Specifically I think you need to study this patch:
http://archives.postgresql.org/pgsql-committers/2007-01/msg00370.php
But isn't back-porting plpgpsm to old releases a waste of development
and maintenance effort anyway?
I unlike it and last weak I play with it. But I don't expect so Debian and
RH will be support 8.3 soon. And I would to help to expansion plpgpsm. When
I comment FreeExecutorState, runtime works well (with some minor problems -
domains). With 8.1 support I will have much bigger group of users, testers
(I hope).
I have to study your patch.
Thank you
Pavel Stehule
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
