As exhibited for instance here: http://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=spoonbill&dt=2015-05-16%2011%3A00%3A07 I've been able to replicate this on a Fedora 21 box: works fine with Python 2, fails with Python 3. Seems like we still have an issue with reliance on a system-provided sort method. regards, tom lane
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