| From: | "Hiroshi Inoue" <Inoue(at)tpf(dot)co(dot)jp> |
|---|---|
| To: | "Chris Bitmead" <chrisb(at)nimrod(dot)itg(dot)telstra(dot)com(dot)au> |
| Cc: | <pgsql-hackers(at)postgreSQL(dot)org>, "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Subject: | RE: PGSQL internals question... |
| Date: | 2000-06-23 08:35:53 |
| Message-ID: | 000a01bfdcee$0ad32480$2801007e@tpf.co.jp |
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| Lists: | pgsql-hackers |
> -----Original Message-----
> From: pgsql-hackers-owner(at)hub(dot)org [mailto:pgsql-hackers-owner(at)hub(dot)org]On
> Behalf Of Chris Bitmead
>
> Would a non-existant attribute have a system attribute number? Where do
> you suggest this code should be that "pulls it out"?
>
CTID has a system attribute number SelfItemPointerAttributeNumber(-1).
Different from other system attributes it corresponds to an item(t_self)
in HeapTupleData not to an item(t_ctid) in HeapTupleHeaderData.
Please look at include/access/htup.h.
Probably heap_xxxx() functions in access/heap/heapam.c would have
to fill in the new system attribute.
Regards.
Hiroshi Inoue
Inoue(at)tpf(dot)co(dot)jp
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