On Thu, Aug 4, 2016 at 01:05:53PM -0400, Bruce Momjian wrote:
> > Approach 2 seems more reasonable and simple.
> >
> > There are only 2 bits for lp_flags and all combinations are already used. But
> > for LP_REDIRECT root line pointer, we could use the lp_len field to store this
> > special flag, which is not used for LP_REDIRECT line pointers. So we are able
> > to mark the root line pointer.
>
> Uh, as I understand it, we only use LP_REDIRECT when we have _removed_
> the tuple that the ctid was pointing to, but it seems you would need to
> set HEAP_RECHECK_REQUIRED earlier than that.
>
> Also, what is currently in the lp_len field for LP_REDIRECT? Zeros, or
> random data? I am asking for pg_upgrade purposes.
It seems LP_REDIRECT's lp_len is always zero: :-)
/* * ItemIdSetRedirect * Set the item identifier to be REDIRECT, with the specified link. * Beware of
multipleevaluations of itemId! */#define ItemIdSetRedirect(itemId, link) \( \ (itemId)->lp_flags = LP_REDIRECT, \
(itemId)->lp_off= (link), \ (itemId)->lp_len = 0 \ ^^^^^^^^^^)
-- Bruce Momjian <bruce@momjian.us> http://momjian.us EnterpriseDB
http://enterprisedb.com
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