On 08/07/19 11:39, Tom Lane wrote: > Pavel Stehule <pavel.steh...@gmail.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.
It is going to be either the last thing I put there, or NULL, right? So a null check is sufficient? Other than when the SRF_* api has commandeered it for other purposes? Regards, -Chap