How do you control IMMUTABLE PG PROC results?

["Carlo Stonebanks" <stonec.register@xxxxxxxxxxxx>]

We have procs that would benefit from returning IMMUTABLE results. The procs 
are dependent on external tables that rarely change, but when they DO 
change, it would be great if we could expire the cache that the procs read 
from so that the procs are forced to re-evaluate the results.

Is this possible?

How do I know how many possible results are cached? 


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