Fix python driver for the unified vertex implementation (#2282)

Fixed the python driver for the new unified vertex implementation.
It was inserting directly into the tables using the old implementation.

modified:   drivers/python/age/networkx/lib.py

Author: jrgemignani

drivers/python/age/networkx/lib.py

@@ -170,7 +170,7 @@ def getEdgeLabelListAfterPreprocessing(G: nx.DiGraph):
 
 
 def addAllNodesIntoAGE(connection: psycopg.connect, graphName: str, G: nx.DiGraph, node_label_list: Set):
-    """Add all node to AGE"""
+    """Add all node to AGE using the unified vertex table"""
     try:
         queue_data = {label: [] for label in node_label_list}
         id_data = {}
@@ -179,9 +179,11 @@ def addAllNodesIntoAGE(connection: psycopg.connect, graphName: str, G: nx.DiGrap
             json_string = json.dumps(data['properties'])
             queue_data[data['label']].append((json_string,))
 
+        unified_table = f"{graphName}._ag_label_vertex"
         for label, rows in queue_data.items():
-            table_name = """%s."%s" """ % (graphName, label)
-            insert_query = f"INSERT INTO {table_name} (properties) VALUES (%s) RETURNING id"
+            # Get the label table OID for the labels column
+            label_table = f'{graphName}."{label}"'
+            insert_query = f"INSERT INTO {unified_table} (properties, labels) VALUES (%s, '{label_table}'::regclass::oid) RETURNING id"
             cursor = connection.cursor()
             cursor.executemany(insert_query, rows, returning=True)
             ids = []
@@ -224,19 +226,21 @@ def addAllEdgesIntoAGE(connection: psycopg.connect, graphName: str, G: nx.DiGrap
 
 
 def addAllNodesIntoNetworkx(connection: psycopg.connect, graphName: str, G: nx.DiGraph):
-    """Add all nodes to Networkx"""
-    node_label_list = get_vlabel(connection, graphName)
+    """Add all nodes to Networkx from the unified vertex table"""
     try:
-        for label in node_label_list:
-            with connection.cursor() as cursor:
-                cursor.execute("""
-                SELECT id, CAST(properties AS VARCHAR) 
-                FROM %s."%s";
-                """ % (graphName, label))
-                rows = cursor.fetchall()
-                for row in rows:
-                    G.add_node(int(row[0]), label=label,
-                               properties=json.loads(row[1]))
+        with connection.cursor() as cursor:
+            # Read all vertices from unified table, getting label from labels column
+            cursor.execute("""
+                SELECT id, CAST(properties AS VARCHAR),
+                       ag_catalog._label_name_from_table_oid(labels) as label
+                FROM %s._ag_label_vertex;
+            """ % graphName)
+            rows = cursor.fetchall()
+            for row in rows:
+                # Empty string label means default/unlabeled vertex
+                label = row[2] if row[2] else '_ag_label_vertex'
+                G.add_node(int(row[0]), label=label,
+                           properties=json.loads(row[1]))
     except Exception as e:
         print(e)