REL_QUERY

REL_QUERY = '\nMATCH (
  n)-[e]->(m)\nWITH DISTINCT\n    labels(n) AS start_node_labels,\n    type(e) AS rel_type,\n    labels(m) AS end_node_labels,\n    e,\n    keys(e) AS properties\nUNWIND CASE WHEN size(properties) > 0 THEN properties ELSE [null] END AS prop\nWITH\n    start_node_labels,\n    rel_type,\n    end_node_labels,\n    CASE WHEN prop IS NULL THEN [] ELSE [prop, valueType(e[prop])] END AS property_info\nRETURN\n    start_node_labels,\n    rel_type,\n    end_node_labels,\n    COLLECT(DISTINCT CASE \n    WHEN property_info <> [] \n    THEN property_info \n    ELSE null END
) AS properties_info\n'