Unsurprisingly, commit 1ed6b8956 has led to the buildfarm's cross-version upgrade tests no longer working, eg
https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=tadarida&dt=2020-09-18%2013%3A06%3A52 Checking for reg* data types in user tables ok Checking for contrib/isn with bigint-passing mismatch ok Checking for user-defined postfix operators fatal Your installation contains user-defined postfix operators, which are not supported anymore. Consider dropping the postfix operators and replacing them with prefix operators or function calls. A list of user-defined postfix operators is in the file: postfix_ops.txt I intentionally let that happen, figuring that it'd be good to get some buildfarm cycles on the new code in pg_upgrade that does this check. But now we have to think about updating the test. I think the best bet is just to add some DROP OPERATOR commands to the existing cleanup logic in TestUpgradeXversion.pm. It looks like this would do the trick: drop operator #@# (bigint,NONE); drop operator #%# (bigint,NONE); drop operator !=- (bigint,NONE); drop operator #@%# (bigint,NONE); We could shorten this list a bit by changing create_operator.sql in the back branches --- most of these have no particular reason to be postfix rather than prefix operators. I would not want to remove them all, though, since that'd result in loss of test coverage for postfix operators in the back branches. regards, tom lane