[7.x] Run pagination count as subquery for group by and havings (#32624)

Run pagination count as subquery for group by and havings

src/Illuminate/Database/Query/Builder.php

@@ -2238,9 +2238,7 @@ public function getCountForPagination($columns = ['*'])
         // Once we have run the pagination count query, we will get the resulting count and
         // take into account what type of query it was. When there is a group by we will
         // just return the count of the entire results set since that will be correct.
-        if (isset($this->groups)) {
-            return count($results);
-        } elseif (! isset($results[0])) {
+        if (! isset($results[0])) {
             return 0;
         } elseif (is_object($results[0])) {
             return (int) $results[0]->aggregate;
@@ -2257,6 +2255,15 @@ public function getCountForPagination($columns = ['*'])
      */
     protected function runPaginationCountQuery($columns = ['*'])
     {
+        if ($this->groups || $this->havings) {
+            $clone = $this->cloneForPaginationCount();
+
+            return [(object) ['aggregate' => $this->newQuery()
+                        ->from(new Expression('('.$clone->toSql().') as '.$this->grammar->wrap('aggregate_table')))
+                        ->mergeBindings($clone)
+                        ->count(['*']), ]];
+        }
+
         $without = $this->unions ? ['orders', 'limit', 'offset'] : ['columns', 'orders', 'limit', 'offset'];
 
         return $this->cloneWithout($without)
@@ -2265,6 +2272,17 @@ protected function runPaginationCountQuery($columns = ['*'])
                     ->get()->all();
     }
 
+    /**
+     * Clone the existing query instance for usage in a pagination subquery.
+     *
+     * @return self
+     */
+    protected function cloneForPaginationCount()
+    {
+        return $this->cloneWithout(['orders', 'limit', 'offset'])
+                    ->cloneWithoutBindings(['order']);
+    }
+
     /**
      * Remove the column aliases since they will break count queries.
      *