Do we want to share plans between call sites?
After thinking about this a little more, I think the answer is "no" -- it doesn't really buy us much, and introduces some extra complications (e.g. resource management).
BTW, it's quite annoying that the planner scribbles on its input. I've got half a mind to fix this before doing the rest of the cache invalidation work. That might be quite a large project, however...
-Neil
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