SqlCriteria - изменен расчет кол-ва записей при использовании GROUP BY

(In this thread: http://www.cyberforum.ru/mysql/thread681915.html
I have solution for my problem - USE COUNT(DISTINCT pid))

Model/SqlCriteria.php

@@ -84,15 +84,22 @@ class SqlCriteria
     {
 	    $this->defineJoinExpressions($select);
 	    $sql_expression_backup = $this->sql_expression;
+	    $group_by_backup = $this->group_by;
         $select_parent_query = 'COUNT(*) as count';
+	    $default_select = '*';
+	    if ($this->group_by) {
+		    $default_select = 'DISTINCT ' . $this->group_by[0];
+	    }
+	    $this->group_by = [];
         if (!$this->sql_expression) {
-            $this->sql_expression = 'SELECT COUNT(' . ($select ? $select : '*') . ') as count FROM :table';
+            $this->sql_expression = 'SELECT COUNT(' . ($select ? $select : $default_select) . ') as count FROM :table';
             $select_parent_query = 'x.count';
         } else {
-	        $this->sql_expression = preg_replace('#SELECT.+FROM#i', 'SELECT COUNT(' . ($select ? $select : '*') . ') as count FROM', $this->sql_expression);
+	        $this->sql_expression = preg_replace('#SELECT.+FROM#i', 'SELECT COUNT(' . ($select ? $select : $default_select) . ') as count FROM', $this->sql_expression);
         }
         $count = $this->model->count($select_parent_query, $this->where, null, $this->group_by, $this->sql_expression, $this->sql_expression_params)->fetchField('count');
         $this->sql_expression = $sql_expression_backup;
+	    $this->group_by = $group_by_backup;
 	    return $count;
     }