heres the structure of: select(from_obj=[t1, t2, t1.join(t2)])
select +---> t1 <-------------+
|---> t2 <------------|
+---> join of t1/t2 ---+
t2 and t1 both have two parents, and there are two paths to each of t1
and t2 from the head select. so its not a tree in the strict sense.
or another one:
s1 = t1.select().alias('s1')
s2 = t1.select().alias('s2')
s3 = s1.union(s2) (two paths to t1: s3->s1->t1, s3->s2->t1)
any kind of subquery which references a table at a higher level falls
into this category.
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