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In commit 9df8f903e I (tgl) switched join_is_removable() from using the min relid sets of the join under consideration to using its full syntactic relid sets. This was a mistake, as it allowed join removal in cases where a reference to the join output would survive in some syntactically-lower join condition. Revert to the former coding. Richard Guo Discussion: https://postgr.es/m/CAMbWs4-EU9uBGSP7G-iTwLBhRQ=rnZKvFDhD+n+xhajokyPCKg@mail.gmail.com