DSE/Cassandra CQL now（）不适用于时间戳记类型

Question

我在使用now()函数时遇到问题timestamp类型。

请看看下面的代码：

创建表：

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); 

有问题的INSERT查询：

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

插入查询似乎看没什么问题。然而，当我执行它，我看到以下错误：

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

我在做什么错在这里？

我使用DataStax企业4.5.2

Answer 1

现在（）返回一个timeuuid，而不是一个时间戳。你可以尝试dateOf（now（））。请从文档中阅读以下内容：

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.