Provide a possibility for EntityQuery to provide new sort mappings

[StefanPenndorf]

Sometimes there should be special sorting logic associated. For example we provide a read only property/column for an optional @ManyToOne association. If only regular sorting is applied, hibernate will use a left join or cross join to retrieve the items which will skip those items where the property is not set (is null). This can be fixed by explicitly adding an outer join via criteria API.
Currently there is no way to do this in EntityQuery. Because the EntityQueryFactory is final and most of the relevant methods are final or private the only way to address this problem is copying the EntityQuery code which is cumbersome.

Solution: Provide a mechanism to influence or manipulate sorting applied.

[tlaukkan]

Hi, it would be much appreciated if you can contribute this behavior to LQC.