Array of Array of Elements doesn't have an element schema

Array of Array of Elements doesn't have an element schema
DiRowStructVisitor doesn't support element schema in the object like List of List of values.

If I have in a studio row the column with object (List<List<Integer>>) the elementSchema of the deepest element will be null

Is it expected and desired behavior, or it was it just not implemented because it's a rare case.

https://github.com/Talend/component-runtime/blob/ce2f787653fa1520807c2932ec4219c11[]…/talend/sdk/component/runtime/di/record/DiRowStructVisitor.java