public static Mapper<List<List<Span>>, List<List<Span>>> filterTraces(QueryRequest request) {
    return new FilterTracesIfClashOnLowerTraceId(request);
  }
Filters the mutable input client-side when there's a clash on lower 64-bits of a trace ID.

@see FilterTraces
zipkin/src/main/java/zipkin2/storage/StrictTraceId.java