Collection.php

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<?php
namespace Magento\User\Model\ResourceModel\User;

class Collection extends \Magento\Framework\Model\ResourceModel\Db\Collection\AbstractCollection
{
    protected function _construct()
    {
        $this->_init(\Magento\User\Model\User::class, \Magento\User\Model\ResourceModel\User::class);
    }

    protected function _initSelect()
    {
        parent::_initSelect();
        $this->getSelect()->joinLeft(
            ['user_role' => $this->getTable('authorization_role')],
            'main_table.user_id = user_role.user_id AND user_role.parent_id != 0',
            []
        )->joinLeft(
            ['detail_role' => $this->getTable('authorization_role')],
            'user_role.parent_id = detail_role.role_id',
            ['role_name']
        );
    }
}