333     LogReaderThread* oldest = nullptr;  in Prune()  local
343         if (!oldest || oldest->start() > reader_thread->start() ||  in Prune()
344             (oldest->start() == reader_thread->start() &&  in Prune()
346             oldest = reader_thread.get();  in Prune()
364             if (oldest && oldest->start() <= element.sequence()) {  in Prune()
365                 KickReader(oldest, id, pruneRows);  in Prune()
444             if (oldest && oldest->start() <= element.sequence()) {  in Prune()
582         if (oldest && oldest->start() <= element.sequence()) {  in Prune()
583             if (!skipped_low_priority_prune) KickReader(oldest, id, pruneRows);  in Prune()
608             if (oldest && oldest->start() <= element.sequence()) {  in Prune()
609                 KickReader(oldest, id, pruneRows);  in Prune()