Ever since 27b62377b47f9e7bf58613, I have been getting "ERROR: mergejoin input data is out of order" for the attached reproducer.
I get this on Ubuntu 20.04 and 22.04, whether initdb was run under LC_ALL=C or under LANG=en_US.UTF-8.
It is not my query, I don't really know what its point is. I just got this error while looking into the performance of it and accidentally running it against 16dev.
Cheers,
Jeff