Well, altho not a bug (actually i think its a fix), the change of the behaviour should be listed in JDBC changes in the pgsql4.1 README file.
(Its the first time i actually read every single line
of the README and i failed to locate the point that
was supposed to give me trouble).
--
-Achilleus
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
