| From: | Peter Geoghegan <pg(at)bowt(dot)ie> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org>, Anastasia Lubennikova <a(dot)lubennikova(at)postgrespro(dot)ru> |
| Subject: | Re: Allow to specify #columns in heap/index_form_tuple |
| Date: | 2017-03-31 19:19:38 |
| Message-ID: | CAH2-Wz=VMDH8pFAZX9WAH9Bn5Ast5vrnA0xSz+GsfRs12bp_sg@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Mar 31, 2017 at 3:03 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> The reason it works fine for heap tuples is that heap tuple headers
> explicitly record the number of attributes in the tuple. Index
> tuples don't.
Per my previous mail, I think we can change things so that Index
tuples effectively record that in all relevant cases. i.e., in what I
called separator key index tuples -- high key tuples in leaf pages,
and all internal page index tuples (high keys and downlinks/internal
items).
We already store a minus infinity downlink on internal pages, which
doesn't bother diagnostic tools at all, despite being its own special
case without real Datum values.
--
Peter Geoghegan
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