BTW, while testing this patch I noticed that the error reports are
a tad redundant:
regression=# \set AUTOCOMMIT foo
unrecognized value "foo" for "AUTOCOMMIT": boolean expected
\set: error while setting variable
regression=#
The "error while setting variable" message seems entirely content-free.
I think we should drop that and instead establish a rule that SetVariable
should print a message for itself about any failure. (There are a lot
of call sites that don't check for or print a message, but that's only
because they aren't expecting failure. If one were to happen, printing
a message doesn't seem unreasonable.) That would in turn propagate into
an API requirement that var hooks that return FALSE are responsible for
printing a message about the reason, which is why it would be appropriate
to make that change as part of this patch.
Barring objections PDQ, I'll make this change.
regards, tom lane
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