protected function initFilters()
    {
        $initColumnSearch = $this->initColumnSearch;
        foreach ($this->columns as $c) {
            if (isset($c['sqlFilter'])) {
                $where_condition = $this->generateSQLColumnFilter($this->toSQLColumn($c, 2), $c['sqlFilter']);
                if (!$this->setHaving($where_condition, $c)) {
                    $initColumnSearch[] = $this->generateSQLColumnFilter($this->toSQLColumn($c, 2), $c['sqlFilter']);
                }
            }
        }

        return implode(' AND ', $initColumnSearch);
    }