Re: top-level DML under CTEs

On 2010-09-17 4:48 AM, Hitoshi Harada wrote:
> 2010/9/15 Hitoshi Harada<umi(dot)tanuki(at)gmail(dot)com>:
>> Well, I didn't know it is allowed. That would look like the way to go.
>
> I made changes to the previous version, so that it avoids to resolve
> CTE name duplication.

This patch still doesn't address the issue Tom raised here:
http://archives.postgresql.org/pgsql-hackers/2010-09/msg00753.php

For WITH .. INSERT .. WITH .. SELECT ..; this patch works OK, but not so
much for VALUES:

=# CREATE RULE barrule AS ON UPDATE TO bar DO INSTEAD
-# WITH RECURSIVE t AS (SELECT -1)
-# INSERT INTO bar
-# WITH t AS (SELECT 1)
-# VALUES((SELECT * FROM t));
CREATE RULE

=# \d bar
Table "public.bar"
Column | Type | Modifiers
--------+---------+-----------
a | integer |
Rules:
barrule AS
ON UPDATE TO bar DO INSTEAD WITH RECURSIVE t AS (
SELECT 1
), t AS (
SELECT (-1)
)
INSERT INTO bar (a) WITH RECURSIVE t AS (
SELECT 1
), t AS (
SELECT (-1)
)

VALUES (( SELECT t."?column?"
FROM t))

Regards,
Marko Tiikkaja