Andrew Gierth <and...@tao11.riddles.org.uk> writes:
> select * from test1 full join test2 using (a,b) where b=1;

> 8.3.1 and CVS HEAD produce a plan in which the b=1 condition is pushed
> down into each side of the join, but 8.3.6 and 8.3.7 do not.

It does what you're expecting in 8.3 branch tip.

http://archives.postgresql.org/pgsql-committers/2009-04/msg00204.php

We're really overdue for a set of back-branch update releases :-(

                        regards, tom lane

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