code: static SelectTraceIdsFromSpan.Factory initialiseSelectTraceIdsFromSpan(Session session) {
      try {
        return new SelectTraceIdsFromSpan.Factory(session);
      } catch (DriverException ex) {
        LOG.warn("failed to prepare annotation_query index statements: " + ex.getMessage());
        return null;
      }
    }
docs: This makes it possible to safely drop the annotations_query SASI.
  
  <p>If dropped, trying to search by annotation in the UI will throw an IllegalStateException.