InstallSchema.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;

class InstallSchema implements InstallSchemaInterface
{
    public function install(SchemaSetupInterface $setup, ModuleContextInterface $context)
    {
        $installer = $setup;
        $installer->startSetup();
        $installer
            ->getConnection()
            ->modifyColumn('test_table', 'float', ['type' => 'float', 'default' => 25]);
        $installer->endSetup();
    }
}