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Re: [PATCHES] WITH RECUSIVE patches 0723

From: David Fetter <david(at)fetter(dot)org>
To: Tatsuo Ishii <ishii(at)postgresql(dot)org>
Cc: tgl(at)sss(dot)pgh(dot)pa(dot)us, pgsql-patches(at)postgresql(dot)org,pgsql-hackers(at)postgresql(dot)org, y-asaba(at)sraoss(dot)co(dot)jp
Subject: Re: [PATCHES] WITH RECUSIVE patches 0723
Date: 2008-07-25 00:15:13
Message-ID: 20080725001513.GF16438@fetter.org (view raw or flat)
Thread:
Lists: pgsql-hackerspgsql-patches
On Thu, Jul 24, 2008 at 01:55:37PM +0900, Tatsuo Ishii wrote:
> > Program received signal SIGSEGV, Segmentation fault.
> 
> Thanks for the report. Here is the new patches from Yoshiyuki.

Thanks for the patch :)

Now, I get a different problem, this time with the following code
intended to materialize paths on the fly and summarize down to a
certain depth in a tree:

CREATE TABLE tree(
    id INTEGER PRIMARY KEY,
    parent_id INTEGER REFERENCES tree(id)
);

INSERT INTO tree
VALUES (1, NULL), (2, 1), (3,1), (4,2), (5,2), (6,2), (7,3), (8,3),
       (9,4), (10,4), (11,7), (12,7), (13,7), (14, 9), (15,11), (16,11);

WITH RECURSIVE t(id, path) AS (
    VALUES(1,ARRAY[NULL::integer])
UNION ALL
    SELECT tree.id, t.path || tree.id
    FROM tree JOIN t ON (tree.parent_id = t.id)
)
SELECT
    t1.id, count(t2.*)
FROM
    t t1
JOIN
    t t2
ON (
    t1.path[1:2] = t2.path[1:2]
AND
    array_upper(t1.path,1) = 2
AND
    array_upper(t2.path,1) > 2
)
GROUP BY t1.id;
ERROR: unrecognized node type: 203

Please apply the attached patch to help out with tab
completion in psql.

Cheers,
David.
-- 
David Fetter <david(at)fetter(dot)org> http://fetter.org/
Phone: +1 415 235 3778  AIM: dfetter666  Yahoo!: dfetter
Skype: davidfetter      XMPP: david(dot)fetter(at)gmail(dot)com

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