Blob.php

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<?php
namespace Magento\Framework\Setup\Declaration\Schema\Dto\Columns;

use Magento\Framework\Setup\Declaration\Schema\Dto\Column;
use Magento\Framework\Setup\Declaration\Schema\Dto\ElementDiffAwareInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\Table;

class Blob extends Column implements
    ElementDiffAwareInterface,
    ColumnNullableAwareInterface
{
    private $nullable;

    public function __construct(
        string $name,
        string $type,
        Table $table,
        bool $nullable = true,
        string $comment = null,
        string $onCreate = null
    ) {
        parent::__construct($name, $type, $table, $comment, $onCreate);
        $this->nullable = $nullable;
    }

    public function isNullable()
    {
        return $this->nullable;
    }

    public function getDiffSensitiveParams()
    {
        return [
            'type' => $this->getType(),
            'nullable' => $this->isNullable(),
            'comment' => $this->getComment()
        ];
    }
}