std::unordered_set<std::string>* filename_history,
int* options_files_count) {
std::vector<std::string> filenames;
std::unordered_set<std::string>* filename_history,
int* options_files_count) {
std::vector<std::string> filenames;
DB* db, const std::unordered_set<std::string>& past_filenames) {
std::vector<std::string> filenames;
std::unordered_set<std::string> current_filenames;
DB* db, const std::unordered_set<std::string>& past_filenames) {
std::vector<std::string> filenames;
std::unordered_set<std::string> current_filenames;