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These tests provide coverage for RangeTblEntry and how query jumbling works with search_path, as well as the case where relations are re-created, generating a different query ID as the relation OID is used in the computation. A patch is under discussion to switch to a different approach based on the relation name, and there was no test coverage for this area, including how queries are currently grouped with search_path. This is useful to track how the situation changes between HEAD and any patches proposed. Christoph has proposed the test with ON COMMIT DROP temporary tables, and I have written the second part. Author: Christoph Berg <myon@debian.org> Author: Michael Paquier <michael@paquier.xyz> Discussion: https://postgr.es/m/Z9iWXKGwkm8RAC93@msg.df7cb.de