Changed table collation does not trigger schema update when using doctrine:schema:update

[podorozhny]

Hello.

When I change table collation (using @ORM\Table annotation) - doctrine:schema:update do not update it. But if I do doctrine:schema:drop before update - it will update it.

Platform: postgres 9.6

[Ocramius]

Possibly related: #2551

[Tobion]

Ref. doctrine/orm#2988

[morozov]

Steps to reproduce:

$desiredTable = new Table('test', [new Column('id', new StringType())]);
$desiredTable->addOption('charset', 'utf8mb4');
$desiredTable->addOption('collate', 'utf8mb4_bin');

$sm = $connection->createSchemaManager();
$sm->dropAndCreateTable($desiredTable);

$desiredTable->addOption('collate', 'utf8mb4_unicode_ci');

$actualTable = $sm->listTableDetails('test');

$comparator = $sm->createComparator();
$diff = $comparator->diffTable($actualTable, $desiredTable);
var_dump($diff);
// false