DDC-3719: Criteria won't work on non-owning side of many to many collection

[doctrinebot]

Jira issue originally created by user baileylo:

I received the following error when trying to call matching on a ManyToMany relationship from the non-owning side.

{quote}
ErrorException in ManyToManyPersister.php line 234: Undefined index: relationToSourceKeyColumns
{quote}

ManyToManyPersister::loadCriteria relies on the relationToSourceKeyColumns data from the mapping data. This value is set in ClassMetadataInfo::_validateAndCompleteManyToManyMapping, but it's only set on the owning side of the relationship.

[doctrinebot]

• is referenced by DDC-3723: [GH-1399] Fix for DDC-3719.

[boesing]

Since PR #5638 was merged, when will this fix merged into 2.5 branch or will this be part of 2.6?
I am expiriencing this aswell and would love to use this fix.

Never mind, got the milestone 2.6, even if I am wondering why bugfixes are not merged into current branches.

[Ocramius]

@boesing it's up to the merger to decide whether a fix is worth backporting or not.