MigrateDataFrom.php

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<?php
declare(strict_types=1);

namespace Magento\Framework\Setup\Declaration\Schema\Db\MySQL\DDL\Triggers;

use Magento\Framework\App\ResourceConnection;
use Magento\Framework\DB\Sql\Expression;
use Magento\Framework\Setup\Declaration\Schema\Db\DDLTriggerInterface;
use Magento\Framework\Setup\Declaration\Schema\Dto\Column;
use Magento\Framework\Setup\Declaration\Schema\ElementHistory;

class MigrateDataFrom implements DDLTriggerInterface
{
    const MATCH_PATTERN = '/migrateDataFrom\(([^\)]+)\)/';

    private $resourceConnection;

    public function __construct(ResourceConnection $resourceConnection)
    {
        $this->resourceConnection = $resourceConnection;
    }

    public function isApplicable(string $statement) : bool
    {
        return (bool) preg_match(self::MATCH_PATTERN, $statement);
    }

    public function getCallback(ElementHistory $columnHistory) : callable
    {
        $column = $columnHistory->getNew();
        preg_match(self::MATCH_PATTERN, $column->getOnCreate(), $matches);
        return function () use ($column, $matches) {
            $tableName = $column->getTable()->getName();
            $adapter = $this->resourceConnection->getConnection(
                $column->getTable()->getResource()
            );
            $adapter
                ->update(
                    $this->resourceConnection->getTableName($tableName),
                    [
                        $column->getName() => new Expression($matches[1])
                    ]
                );
        };
    }
}