#fsdb cid sid cname
10	1	overflow-once-0
10	1	overflow-once-1
11	2	overflow-twice-0
11	2	overflow-twice-1
11	2	overflow-twice-2
12	1	non-overflow
12	2	non-overflow
#  | dbsort -n cid
#   | dbjoin -m righthash --input TEST/dbjoin_ex.in --input TEST/dbjoin_ex_overflow.in-2 -n cid
