Add all heap page rows visible bitmap idea:
< the heap. One way to allow this is to set a bit to index tuples
> the heap. One way to allow this is to set a bit on index tuples
< be cleared when a heap tuple is expired.
> be cleared when a heap tuple is expired. Another idea is to maintain
> a bitmap of heap pages where all rows are visible to all backends,
> and allow index lookups to reference that bitmap to avoid heap
> lookups, perhaps the same bitmap we might add someday to determine
> which heap pages need vacuuming.
TODO (r1.1708 -> r1.1709)
TODO.html (r1.215 -> r1.216)
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