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Specifically, pass the outer plan's PlanState instead of our own PlanState. At present, ExecContextForcesOids doesn't actually care which PlanState we pass; it just looks through to the underlying EState to find the result relation or top-level eflags. However, in the future it might care. If that happens, and if our goal is to get a tuple descriptor that matches that of the outer plan, then I think what we care about is whether the outer plan's context forces OIDs, rather than whether our own context forces OIDs, just as we use the outer node's target list rather than our own. Patch by me, reviewed by Amit Kapila. Discussion: http://postgr.es/m/CA+TgmoZ0ZL=cesZFq8c9NnfK6bqy-wwUd3_74iYGodYrSoQ7Fw@mail.gmail.com
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