storage/tsdb/tsdb.go
func (s *ReadyStorage) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error) {
	if x := s.get(); x != nil {
		return x.Querier(ctx, mint, maxt)
	}
	return nil, ErrNotReady
}
func (s *ReadyStorage) Querier(ctx context.Context, mint, maxt int64) (storage.Querier, error) {
	if x := s.get(); x != nil {
		return x.Querier(ctx, mint, maxt)
	}
	return nil, ErrNotReady
}
// Querier implements the Storage interface.