Symfony/Doctrine keeps creating the same migration - php

Question

Edit: Turns out other projects on the same machine are having the same issue. The question is for one specific project:
I have a Symfony4 project in which I have a few entities (created via make:entity). I just noticed that the last 4 migrations have the exact same query in them (and yes, I run migrations in between). Example:
$this->addSql('ALTER TABLE event CHANGE visible_from visible_from DATETIME DEFAULT NULL, CHANGE visible_till visible_till DATETIME DEFAULT NULL, CHANGE max_signups max_signups INT DEFAULT NULL');
I ran that query manually and that actually updated the table. I then created a new migration to test: The above query was there, again.
I've cleared cache, ran doctrine:cache:clear-metadata, double checked for weird stuff, but everything is normal.
I have the same 3 queries every time and they all have one thing in common: They have nullable=true. All other entities do not have nullable=true in them.
/**
* #ORM\Column(type="integer", nullable=true)
*/
private $maxSignups;
The downmigration might be a hint:
ALTER TABLE event CHANGE visible_from visible_from DATETIME DEFAULT \'NULL\',
This I find odd---^
MariaDB version: 10.2.14
PHP: 7.2.4
symfony/orm-pack: "^1.0"
Anyone who knows why?

Answer 1

I still dont really know why ( So I'll leave this question open for a bit), but this is what I did:
I was running both MySQL and MariaDB and it defaulted to MySQL. Turned that off, switched to MariaDB and adding a version in doctrine.yaml:
doctrine:
dbal:
# configure these for your database server
driver: 'pdo_mysql'
server_version: 'mariadb-10.2.14'
It doesnt really care about the version though. I made a typo and wrote 12.2.14 and it worked absolutally fine. I'm guessing it has a version>$n check somewhere.

Answer 2

Everything is explained here:
https://github.com/symfony/symfony-docs/pull/9547#issue-179389686
The most important is setting server_version with prefix "mariadb", the MariaDB version is less important.
Alternatively, you may not set server_version at all, then it should be detected automatically.
Below is the DBAL driver function responsible for parsing server_version:
public function createDatabasePlatformForVersion($version)
{
$mariadb = false !== stripos($version, 'mariadb');
if ($mariadb && version_compare($this->getMariaDbMysqlVersionNumber($version), '10.2.7', '>=')) {
return new MariaDb1027Platform();
}
if ( ! $mariadb && version_compare($this->getOracleMysqlVersionNumber($version), '5.7.9', '>=')) {
return new MySQL57Platform();
}
return $this->getDatabasePlatform();
}
And here is the link to the whole class: https://github.com/doctrine/dbal/blob/f76bf5ef631cec551a86c2291fc749534febebf1/lib/Doctrine/DBAL/Driver/AbstractMySQLDriver.php#L133