Stripe general sde OA

Sparse Matrix with missing valueseach row is presented as list of pairs of {col1:value1} {col2:value2} …
implement a function that can get minvalueof a column across entire dataset.
Notice this is a sparse matrix so some colmns might not show up in certain rows. If that is the case, we by default give that colmn
value 0 for those rows.