nullIfMemDb      48253 ext/sqlite3/libsqlite/sqlite3.c SQLITE_PRIVATE const char *sqlite3PagerFilename(Pager *pPager, int nullIfMemDb){
nullIfMemDb      48254 ext/sqlite3/libsqlite/sqlite3.c   return (nullIfMemDb && pPager->memDb) ? "" : pPager->zFilename;