it would be
```
Parent Query: { queryId: "my-query-id", subQueryId: null }
Sub Query: { queryId: "my-query-id", subQueryId: "1" }
Sub Sub Query: { queryId: "my-query-id", subQueryId: "1.1" }
Sub Sub Query: { queryId: "my-query-id", subQueryId: "1.2" }
```
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