Re: unplanned sub-select error?

Tom Lane wrote:

>Kyle Bateman <kyle@actarg.com> writes:
>
>
>>I have a query:
>>insert into mtr_reg_v_wt (ropnum, inum, pnum, rquant, value, status,
>>ddate, fr_proj, to_proj) values (28985,1,1014,1,(select cost from
>>prd_part where pnum = 1014),'work','2005-Nov-15',50,75);
>>
>>
>
>
>
>>That used to work fine under 7.1.3 but now gives the error:
>>
>>
>
>
>
>>ERROR:  cannot handle unplanned sub-select
>>
>>
>
>You need to offer a little more context, like what PG version you are
>using now and what is the underlying DDL --- I suspect some rules or
>views are involved here, but you didn't show them to us.
>
>
>
Sorry, you're right.  I have now confirmed that this only happens when
updating via a view/rule (as you suspected).  Attached is a minimalist
sql file that demonstrates the same error message from a blank
database.  I'm using 8.1.0.  I'm pretty sure this problem did not exist
on 8.0.3.

Kyle

-- Expose the "unplanned sub-select" error message

create table parts (
    partnum    varchar(18) primary key,
    cost    float8
);

create table shipped (
    ttype    char(2),
    ordnum    int4,
    partnum    varchar(18) references parts,
    value    float8,

    primary key (ttype, ordnum)
);

create view shipped_view as
    select * from shipped where ttype = 'wt';

create rule shipped_view_insert as on insert to shipped_view
    do instead insert into shipped
        (ttype, ordnum, partnum, value)
    values
        ('wt', new.ordnum, new.partnum, new.value);

insert into parts (partnum, cost) values (1, 1234.56);

insert into shipped_view
    (ordnum, partnum, value)
    values
        (100,1,(select cost from parts where partnum = 1));