Using PostgreSQL 8.2.3, on linux (FC3):
test=> select lseg'((0,0),(1,0))' ?# lseg'((0,0),(1,0))';
-[ RECORD 1 ]
?column? | f
while
avail=> select lseg'((0,0),(1,0))' ?# lseg'((0,0),(1,1))';
-[ RECORD 1 ]
?column? | t
Looking over the geometric operations source it appears that the
intersect operation applied to line segments will only work if they
intersect at a single point.
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