ModifyColumn.php

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<?php
namespace Magento\Framework\Setup\Declaration\Schema\Operations;

use Magento\Framework\Setup\Declaration\Schema\Db\DbSchemaWriterInterface;
use Magento\Framework\Setup\Declaration\Schema\Db\DefinitionAggregator;
use Magento\Framework\Setup\Declaration\Schema\Dto\Column;
use Magento\Framework\Setup\Declaration\Schema\ElementHistory;
use Magento\Framework\Setup\Declaration\Schema\OperationInterface;

class ModifyColumn implements OperationInterface
{
    const OPERATION_NAME = 'modify_column';

    private $definitionAggregator;

    private $dbSchemaWriter;

    public function __construct(
        DefinitionAggregator $definitionAggregator,
        DbSchemaWriterInterface $dbSchemaWriter
    ) {
        $this->definitionAggregator = $definitionAggregator;
        $this->dbSchemaWriter = $dbSchemaWriter;
    }

    public function getOperationName()
    {
        return self::OPERATION_NAME;
    }

    public function isOperationDestructive()
    {
        return false;
    }

    public function doOperation(ElementHistory $elementHistory)
    {
        $column = $elementHistory->getNew();

        $definition = $this->definitionAggregator->toDefinition($column);

        return [$this->dbSchemaWriter->modifyColumn(
            $column->getName(),
            $column->getTable()->getResource(),
            $column->getTable()->getName(),
            $definition
        )];
    }
}