| From: | Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> |
|---|---|
| To: | Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM> |
| Cc: | PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: pg_upgrade: convert on read is dead end |
| Date: | 2008-10-13 15:29:56 |
| Message-ID: | 48F36974.3010007@enterprisedb.com |
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| Lists: | pgsql-hackers |
Zdenek Kotala wrote:
> I expect that function cannot get toast pointer. It can get only
> detoasted attributes. Correct me if I'm wrong.
A function is passed a raw datum, which can be toasted. Now, practically
all functions call one of the PG_GETARG_* macros that detoast the datum
before doing anything else, but there is also PG_GETARG_RAW_VARLENA_P
macro that returns the toast pointer. Although, grepping through the
source code suggests that it's not actually used anywhere.
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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