Schema manager should handle shard key on reference

[notrix]

Schema manager should also know how to handle shard key on reference
This PR is part of sharding key on reference fix. Referencing another PR #1687

[darceee2]

👍

[alcaeus]

See review below. Please note that the merge may take a few days (regardless of review issues) as I'm currently in the process of wrapping up the MongoDB driver switch and I don't want to endlessly rebase branches. Thanks for understanding.

[alcaeus]

@notrix after an eternity without updates, I finally managed to revisit this. I've created #1748 to fix this issue in the 1.2 branch, to be released in 1.2.2 soon.

I've rebased this branch on top of the current master to spare you the trouble - with the ext-mongodb and CS merges lots of things have changed. Due to the ext-mongodb change, sharding support in master is currently incomplete, so I've skipped the test for now. I'll revisit this in #1698 to work around the issues preventing finalizing this. Once #1748 has been merged, I'll also merge this branch down.

Thanks for your contribution! 🎉

Issues fixed

[stale]

This issue has been automatically marked as stale because it has not had any recent activity. It will be closed in a week if no further activity occurs. Thank you for your contributions.

[alcaeus]

FYI @notrix, I had to change this from desc to asc as the test failed with the error that the shard key would could only be ascending or hashed.