Expression.php

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<?php
namespace Magento\Framework\DB\Sql;

class Expression extends \Zend_Db_Expr implements ExpressionInterface, \JsonSerializable
{
    public function jsonSerialize()
    {
        return [
            'class' => static::class,
            'arguments' => [
                'expression' => $this->_expression,
            ],
        ];
    }
}