[cube2222]

Hey, two main use cases:

1. Find a trace where there is a span of type A with tag `xyz: true`, that has a direct child span of type B with tag `abc: 42`, that has at least one non-direct child span of type C with tag `lmn: forty-two`. So basically complex queries where I'm looking for a trace while making assertions about tags in different spans, possibly spans that are very far from each other in the trace (non-direct child, just joining on trace_id in that case, not child.parent_id = parent.span_id).

2. Analytical performance analysis across all spans of a certain type in a specified time span (a week for example). I have spans of type A, each of these spans has multiple children of type B, now I want to make some calculations involving the duration of A, the count of B, durations of B, and then slice and dice (group by) this by specific tags in those spans.

[ramonguiu]

Thanks for sharing. Makes total sense. As soon as you have to query across span attributes AND span parent/child relationships you need a more sophisticated query language.