Promise.all structures produce unlinked spans

[wdalmut]

If i use a structure like

Promise.all([
  ModelName
  .find(where)
  .skip(0)
  .limit(25)
  .sort({ fieldName: 'asc' }),
  ModelName.countDocuments(where)
])

Spans are correctly generated but not linked with main root span (appears as two separated spans).

[wdalmut]

this issue is strange... Two spans are correctly generated but sadly with two completely different traceId

[wdalmut]

The problem seems related to Promise.all structure and promise concatenation

Product.find().then(...) // everything looks good

Promise.find().then(() => Product.countDocuments()).then(...) // 1 span only correctly linked with the root span 

Promise.all([Product.find(), Product.countDocuments()).then(...) // no span linked with root span

[wdalmut]

I found the same problem with the opentelemetry mysql-plugin open-telemetry/opentelemetry-js#940

[wdalmut]

This should be fixed by #34