I am trying to create a module in which I am facing some issues to override Save.php Controller as well as save that data in the new table.

here is my updated di.xml code, but now after click on save, the redirect URL is blank.
<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="../../../../../lib/internal/Magento/Framework/ObjectManager/etc/config.xsd">
<preference for="Magento\Catalog\Controller\Adminhtml\Product\Attribute\Save" type="Lucent\LiTab\Controller\Adminhtml\Product\Attribute\Save" />
</config>
and my controller code for override is
<?php
/**
*
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Lucent\LiTab\Controller\Adminhtml\Product\Attribute;
class Save extends \Magento\Catalog\Controller\Adminhtml\Product\Attribute\Save
{
public function execute()
{
$data = $this->getRequest()->getPostValue();
print_r($data);
die();
}
}
So please let me know where I did wrong code.
Please give me a solution for this!
$this->getRequest()->getPostValue()field is gives your custom field value?