结构化流式传输：无法从时间戳3中提取值：需要结构类型但有时间戳；

Question

运行StructuredNetworkWordCountWindowed示例时出现错误。

Error: org.apache.spark.sql.AnalysisException: Can't extract value from timestamp#3: 
need struct type but got timestamp;

我已经用Google搜索，但是没有解决方案。这真是令人困惑。这是代码：

val words = lines.as[(String, Timestamp)].flatMap(line =>
      line._1.split(" ").map(word => (word, line._2))
    ).toDF("word", "timestamp")

val windowedCounts = words.groupBy(
  window($"timestamp", windowDuration, slideDuration)
).count().orderBy("window")

val query = windowedCounts.writeStream
  .outputMode("complete")
  .format("console")
  .option("truncate", "false")
  .start()