Could we see a complete test case for this?  No one can guess at the
tables, indexes, etc that might be needed to provoke the problem.

Complete testcase is below.
Should I try 9.0 release or other idea how to fix without removing primary key and keeping query structure so that query runs in all >=8.1 servers ?

Andrus.

create temp table klient (kood char(12) primary key, hinnak char(5)) on commit drop;

SELECT *
   FROM (select 1) xtoode
   LEFT JOIN (SELECT hmguid.toode,
  COALESCE(hinnamtr.hinnak,klient.hinnak ) AS hinnak
FROM (
SELECT
 hmhinnak.toode,
 ''::char as guid
FROM (

select ''::char as toode,
  1 as prioriteet
) prioriteet

JOIN (

SELECT
''::char as toode,
 ''::text as guid,
  1 as prioriteet
) hmhinnak

USING (toode,prioriteet)

) hmguid

JOIN (select ''::char as guid, ''::char as hinnak) hinnamtr USING (guid)
LEFT JOIN  klient ON klient.kood=''
) temphinnaks on true


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