Fix Oracle query limit compliance in Comments

Signed-off-by: Simounet <contact@simounet.net>

Author: Simounet

lib/private/Comments/Manager.php

@@ -634,27 +634,29 @@ public function getNumberOfCommentsForObject($objectType, $objectId, \DateTime $
 	 * @since 21.0.0
 	 */
 	public function getNumberOfUnreadCommentsForObjects(string $objectType, array $objectIds, IUser $user, $verb = ''): array {
-		$query = $this->dbConn->getQueryBuilder();
-		$query->select('c.object_id', $query->func()->count('c.id', 'num_comments'))
-			->from('comments', 'c')
-			->leftJoin('c', 'comments_read_markers', 'm', $query->expr()->andX(
-				$query->expr()->eq('m.user_id', $query->createNamedParameter($user->getUID())),
-				$query->expr()->eq('c.object_type', 'm.object_type'),
-				$query->expr()->eq('c.object_id', 'm.object_id')
-			))
-			->where($query->expr()->eq('c.object_type', $query->createNamedParameter($objectType)))
-			->andWhere($query->expr()->in('c.object_id', $query->createNamedParameter($objectIds, IQueryBuilder::PARAM_STR_ARRAY)))
-			->andWhere($query->expr()->orX(
-				$query->expr()->gt('c.creation_timestamp', 'm.marker_datetime'),
-				$query->expr()->isNull('m.marker_datetime')
-			))
-			->groupBy('c.object_id');
+		foreach (array_chunk($objectIds, 1000) as $chunk) {
+			$query = $this->dbConn->getQueryBuilder();
+			$query->select('c.object_id', $query->func()->count('c.id', 'num_comments'))
+				->from('comments', 'c')
+				->leftJoin('c', 'comments_read_markers', 'm', $query->expr()->andX(
+					$query->expr()->eq('m.user_id', $query->createNamedParameter($user->getUID())),
+					$query->expr()->eq('c.object_type', 'm.object_type'),
+					$query->expr()->eq('c.object_id', 'm.object_id')
+				))
+				->where($query->expr()->eq('c.object_type', $query->createNamedParameter($objectType)))
+				->andWhere($query->expr()->in('c.object_id', $query->createNamedParameter($chunk, IQueryBuilder::PARAM_STR_ARRAY)))
+				->andWhere($query->expr()->orX(
+					$query->expr()->gt('c.creation_timestamp', 'm.marker_datetime'),
+					$query->expr()->isNull('m.marker_datetime')
+				))
+				->groupBy('c.object_id');
+
+			if ($verb !== '') {
+				$query->andWhere($query->expr()->eq('c.verb', $query->createNamedParameter($verb)));
+			}
 
-		if ($verb !== '') {
-			$query->andWhere($query->expr()->eq('c.verb', $query->createNamedParameter($verb)));
+			$result = $query->execute();
 		}
-
-		$result = $query->execute();
 		$unreadComments = array_fill_keys($objectIds, 0);
 		while ($row = $result->fetch()) {
 			$unreadComments[$row['object_id']] = (int) $row['num_comments'];