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856aad92ef
* Update OTLP SpanData transform
The ParentSpanId needs to be empty for root spans according to the OTLP
[docs](6c2a86ed2f/gen/go/trace/v1/trace.pb.go (L284-L286)).
This updates the SpanData transform function to not add the ParentSpanID
if it is not a valid span ID (which includes if it is the nil span ID
used for an unset ID).
Additionally, this adds a test to prevent regression.
* Simplify test to just check parent span ID transform
Co-authored-by: Rahul Patel <rahulpa@google.com>