protected function getRenamedColumns()
    {
        $renamedColumns = [];

        foreach ($this->tableArr['columns'] as $column) {
            $oldName = $column['oldName'];

            // make sure this is an existing column and not a new one
            if ($this->originalTable->hasColumn($oldName)) {
                $name = $column['name'];

                if ($name != $oldName) {
                    $renamedColumns[$oldName] = $name;
                }
            }
        }

        return $renamedColumns;
    }