I wrote:
> Simon Riggs <[EMAIL PROTECTED]> writes:
>> In some cases, but my wish is also to minimise WAL volume as much as
>> possible.

> I'm with Greg on this one: baroque bit-squeezing schemes are a bad idea.

Wait a minute ... why are we even having this conversation?  XLogRecord
has at least two entirely-wasted bytes right now, due to alignment.
It is entirely not sane to consider messing with xl_prev in preference
to using that space.

                        regards, tom lane

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