Made addGroupBy varadic

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

lib/private/DB/QueryBuilder/QueryBuilder.php

@@ -835,12 +835,14 @@ class QueryBuilder implements IQueryBuilder {
 	 *         ->addGroupBy('u.createdAt')
 	 * </code>
 	 *
-	 * @param mixed $groupBy The grouping expression.
+	 * @param mixed ...$groupBy The grouping expression.
 	 *
 	 * @return \OCP\DB\QueryBuilder\IQueryBuilder This QueryBuilder instance.
 	 */
-	public function addGroupBy($groupBy) {
-		$groupBys = is_array($groupBy) ? $groupBy : func_get_args();
+	public function addGroupBy(...$groupBys) {
+		if (count($groupBys) === 1 && is_array($groupBys[0])) {
+			$$groupBys = $groupBys[0];
+		}
 
 		call_user_func_array(
 			[$this->queryBuilder, 'addGroupBy'],

lib/public/DB/QueryBuilder/IQueryBuilder.php

@@ -627,12 +627,12 @@ interface IQueryBuilder {
 	 *         ->addGroupBy('u.createdAt')
 	 * </code>
 	 *
-	 * @param mixed $groupBy The grouping expression.
+	 * @param mixed ...$groupBy The grouping expression.
 	 *
 	 * @return \OCP\DB\QueryBuilder\IQueryBuilder This QueryBuilder instance.
 	 * @since 8.2.0
 	 */
-	public function addGroupBy($groupBy);
+	public function addGroupBy(...$groupBy);
 
 	/**
 	 * Sets a value for a column in an insert query.