Can anyone say whether this is a supported feature in plpgsql, and is safe to use? Is it simply undocumented, or am I just looking in the wrong place?
"iscachable" is only for backward compatibility - it's changed now to "IMMUTABLE"
You can read more about immutable, stable and volatile functions in Postgresql documentation - chapter SQL Commands/CREATE FUNCTION.
Regards, Tomasz Myrta
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