Andrew Gierth <and...@tao11.riddles.org.uk> writes: > My inclination is to fix this in the planner rather than the executor; > there seems no good reason to actually hash a duplicate column more than > once.
Sounds reasonable --- but would it make sense to introduce some
assertions, or other cheap tests, into the executor to check that
it's not being given a case it can't handle?
regards, tom lane
