protected function getRenamedIndexes()
    {
        $renamedIndexes = [];

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

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

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

        return $renamedIndexes;
    }