clear function cache (WAS: SQL function inlining)

* Tom Lane <tgl@sss.pgh.pa.us> wrote:

<big_snip>

BTW: is it possible to explicitly clear the cache for immutable
functions ?

I'd like to use immutable functions for really often lookups like
fetching a username by uid and vice versa. The queried tables
change very rarely, but when they change is quite unpredictable.


thx
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