時間類型的問題，例如 wShortest 聚合的持續時間 function

Question

我有 Memgraph v2.0，似乎像持續時間這樣的時間類型不能成為 wShortest 聚合 function 的一部分。這是我的代碼：

MATCH (n) DETACH DELETE n;
CREATE
    (storage {name: "storage", current_time: localtime("T11:00")}),
    (tape {name: "tape"}),
    (lto {name: "lto"}),
    (archive1 {name: "archive1", opens: localtime("T10:00"), closes: localtime("T11:00")}),
    (archive2 {name: "archive2", opens: localtime("T08:00"), closes: localtime("T10:00")}),
    (archive3 {name: "archive3", opens: localtime("T13:00"), closes: localtime("T16:00")}),
    (archive4 {name: "archive4", opens: localtime("T15:00"), closes: localtime("T19:00")}),
    (storage)-[:Fetch {duration: duration("3H")}]->(tape),
    (storage)-[:Fetch {duration: duration("1H")}]->(lto),
    (tape)-[:Drive {duration: duration("2H")}]->(archive1),
    (tape)-[:Drive {duration: duration("4H")}]->(archive2),
    (lto)-[:Ride {duration: duration("5H")}]->(archive3),
    (lto)-[:Ride {duration: duration("4H")}]->(archive)
;

這是wShortest查詢：

MATCH (a {name: "storage"})-[edge_list *wShortest 10 (e, n | e.duration) fetch_time]->(b)
RETURN *;

我得到的錯誤是Error: Query failed: Calculated weight must be numeric, got duration.

Answer 1

這是 Memgraph 2.1.0 版本修復的錯誤。 在變更日志中它說：允許持續時間值用作加權最短路徑查詢中的權重。