The following bug has been logged online:

Bug reference: 1853
Logged by: Dustin Sallings
Email address: dustin (AT) spy (DOT) net
PostgreSQL version: 8.1b1
Operating system: Mac OS X 10.3.something
Description: explain gives ERROR: bogus varno: 23
Details:

If I run this query on my model:

select
sensor_id,
min(sample) as min_reading,
avg(sample) as avg_reading,
stddev(sample) as stddev_reading,
max(sample) as max_reading,
date(ts) as day
from
samples
where
ts >= (select max(day)+1 from rollups_day)
and ts < current_date
group by
sensor_id, day


It works by itself, but if I run it in explain, it fails with the following
error:

ERROR: bogus varno: 23


.... I've so far been unable to make a standalone sample break because I
don't quite understand the problem.

samples is a view made of up union alls to a bunch of tables like this:

View definition:
((((( SELECT samples_1999.ts, samples_1999.sensor_id, samples_1999.sample
FROM samples_1999
UNION ALL
SELECT samples_2000.ts, samples_2000.sensor_id, samples_2000.sample
FROM samples_2000)
UNION ALL
SELECT samples_2001.ts, samples_2001.sensor_id, samples_2001.sample
FROM samples_2001)
UNION ALL
SELECT samples_2002.ts, samples_2002.sensor_id, samples_2002.sample
FROM samples_2002)
UNION ALL
SELECT samples_2003.ts, samples_2003.sensor_id, samples_2003.sample
FROM samples_2003)
UNION ALL
SELECT samples_2004.ts, samples_2004.sensor_id, samples_2004.sample
FROM samples_2004)
UNION ALL
SELECT samples_2005.ts, samples_2005.sensor_id, samples_2005.sample
FROM samples_2005;


I don't have any confidential data in this database, so I can provide the
entire thing if necessary, but it is a rather large database.

---------------------------(end of broadcast)---------------------------
TIP 4: Have you searched our list archives?

http://archives.postgresql.org

On Sun, Aug 28, 2005 at 06:13:12AM +0100, Dustin Sallings wrote:
This might be the same problem that was fixed yesterday:

http://archives.postgresql.org/pgsql...8/msg00374.php

Try building the latest code from CVS and see if you still get the
error.

Do you get the error if you execute "SET enable_bitmapscan TO off;"
and then run EXPLAIN?

--
Michael Fuhr

---------------------------(end of broadcast)---------------------------
TIP 1: if posting/reading through Usenet, please send an appropriate
subscribe-nomail command to majordomo (AT) postgresql (DOT) org so that your
message can get through to the mailing list cleanly