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what a Var node refers to. This is no longer necessary because the new flat-range-table representation of plan trees makes it relatively easy to dig down through child plan levels to find the original reference; and to keep doing it that way, we'd have to store joinaliasvars lists in flattened RTEs, as demonstrated by bug report from Leszek Trenkner. This change makes varnoold/varoattno truly just debug aids, which wasn't quite the case before. Perhaps we should drop them, or only have them in assert-enabled builds?