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9a2dbc614e
A placeholder that references the outer join's relid in ph_eval_at is logically "above" the join, and therefore we can't remove its PlaceHolderInfo: it might still be used somewhere in the query. This was not an issue pre-v16 because we failed to remove the join at all in such cases. The new outer-join-aware-Var infrastructure permits deducing that it's okay to remove the join, but then we have to clean up correctly afterwards. Report and fix by Richard Guo Discussion: https://postgr.es/m/CAMbWs4_tuVn9EwwMcggGiZJWWstdXX_ci8FeEU17vs+4nLgw3w@mail.gmail.com