[BUG?] equation in ON-clause must be in specific order?

Hi,

writing
   SELECT * FROM t1
   LEFT JOIN t2 ON (t2.c1=t1.c1)
   LEFT JOIN t3 ON (t3.c2=t2.c2)
is _not_ equal to
   SELECT * FROM table1
   LEFT JOIN t2 ON (t1.c1=t2.c1)
   LEFT JOIN t3 ON (t2.c2=t3.c2)

Well, i'd expect the results to be equal, but the first results in about 
1200 rows, and the second in about 1300 rows which is more.
As far as i can tell, it only affected the second LEFT JOIN in my case, 
but perhaps this is a problem in general.

Perhaps the expressions like t2.c2=t3.c2 should be "sorted" to be 
t3.c2=t2.c2 which might also get better cache performance.
(i noticed that if i swap t3 and t2 in the ON-clause SAPDB performs the 
query much slower the first time run it although it should practically 
be the same query that i executed before)