Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> writes:
> I should to use a cache accessed via fn_extra. There will be stored data
> about function parameters (types). If I understand correctly, these data
> should be stable in query, and then recheck is not necessary. Is it true?
I wouldn't trust that. You don't really know what the lifespan of
a fn_extra cache is.
regards, tom lane