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b84a6dafbf
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