Reproducer of HHH-18236: Unrecognized enum discriminator with native query

[hibnico]

I have an error while trying to upgrade hibernate in my app, so I have opened HHH-18236 with a sample app reproducing the error. I tried to debug the issue, see my last comment in the issue. Not sure about how to debug more, I have made a unit test which show the bug in this PR. Most probably not a well coded test but I hope it can help fix the issue.

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[beikov]

Closing since this was fixed as part of https://hibernate.atlassian.net/browse/HHH-18515