Yep, the variable value must be rolled back, I think.
Attention! rollback is significantly expensive than RESET.
I'm quite unclear about the difference... Transactional for an unshared
only-in-memory session object is probably easy to implement, no WAL is
needed... So I do not see the difference.
There are no any product where variables are transactional - we should not
to create wheel.
Well, AFAICS PostgreSQL GUCs are transactional.
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