我在Spark中有以下代码:
rdd
.map(processFunction(_))
.saveToCassandra("keyspace", "tableName")
何处
def processFunction(src: String): Seq[Any] =
src match {
case "a" => List(A("a", 123112, "b"), A("b", 142342, "c"))
case "b" => List(B("d", 12312, "e", "f"), B("g", 12312, "h", "i"))
}
在哪里:
case class A(entity: String, time: Long, value: String)
case class B(entity: String, time: Long, value1: String, value2: String)
saveToCassandra
期望一个对象集合,并使用 Seq[Any]
作为返回类型来同时包含 Seq[A]
和 Seq[B]
,这会导致 saveToCassandra
报错,错误信息为 - scala.ScalaReflectionException: <none>
is not a term。可能的原因是什么?