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This routine is a no-op since dd04e95 from 2003, with a macro kept around for compatibility purposes. This has led to the same code patterns being copy-pasted around for no effect, sometimes in confusing ways like in pg_logical_slot_get_changes_guts() from logical.c where the code was actually incorrect. This issue has been discussed on two different threads recently, so rather than living with this legacy, remove any uses of this routine in the C code to simplify things. The compatibility macro is kept to avoid breaking any out-of-core modules that depend on it. Reported-by: Tatsuhito Kasahara, Justin Pryzby Author: Tatsuhito Kasahara Discussion: https://postgr.es/m/20211217200419.GQ17618@telsasoft.com Discussion: https://postgr.es/m/CAP0=ZVJeeYfAeRfmzqAF2Lumdiv4S4FewyBnZd4DPTrsSQKJKw@mail.gmail.com