pgbench - allow empty queries

Fabien COELHO <coelho@cri.ensmp.fr> writes:

I wanted to test overheads on an empty query, but pgbench does not allow
it. I do not see why not.

I'm inclined to think this was probably a good thing before 9.6, as a
guard against accidentally writing an empty query into a script and
thus executing more queries than you meant to. However, with the new
end-of-command definition I think it's impossible to write an empty
query without an explicit ";", so it seems fine now. Pushed.

regards, tom lane

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