What does RIR as in fireRIRrules stand for? - Mailing list pgsql-hackers

Hi,

I searched the current code, all diffs to the current code, and the
mailing list, but still haven't got an actual clue what RIR is supposed
to stand for. There's a few things that come to mind (Rewrite Instead
Rule?), but none of them seem to make too much sense.

Greetings,

Andres Freund