Finding the duration between 2 spans within the same trace

[lokesh411]

As far as i have read, we don't have a way to find the duration between startTimes of 2 child spans of a trace. The use case is, there are multiple operations within a trace and if we want to find the difference between start times of 2 operations (spans) if might be very useful. Correct me if this is already there
Thanks

[joe-elliott]

Unfortunately, this doesn't currently exist in TraceQL. I agree this could be useful but, in general, may be difficult to pull off.

What syntax do you think may be appropriate for a query like this?