The following bug has been logged online:

Bug reference: 2837
Logged by: canli
Email address: canli (AT) wp (DOT) pl
PostgreSQL version: 8.2.0
Operating system: Linux ES 4
Description: i received ERROR: failed to build any 7-way joins
Details:

When I execute a query:

SELECT n1.numer AS wydany_nr, n2.numer AS zwrocony_nr FROM operacje o LEFT
JOIN (wydane_numery wt1 JOIN boki_
numery bn1 USING(id_nr_w_bok) JOIN numery n1 USING(id_numeru ))
ON(wt1.id_operacji = o.id_operacji AND wt1.wydanie_zwrot = 'W') LEFT JOIN
(wydane_numery wt2
JOIN boki_numery bn2 USING(id_nr_w_bok) JOIN numery n2 USING(id_numeru ))
ON(wt2.id_operacji = o.id_operacji AND wt2.wydanie_zwrot = 'Z') WHERE
o.id_operacji
= 349736

i received an error: failed to build any 7-way joins

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