From: torikoshia <torikoshia@oss.nttdata.com>
To: Pgsql Hackers <pgsql-hackers@postgresql.org>
Subject: EXPLAIN(VERBOSE) to CTE with SEARCH BREADTH FIRST fails
Date: Tue, 07 Sep 2021 12:41:02 +0900
Message-ID: <5bafa66ad529e11860339565c9e7c166@oss.nttdata.com> (raw)
Hi,
While working on [1], we found that EXPLAIN(VERBOSE) to CTE with SEARCH
BREADTH FIRST ends up ERROR.
This can be reproduced at the current HEAD(4c3478859b7359912d7):
=# create table graph0( f int, t int, label text);
CREATE TABLE
=# insert into graph0 values (1, 2, 'arc 1 -> 2'),(1, 3, 'arc 1 ->
3'),(2, 3, 'arc 2 -> 3'),(1, 4, 'arc 1 -> 4'),(4, 5, 'arc 4 -> 5');
INSERT 0 5
=# explain(verbose) with recursive search_graph(f, t, label) as (
select * from graph0 g
union all
select g.*
from graph0 g, search_graph sg
where g.f = sg.t
) search breadth first by f, t set seq
select * from search_graph order by seq;
ERROR: failed to find plan for CTE sg
Is this a bug?
[1]
https://www.postgresql.org/message-id/flat/cf8501bcd95ba4d727cbba886ba9eea8@oss.nttdata.com
Regards,
--
Atsushi Torikoshi
NTT DATA CORPORATION
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To: pgsql-hackers@postgresql.org
Cc: torikoshia@oss.nttdata.com
Subject: Re: EXPLAIN(VERBOSE) to CTE with SEARCH BREADTH FIRST fails
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