#Rowid columnid value
#What to return: Column id: list of row id and value
0   1	1
0   2	2
1   3	3
2   0	4
2   3	5
3   4	6
4   2	7
4   5	8
5   6	9
5   7	10
7   2	11
7   5	12
7   8	13