Scala SparkSession不存在

我试图使用Scala 2.11.12在Spark 2.3.0中定义一个udf。在我看来，我需要通过阅读

但是我不能导入这个对象

import org.apache.spark.sql.SparkSession

导致：

Error:(2, 8) object SparkSession is not a member of package org.apache.spark.sql
import org.apache.spark.sql.SparkSession

这是我的build.sbt：

name := "webtrends-processing-scala"

version := "0.1"

scalaVersion := "2.11.12"

libraryDependencies += "org.apache.spark" %% "spark-core" % "2.3.3"

libraryDependencies += "io.lemonlabs" %% "scala-uri" % "1.4.3"

---

您必须包括spark sql相关性：

libraryDependencies ++= Seq("org.apache.spark" %% "spark-core" % "2.3.0",
                            "org.apache.spark" %% "spark-sql"  % "2.3.0")