Comment 6 for bug 967242

It even do not need random function:

SELECT t2_1.b as zzz
FROM t1 JOIN t2 AS t2_1 JOIN t2 AS t2_2
ON (t2_2.b = t2_1.b ) AND (t2_2.c = t2_1.c )
WHERE
t2_1.b + 1 > 0 OR
a = t2_1.c
GROUP BY zzz;
zzz
8
4
3
8
3
0
3