| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
| Cc: | Manfred Koizar <mkoi-pg(at)aon(dot)at>, Sean Chittenden <sean(at)chittenden(dot)org>, "Marc G(dot) Fournier" <scrappy(at)postgresql(dot)org>, Vivek Khera <khera(at)kcilink(dot)com>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: State of Beta 2 |
| Date: | 2003-09-12 15:23:35 |
| Message-ID: | 11537.1063380215@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> writes:
> Manfred Koizar wrote:
>> This 1600 column limit has nothing to do with block size. It is
>> caused by the fact that a heap tuple header cannot be larger than 255
>> bytes, so there is a limited number of bits in the null bitmap.
> Are you sure. Then our max would be:
> 255 * 8 = 2040
I assure you, Manfred knows heap tuple headers inside and out ;-)
See the comments at the top of src/include/access/htup.h.
regards, tom lane
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