Scala案例类忽略了Spark shell中的导入 [英] Scala case class ignoring import in the Spark shell

问题描述

我希望这个问题有明显的答案！

I hope there is an obvious answer to this question!

我刚刚升级到Spark v2.0，并且 spark-shell (Scala 2.11内部版本)有一个奇怪的问题.

I've just upgraded to Spark v2.0 and have an odd problem with the spark-shell (Scala 2.11 build).

如果我输入以下最小Scala，

If I enter the following minimal Scala,

import java.sql.Timestamp

case class Crime(caseNumber: String, date: Timestamp, description: String, detail: String, arrest: Boolean)

我收到以下错误消息，

<console>:11: error: not found: type Timestamp

如果我在其他地方使用Java Timestamp 类，例如函数中，则不会生成任何错误(正如您期望的那样，因为导入).

If I use the Java Timestamp class elsewhere, e.g. in a function, then no errors are generated (as you would expect because of the import).

如果我完全符合条件并在案例类中使用 java.sql.Timestamp ，那么它将起作用！

If I fully qualify and use java.sql.Timestamp in the case class it works!

我缺少明显的东西吗?

推荐答案

只是在案例类声明中未加载时间戳，要解决此问题，您可以:

It's just that the Timestamp is not loaded in the case class declaration, to fix this you can:

:paste
import java.sql.Timestamp
case class Crime(caseNumber: String, date: Timestamp, description: String, detail: String, arrest: Boolean)

或

case class Crime(caseNumber: String, date: java.sql.Timestamp, description: String, detail: String, arrest: Boolean)

这篇关于Scala案例类忽略了Spark shell中的导入的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！