Stack trace:
from /srv/mediawiki/php-1.44.0-wmf.28/maintenance/purgeParserCache.php(113)
#0 /srv/mediawiki/php-1.44.0-wmf.28/maintenance/purgeParserCache.php(113): MediaWiki\Exception\MWExceptionHandler::handleError(int, string, string, int)
#1 /srv/mediawiki/php-1.44.0-wmf.28/includes/objectcache/SqlBagOStuff.php(1598): PurgeParserCache->showProgressAndWait(float)
#2 /srv/mediawiki/php-1.44.0-wmf.28/includes/objectcache/SqlBagOStuff.php(1491): SqlBagOStuff->deleteServerObjectsExpiringBefore(Wikimedia\Rdbms\DatabaseMySQL, int, float, int, array)
#3 /srv/mediawiki/php-1.44.0-wmf.28/includes/libs/objectcache/MultiWriteBagOStuff.php(316): SqlBagOStuff->deleteObjectsExpiringBefore(int, array, float, string)
#4 /srv/mediawiki/php-1.44.0-wmf.28/maintenance/purgeParserCache.php(104): Wikimedia\ObjectCache\MultiWriteBagOStuff->deleteObjectsExpiringBefore(int, array, float, string)
#5 /srv/mediawiki/php-1.44.0-wmf.28/maintenance/includes/MaintenanceRunner.php(694): PurgeParserCache->execute()
#6 /srv/mediawiki/php-1.44.0-wmf.28/maintenance/run.php(51): MediaWiki\Maintenance\MaintenanceRunner->run()
#7 /srv/mediawiki/multiversion/MWScript.php(221): require_once(string)
#8 {main}We get 300K in every run of purge parser cache (daily)