Re: Block-level CRC checks

* Simon Riggs:

> * Put all hint bits in the block header to allow them to be excluded
> more easily from CRC checking. If we used 3 more bits from
> ItemIdData.lp_len (limiting tuple length to 4096) then we could store
> some hints in the item pointer. HEAP_XMIN_INVALID can be stored as
> LP_DEAD, since that will happen very quickly anyway.

What about putting the whole visibility information out-of-line, into
its own B-tree, indexed by page number?

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Florian Weimer                <fweimer@bfk.de>
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