There are two types of key values stored in the index: routing and row keys. Routing keys are stored in Vtrie
nodes, while row keys are stored at the leaf level, which consists of an ordered list of leaf nodes. Every leaf node
is pointed to by one routing key stored in the Vtrie. The value of the routing key is higher than the high key of
the node’s left sibling and at most the same as the low key of the leaf node it points to.