The objectid is a string

This allows the query to use the index. Else it has to resort on
scanning all the rows.

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

lib/private/SystemTag/SystemTagObjectMapper.php

@@ -78,7 +78,7 @@ class SystemTagObjectMapper implements ISystemTagObjectMapper {
 			->from(self::RELATION_TABLE)
 			->where($query->expr()->in('objectid', $query->createParameter('objectids')))
 			->andWhere($query->expr()->eq('objecttype', $query->createParameter('objecttype')))
-			->setParameter('objectids', $objIds, IQueryBuilder::PARAM_INT_ARRAY)
+			->setParameter('objectids', $objIds, IQueryBuilder::PARAM_STR_ARRAY)
 			->setParameter('objecttype', $objectType)
 			->addOrderBy('objectid', 'ASC')
 			->addOrderBy('systemtagid', 'ASC');