DSE/Cassandra CQL now（）不適用於時間戳記類型

Question

我在使用now()函數時遇到問題timestamp類型。

請看看下面的代碼：

創建表：

CREATE TABLE "Test" (
    video_id UUID, 
    upload_timestamp TIMESTAMP, 
    title VARCHAR, 
    views INT, 
    PRIMARY KEY (video_id, upload_timestamp) 
) WITH CLUSTERING ORDER BY (upload_timestamp DESC); 

有問題的INSERT查詢：

INSERT INTO "Test" (video_id, upload_timestamp, title, views) 
    VALUES (uuid(), now(), 'Test', 0); 

插入查詢似乎看沒什麼問題。然而，當我執行它，我看到以下錯誤：

Unable to execute CQL script on 'XXX': cannot assign result of function now (type timeuuid) to upload_timestamp (type timestamp)

我在做什麼錯在這裏？

我使用DataStax企業4.5.2

Answer 1

現在（）返回一個timeuuid，而不是一個時間戳。你可以嘗試dateOf（now（））。請從文檔中閱讀以下內容：

dateOf and unixTimestampOf

The dateOf and unixTimestampOf functions take a timeuuid argument and extract the embedded timestamp. However, while the dateof function return it with the timestamp type (that most client, including cqlsh, interpret as a date), the unixTimestampOf function returns it as a bigint raw value.