RE: [HACKERS] SELECT FOR UPDATE in (PL/pgSQL) function

>
> Is't possible to use SELECT FOR UPDATE in functions ?
> I have function for 'insert or update' which works ok, but as I have some
> problem with duplicated records I tried as suggested by Tom Lane to use
> SELECT FOR UPDATE instead of just select. Unfortunately it doesn't works:
>
> ERROR:  query didn't return correct # of attributes for *internal*
>

AFAIC,"SELECT FOR UPDATE" always causes above errors in
PL/pgSQL functions.
Could we use PL/pgSQL for update procedures in MVCC ?

ORDER/GROUP BY items that are not in the targetlist also cause
same errors in PL/pgSQL functions.
In both cases,target entries are added which are not wanted in the
final projected tuple(SELECT FOR UPDATE adds "ctid" entry).

In such cases,the # of target entries is different from the # of
final attributes estimated in pl_gram.y and above elog() in
pl_exec.c is called.

Should current check be loosen ?
Or another check is necessary ?

Regards.

Hiroshi Inoue
Inoue@tpf.co.jp