Function follow_list_like_index 

fn follow_list_like_index<L: ListLikeArray + 'static>(
    typed_value: &dyn Array,
    index: usize,
) -> Result<ShreddedPathStep>

Take one list-like element (at index) per input row as the next path step.

Arrays are never stored in value when typed_value is a list, so when no element can match, the step is ShreddedPathStep::Missing without consulting value.