UpgradeSchema.php

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<?php
namespace Magento\TestSetupDeclarationModule7\Setup;

use Magento\Framework\Setup\InstallSchemaInterface;
use Magento\Framework\Setup\ModuleContextInterface;
use Magento\Framework\Setup\SchemaSetupInterface;
use Magento\Framework\Setup\UpgradeSchemaInterface;

class UpgradeSchema implements UpgradeSchemaInterface
{
    public function upgrade(SchemaSetupInterface $setup, ModuleContextInterface $context)
    {
        $installer = $setup;
        $installer->startSetup();

        if (version_compare($context->getVersion(), '2.0.1') < 0) {
            $installer
                ->getConnection()
                ->modifyColumn('test_table', 'float', ['type' => 'float', 'default' => 29]);
        }

        $installer->endSetup();
    }
}