Move EEOP_*_SYSVAR evaluation out of line.
This mainly de-duplicates code. As evaluating a system variable isn't
the hottest path and the current inline implementation ends up calling
out to an external function anyway, this is OK from a performance POV.
The main motivation for de-duplicating is the upcoming slot
abstraction work, after which there's not guaranteed to be a HeapTuple
backing the slot.
Author: Andres Freund, Amit Khandekar
Discussion: https://postgr.es/m/
20181105210039.hh4vvi4vwoq5ba2q@alap3.anarazel.de
projects / postgresql / commit