Peter Geoghegan <p...@bowt.ie> writes: > I think that this doesn't really belong here; new_rel_tuples should > only be used for VACUUM VERBOSE/server log output, once we return to > heap_vacuum_rel from lazy_scan_heap. We should use > vacrel->new_live_tuples as our IndexVacuumInfo.num_heap_tuples value > in the amvacuumcleanup path (instead of new_rel_tuples). That way the > rule about IndexVacuumInfo.num_heap_tuples is simple: it's always > taken from pg_class.reltuples (for the heap rel). Either the existing > value, or the new value.
The places where index AMs refer to num_heap_tuples seem to be using it as a ceiling on estimated index tuple counts. Given that we should be counting dead index entries, redefining it as you suggest would be wrong. regards, tom lane