| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> |
| Cc: | "Gregory Stark" <stark(at)enterprisedb(dot)com>, "Bruce Momjian" <bruce(at)momjian(dot)us>, "Heikki Linnakangas" <heikki(at)enterprisedb(dot)com>, "Florian Pflug" <fgp(dot)phlo(dot)org(at)gmail(dot)com>, "Simon Riggs" <simon(at)2ndquadrant(dot)com>, PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: HOT patch - version 15 |
| Date: | 2007-09-11 14:36:57 |
| Message-ID: | 28216.1189521417@sss.pgh.pa.us |
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| Lists: | pgsql-patches |
"Pavan Deolasee" <pavan(dot)deolasee(at)gmail(dot)com> writes:
> I would actually think twice before even doing this because this would
> lead to complete change in heap page structure and stop people from
> upgrading to 8.3 without a complete dump/restore. I don't remember 8.3
> introduces any other significant change which already enforces that.
Then you don't remember far enough --- either the HeapTupleHeader change
or the varvarlena change would be enough to prevent that. For that
matter, the pd_flags header field that the patch is already relying on
is new for 8.3.
Adding an xmin field might or might not be a good solution, but to
complain about it on compatibility grounds is silly.
regards, tom lane
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