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This allows table AMs that don't need these horizons. This was already documented in the tableam relation_set_new_filenode callback, but an assert prevented if from actually working (the test AM code contained the change itself). Defang the asserts in the general code, and move the stronger ones into heap AM. Relatedly, after CLUSTER/VACUUM, we'd always assign a relfrozenxid / relminmxid. Change the table_relation_copy_for_cluster() interface to allow the AM to overwrite the horizons that get set on the pg_class entry. This'd also in the future allow AMs like heap to compute a relfrozenxid during rewrite that's the table's actual minimum rather than a pre-determined value. Arguably it'd have been better to move the whole computation / setting of those values into the callback, but it seems likely that for other reasons it'd be better to be able to use one value to vacuum/cluster multiple tables (e.g. a toast's horizon shouldn't be different than the table's). Reported-By: Heikki Linnakangas Author: Andres Freund Discussion: https://postgr.es/m/9a7fb9cc-2419-5db7-8840-ddc10c93f122@iki.fi
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