332fdbef20
Andreas Seltenreich reports that it is possible for a PlaceHolderVar to creep into this tlist, and I fear that even after that's fixed we might have other, similar bugs in this area either now or in the future. There's a lot of action-at-a-distance here, because the validity of this assertion depends on core planner behavior; so, let's use elog() to make sure we catch this even in non-assert builds, rather than just crashing.
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