headsup courtesy of buildfarm.
problems apparently with NaNs, infinities and negative zeros.
see: http://www.pgbuildfarm.org/cgi-bin/show_log.pl?nm=fantail&dt=2004-12-06%2011:05:24
cheers
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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
