cancancan with union join

[peterpengnz]

Hi
I am using cancancan and postgresql is the database.
For some reason, postgresql query planner doesn't use indexing when deal with left outer join with multiple OR conditions.
This leads signaficant performance issue and I found this issue has been noticed a while ago:
https://gist.github.com/coorasse/6324cbf8773260ea46195febbe45ab50
This is the gist coorasse created and that gist explains the exactly problem I am dealing with.

So I wonder whether cancancan plans to support union join or that issue is resolved already since gist was created in 2018?
Thank you