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