Type names with backslashes cause failing upgrades

[greg0ire]

I'm planning ahead and starting to use FQCNs as custom doctrine type getName implementation, as well as registering them under that name with Type::addType. Sadly, it seems SQL comments with backslashes are somehow not matched with the desired value, and the upgrade command fails with :

[Doctrine\DBAL\DBALException]                                                                                                                                                               
  Unknown column type "EMA\\MD\\Doctrine\\Type\\CountryType" requested. Any Doctrine type that you use has to be registered with \Doctrine\DBAL\Types\Type::addType(). You can get a list of  
   all the known types with \Doctrine\DBAL\Types\Type::getTypesMap(). If this error occurs during database introspection then you might have forgotten to register all database types for a   
  Doctrine Type. Use AbstractPlatform#registerDoctrineTypeMapping() or have your custom types implement Type#getMappedDatabaseTypes(). If the type name is empty you might have a problem wi  
  th the cache or forgot some mapping information. 

This is slightly different than what I described in doctrine/orm#6752 .

Here is the column comment I have:

| country_of_origin | character varying(255) |  not null   | extended  |         <null> | (DC2Type:EMA\\MD\\Doctrine\\Type\\CountryType)          |

[Majkl578]

Observed this as well, possibly platform-dependent (double-)quoting issue, needs investigation.

[ostrolucky]

Fixed by #3330

[github-actions]

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