hi. we have 450 appearance of `cache lookup failed .*`
we have 141 appearance of `could not open file .*` so when it actually happens, it cannot quickly locate which function where the error has happened. maybe under certain conditions (e.g. certain build type or certain log_min_messages), we can also print out the function name by using gcc __func__. or we can just do like: if (!HeapTupleIsValid(tuple)) elog(ERROR, "cache lookup failed for relation %u %s", RelationGetRelid(rel), __func__); given that these errors are very unlikely to happen, if it happens, printing out the function name seems not that inversive?
