Packages

  • package root
    Definition Classes
    root
  • package org
    Definition Classes
    root
  • package apache
    Definition Classes
    org
  • package flink
    Definition Classes
    apache
  • package api
    Definition Classes
    flink
  • package scala

    The Flink Scala API.

    The Flink Scala API. org.apache.flink.api.scala.ExecutionEnvironment is the starting-point of any Flink program. It can be used to read from local files, HDFS, or other sources. org.apache.flink.api.scala.DataSet is the main abstraction of data in Flink. It provides operations that create new DataSets via transformations. org.apache.flink.api.scala.GroupedDataSet provides operations on grouped data that results from org.apache.flink.api.scala.DataSet.groupBy().

    Use org.apache.flink.api.scala.ExecutionEnvironment.getExecutionEnvironment to obtain an execution environment. This will either create a local environment or a remote environment, depending on the context where your program is executing.

    Definition Classes
    api
    Deprecated

    All Flink Scala APIs are deprecated and will be removed in a future Flink version. You can still build your application in Scala, but you should move to the Java version of either the DataStream and/or Table API.

    See also

    FLIP-265 Deprecate and remove Scala API support

  • package extensions

    acceptPartialFunctions extends the original DataSet with methods with unique names that delegate to core higher-order functions (e.g.

    acceptPartialFunctions extends the original DataSet with methods with unique names that delegate to core higher-order functions (e.g. map) so that we can work around the fact that overloaded methods taking functions as parameters can't accept partial functions as well. This enables the possibility to directly apply pattern matching to decompose inputs such as tuples, case classes and collections.

    The following is a small example that showcases how this extensions would work on a Flink data set:

    object Main {
      import org.apache.flink.api.scala.extensions._
      case class Point(x: Double, y: Double)
      def main(args: Array[String]): Unit = {
        val env = ExecutionEnvironment.getExecutionEnvironment
        val ds = env.fromElements(Point(1, 2), Point(3, 4), Point(5, 6))
        ds.filterWith {
          case Point(x, _) => x > 1
        }.reduceWith {
          case (Point(x1, y1), (Point(x2, y2))) => Point(x1 + y1, x2 + y2)
        }.mapWith {
          case Point(x, y) => (x, y)
        }.flatMapWith {
          case (x, y) => Seq('x' -> x, 'y' -> y)
        }.groupingBy {
          case (id, value) => id
        }
      }
    }

    The extension consists of several implicit conversions over all the data set representations that could gain from this feature. To use this set of extensions methods the user has to explicitly opt-in by importing org.apache.flink.api.scala.extensions.acceptPartialFunctions.

    For more information and usage examples please consult the Apache Flink official documentation.

    Definition Classes
    scala
    Deprecated

    All Flink Scala APIs are deprecated and will be removed in a future Flink major version. You can still build your application in Scala, but you should move to the Java version of either the DataStream and/or Table API.

    See also

    FLIP-265 Deprecate and remove Scala API support

  • package impl
    Definition Classes
    extensions
  • package acceptPartialFunctions
    Definition Classes
    impl
  • OnCoGroupDataSet
  • OnCrossDataSet
  • OnDataSet
  • OnGroupedDataSet
  • OnHalfUnfinishedKeyPairOperation
  • OnJoinFunctionAssigner
  • OnUnfinishedKeyPairOperation

class OnUnfinishedKeyPairOperation[L, R, O] extends AnyRef

Wraps an unfinished key pair operation, allowing to use anonymous partial functions to perform extraction of items in a tuple, case class instance or collection

L

The type of the left data set items

R

The type of the right data set items

O

The type of the output data set items

Annotations
@deprecated
Deprecated

(Since version 1.18.0)

See also

FLIP-265 Deprecate and remove Scala API support

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Instance Constructors

  1. new OnUnfinishedKeyPairOperation(ds: UnfinishedKeyPairOperation[L, R, O])

    ds

    The wrapped unfinished key pair operation data set

    Deprecated

    All Flink Scala APIs are deprecated and will be removed in a future Flink major version. You can still build your application in Scala, but you should move to the Java version of either the DataStream and/or Table API.

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  5. def clone(): AnyRef
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    @native() @throws( ... )
  6. final def eq(arg0: AnyRef): Boolean
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  7. def equals(arg0: Any): Boolean
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  8. def finalize(): Unit
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    @throws( classOf[java.lang.Throwable] )
  9. final def getClass(): Class[_]
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    @native()
  10. def hashCode(): Int
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  11. final def isInstanceOf[T0]: Boolean
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  12. final def ne(arg0: AnyRef): Boolean
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  13. final def notify(): Unit
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    @native()
  14. final def notifyAll(): Unit
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    @native()
  15. final def synchronized[T0](arg0: ⇒ T0): T0
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  16. def toString(): String
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  17. final def wait(): Unit
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    @throws( ... )
  18. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
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    @throws( ... )
  19. final def wait(arg0: Long): Unit
    Definition Classes
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    @native() @throws( ... )
  20. def whereClause[K](fun: (L) ⇒ K)(implicit arg0: TypeInformation[K]): HalfUnfinishedKeyPairOperation[L, R, O]

    Initiates a join or co-group operation, defining the first half of the where clause with the items of the left data set that will be checked for equality with the ones provided by the second half.

    Initiates a join or co-group operation, defining the first half of the where clause with the items of the left data set that will be checked for equality with the ones provided by the second half.

    K

    The type of the key, for which type information must be known

    fun

    The function that defines the comparing item of the where clause

    returns

    A data set of Os

    Annotations
    @PublicEvolving()

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