Re: [BUGS] BUG #14350: VIEW with INSTEAD OF INSERT TRIGGER and COPY. Missing feature or working as designed. - Mailing list pgsql-hackers

On Tue, Nov 1, 2016 at 12:40 PM, Haribabu Kommi
<kommi.haribabu@gmail.com> wrote:
> COPY command is treated as an UTILITY command, During the query
> processing, the rules are not applied on the COPY command, and in the
> execution of COPY command, it just inserts the data into the heap and
> indexes with direct calls.
>
> I feel supporting the COPY command for the case-2 is little bit complex
> and may not be that much worth.

I agree it will be complex..
>
> Attached is the updated patch with doc changes.

Now since we are adding support for INSTEAD OF TRIGGER in COPY FROM
command, It will be good that we provide a HINT to user if INSTEAD of
trigger does not exist, like we do in case of insert ?

INSERT case:
postgres=# insert into ttt_v values(7);
2016-11-01 14:31:39.845 IST [72343] ERROR:  cannot insert into view "ttt_v"
2016-11-01 14:31:39.845 IST [72343] DETAIL:  Views that do not select
from a single table or view are not automatically updatable.
2016-11-01 14:31:39.845 IST [72343] HINT:  To enable inserting into
the view, provide an INSTEAD OF INSERT trigger or an unconditional ON
INSERT DO INSTEAD rule.

COPY case:
postgres=# COPY ttt_v FROM stdin;
2016-11-01 14:31:52.235 IST [72343] ERROR:  cannot copy to view "ttt_v"
2016-11-01 14:31:52.235 IST [72343] STATEMENT:  COPY ttt_v FROM stdin;