Merge pull request yajra#243 from lisa-fehr/patch-3

count method needs to check for distinct as well as union

Author: yajra

src/yajra/Datatables/Datatables.php

@@ -327,9 +327,9 @@ private function count()
     {
         $query = $this->query;
 
-        // if its a normal query ( no union ) replace the select with static text to improve performance
+        // if its a normal query ( no union, having or distinct ) replace the select with static text to improve performance
         $myQuery = clone $query;
-        if (! preg_match('/UNION/i', strtoupper($myQuery->toSql()))) {
+        if ( ! Str::contains(Str::lower($myQuery->toSql()), ['union', 'having', 'distinct'])) {
             $myQuery->select($this->connection->raw("'1' as row_count"));
         }