How coud i get baggage in SpanExporter?

[mijingling]

Is your feature request related to a problem? Please describe.

I could get baggage in application, but i can't get baggage in SpanExporter
How coud i get baggage in SpanExporter?

get baggage in SpanExporter

public class MySpanExporter implements SpanExporter {
@OverRide
public CompletableResultCode export(Collection spans) {
String tradeCode = Baggage.current().getEntryValue("trade_code");
// but tradeCode is null , How coud i get baggage in SpanExporter?
return CompletableResultCode.ofSuccess();
}
...
}

thanks very much^^

[jkwatson]

Hi @mijingling . There is no way to get access to Baggage in an exporter. If you need to append Baggage entries to a Span, the best place for that is in a SpanProcessor, which does have access to the span's Context, and hence the Baggage.