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From "John Sandiford (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-1378) could not find implicit value for evidence parameter of type TypeInformation
Date Fri, 09 Jan 2015 14:00:36 GMT
John Sandiford created FLINK-1378:
-------------------------------------

             Summary: could not find implicit value for evidence parameter of type TypeInformation
                 Key: FLINK-1378
                 URL: https://issues.apache.org/jira/browse/FLINK-1378
             Project: Flink
          Issue Type: Bug
          Components: Scala API
    Affects Versions: 0.7.0-incubating
            Reporter: John Sandiford


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")


}




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