Graph Pattern Function

In addition to the various relational data-based function operations introduced earlier, NeuG also specifically supports a set of functions for operating on node, edge, and path data generated by graph patterns.

Node Function

Function	Description	Example
ID()	Get the Internal ID of a node/edge	Return (a) Return ID(a)
LABEL()	Get the label of a node/edge	Match (a) Return LABEL(a)

Edge Function

In addition to ID and LABEL functions, there are the following edge-based function operations:

Function	Description	Example
START_NODE()	Returns the starting node of edge data	Match ()-[b]->() Return START_NODE(b);
END_NODE()	Returns the ending node of edge data	Match ()-[b]->() Return END_NODE(b);

Repeated Path Function

Function	Description	Example
NODES	Returns all nodes from a path	Match (a)-[b*2..3]->() Return NODES(b);
RELS	Returns all edges from a path	Match (a)-[b*2..3]->() Return RELS(b);
PROPERTIES	Returns given property from nodes/edges	Match (a)-[b*2..3]->() Return PROPERTIES(nodes(b), ‘name’), PROPERTIES(rels(b), ‘weight’);
IS_TRAIL	Checks if path contains repeated edges (`true` if no)	Match (a)-[b*2..3]->() Return IS_TRAIL(b);
IS_ACYCLIC	Checks if path contains repeated nodes (`true` if no)	Match (a)-[b*2..3]->() Return IS_ACYCLIC(b);
LENGTH	Returns the length of a path	Match (a)-[b*2..3]->() Return LENGTH(b);