DDC-3130: [GH-1033] [WIP] Lazy criteria for ManyToMany collection

[doctrinebot]

Jira issue originally created by user @doctrinebot:

This issue is created automatically through a Github pull request on behalf of bakura10:

Url: #1033

Message:

This continues my previous work on making Criteria most efficient.

Currently we are wrapping matching calls on repositories and matching calls on EXTRA_LAZY associations around a LazyCriteria. However, ManyToMany are still completely loaded: https://github.com/doctrine/doctrine2/blob/master/lib/Doctrine/ORM/PersistentCollection.php#L874

This is still problematic from a performance point of view because count, contains... cannot be optimized. I think the solution is similar to previous one, hence creating a Lazy collection for that kind of associations.

However, this is really tricky to do because of the whole mess inside the persisters (can't wait for them to be completely refactored, it's getting really hard to maintain this mess :p).

[doctrinebot]

• is referenced by DDC-2535: [GH-712] Extra lazy get for inverse side of many-to-many

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1033] was assigned:
#1033

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1033] was labeled:
#1033

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1033] was labeled:
#1033

[doctrinebot]

Comment created by @doctrinebot:

A related Github Pull-Request [GH-1033] was unlabeled:
#1033