id, vectors
1, [1,2,3]
2, [2,3,4]
3, [3,4,5]

+---+-----+------+
|id |index|vector|
+---+-----+------+
|1  |0    |1     |
|1  |1    |2     |
|1  |2    |3     |
|2  |0    |2     |
|2  |1    |3     |
|2  |2    |4     |
|3  |0    |3     |
|3  |1    |4     |
|3  |2    |5     |
+---+-----+------+