yii\db\mssql\QueryBuilder::getAllColumnNames PHP Method

    protected function getAllColumnNames($modelClass = null)
    {
        if (!$modelClass) {
            return null;
        }
        /* @var $model \yii\db\ActiveRecord */
        $model = new $modelClass();
        $schema = $model->getTableSchema();
        return array_keys($schema->columns);
    }