Re: Rules: A Modest Proposal

Martijn van Oosterhout <kleptog@svana.org> writes:
> ISTM it may be possible to use the new WITH construct here. So the rule
> evaluation for the following

>> create table t (a integer);
>> create table t_log (a integer);
>> create rule t_ins AS ON insert TO t do also insert into t_log values (NEW.a);
>> insert into t values (floor(random()*1000)::integer);

> becomes something like:

> WITH NEW AS (
>   insert into t values (floor(random()*1000)::integer);
>   RETURNING *
> ) 
> insert into t_log values (NEW.a);

> Would this not have the required semantics?

Interesting idea, but it's not clear how to make it work with multiple
DO ALSO rules, nor with conditional DO INSTEAD rules.
        regards, tom lane