[FLINK-1378] could not find implicit value for evidence parameter of type TypeInformation

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.7.0-incubating
• Fix Version/s: 0.8.0, 0.9
• Component/s: API / Scala
• Assignee: Aljoscha Krettek
• Reporter: John Sandiford
• Created: 09/Jan/15 14:00
• Updated: 27/Jan/15 21:01
• Resolved: 27/Jan/15 21:01

Description

This is an example of one of many cases that I cannot get to compile with the scala API. I have tried using T : TypeInformation and : ClassTag but still cannot get it to work.

//libraryDependencies += "org.apache.flink" % "flink-scala" % "0.7.0-incubating"
//
//libraryDependencies += "org.apache.flink" % "flink-clients" % "0.7.0-incubating"

import org.apache.flink.api.scala._

import scala.util.

{Success, Try}

object Main extends App {

val env = ExecutionEnvironment.getExecutionEnvironment
val data: DataSet[Double] = env.fromElements(1.0, 2.0, 3.0, 4.0)

def f[T](data: DataSet[T]): DataSet[(T, Try[Seq[Double]])] = {

data.mapPartition((iterator: Iterator[T]) =>

{ val first = iterator.next() val second = iterator.next() Iterator((first, Success(Seq(2.0, 3.0))), (second, Success(Seq(3.0, 1.0)))) }

)
}

val g = f(data)

g.print()

env.execute("Flink Test")

}