"Florian G. Pflug" <[EMAIL PROTECTED]> writes:
> At least for me, the least surprising behaviour would be to
> revert it too. Than the rule becomes "a function is always
> executed in a pseudo-subtransaction that affects only GUCs"

Only if it has at least one SET clause.  The overhead is too high
to insist on this for every function call.

                        regards, tom lane

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