DISTINCT is not quite distinct

[Florian Weimer <fweimer@xxxxxx>]

I run this innocent query

CREATE TABLE foo AS SELECT DISTINCT bar FROM baz ORDER BY bar;

and the resulting table contains duplicate rows. 8-(

According to EXPLAIN, an index scan on the bar column is used (using
the underlying B-tree index).  This is with PostgreSQL 8.1.4 (Debian
package 8.1.4-6).  Is this a known problem?

If I drop the DISTINCT, the output is not correctly ordered, either.
Perhaps this is an index corruption issue?  The hardware itself seems
fine.

-- 
Florian Weimer                <fweimer@xxxxxx>
BFK edv-consulting GmbH       http://www.bfk.de/
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