Add InDegree and OutDegree in O(1) (#1217)

include/mgp.hpp

@@ -752,6 +752,12 @@ class Node {
   /// @brief returns the string representation
   const std::string ToString() const;
 
+  /// @brief returns the in degree of a node
+  inline size_t InDegree() const;
+
+  /// @brief returns the out degree of a node
+  inline size_t OutDegree() const;
+
  private:
   mgp_vertex *ptr_;
 };
@@ -2790,6 +2796,10 @@ inline const std::string Node::ToString() const {
   return "(id: " + std::to_string(Id().AsInt()) + labels + ", properties: {" + properties + "})";
 }
 
+inline size_t Node::InDegree() const { return mgp::vertex_get_in_degree(ptr_); }
+
+inline size_t Node::OutDegree() const { return mgp::vertex_get_out_degree(ptr_); }
+
 // Relationship:
 
 inline Relationship::Relationship(mgp_edge *ptr) : ptr_(mgp::MemHandlerCallback(edge_copy, ptr)) {}