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Clarify some comments in vacuumlazy.c
Author: Justin Pryzby Discussion: https://postgr.es/m/20200113004542.GA26045@telsasoft.com
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@ -1507,8 +1507,8 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats,
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/*
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* It should never be the case that the visibility map page is set
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* while the page-level bit is clear, but the reverse is allowed
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* (if checksums are not enabled). Regardless, set the both bits
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* so that we get back in sync.
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* (if checksums are not enabled). Regardless, set both bits so
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* that we get back in sync.
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*
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* NB: If the heap page is all-visible but the VM bit is not set,
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* we don't need to dirty the heap page. However, if checksums
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@ -1563,9 +1563,9 @@ lazy_scan_heap(Relation onerel, VacuumParams *params, LVRelStats *vacrelstats,
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}
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/*
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* If the all-visible page is turned out to be all-frozen but not
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* marked, we should so mark it. Note that all_frozen is only valid
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* if all_visible is true, so we must check both.
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* If the all-visible page is all-frozen but not marked as such yet,
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* mark it as all-frozen. Note that all_frozen is only valid if
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* all_visible is true, so we must check both.
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*/
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else if (all_visible_according_to_vm && all_visible && all_frozen &&
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!VM_ALL_FROZEN(onerel, blkno, &vmbuffer))
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