Nullable.php

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<?php
namespace Magento\Framework\Setup\Declaration\Schema\Db\MySQL\Definition\Columns;

use Magento\Framework\Setup\Declaration\Schema\Db\DbDefinitionProcessorInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\Columns\ColumnNullableAwareInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\ElementInterface;

class Nullable implements DbDefinitionProcessorInterface
{
    public function toDefinition(ElementInterface $column)
    {
        if ($column instanceof ColumnNullableAwareInterface) {
            return $column->isNullable() ? 'NULL' : 'NOT NULL';
        }

        return '';
    }

    public function fromDefinition(array $data)
    {
        return $data;
    }
}