333     LogReaderThread* oldest = nullptr;  in Prune()  local
341         if (!oldest || oldest->start() > reader_thread->start() ||  in Prune()
342             (oldest->start() == reader_thread->start() &&  in Prune()
344             oldest = reader_thread.get();  in Prune()
362             if (oldest && oldest->start() <= element.sequence()) {  in Prune()
363                 KickReader(oldest, id, pruneRows);  in Prune()
442             if (oldest && oldest->start() <= element.sequence()) {  in Prune()
580         if (oldest && oldest->start() <= element.sequence()) {  in Prune()
581             if (!skipped_low_priority_prune) KickReader(oldest, id, pruneRows);  in Prune()
606             if (oldest && oldest->start() <= element.sequence()) {  in Prune()
607                 KickReader(oldest, id, pruneRows);  in Prune()