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  • package org
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  • package apache
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  • package flinkx
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    apache
  • package api
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    flinkx
  • class CoGroupedStreams[T1, T2] extends AnyRef

    CoGroupedStreams represents two DataStreams that have been co-grouped.

    CoGroupedStreams represents two DataStreams that have been co-grouped. A streaming co-group operation is evaluated over elements in a window.

    To finalize the co-group operation you also need to specify a KeySelector for both the first and second input and a WindowAssigner

    Note: Right now, the groups are being built in memory so you need to ensure that they don't get too big. Otherwise the JVM might crash.

    Example:

    val one: DataStream[(String, Int)]  = ...
val two: DataStream[(String, Int)] = ...

val result = one.coGroup(two)
    .where(new MyFirstKeySelector())
    .equalTo(new MyFirstKeySelector())
    .window(TumblingEventTimeWindows.of(Time.of(5, TimeUnit.SECONDS)))
    .apply(new MyCoGroupFunction())
}
    Definition Classes
    api
    Annotations
    @Public()
  • Where

class Where[KEY] extends AnyRef

A co-group operation that has KeySelectors defined for the first input.

You need to specify a KeySelector for the second input using equalTo() before you can proceed with specifying a WindowAssigner using EqualTo.window().

KEY

Type of the key. This must be the same for both inputs

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Instance Constructors

  1. new Where(keySelector1: KeySelector[T1, KEY], keyType: TypeInformation[KEY])

Type Members

  1. class EqualTo extends AnyRef

    A co-group operation that a KeySelector defined for the first and the second input.

    A co-group operation that a KeySelector defined for the first and the second input.

    A window can now be specified using window().

Value Members

  1. final def !=(arg0: Any): Boolean
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  2. final def ##(): Int
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  3. final def ==(arg0: Any): Boolean
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  4. final def asInstanceOf[T0]: T0
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  5. def clone(): AnyRef
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    @throws( ... ) @native() @HotSpotIntrinsicCandidate()
  6. final def eq(arg0: AnyRef): Boolean
    Definition Classes
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  7. def equalTo(keySelector: (T2) ⇒ KEY): EqualTo

    Specifies a KeySelector for elements from the second input.

  8. def equals(arg0: Any): Boolean
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  9. final def getClass(): Class[_]
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    @native() @HotSpotIntrinsicCandidate()
  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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  14. final def notifyAll(): Unit
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    @native() @HotSpotIntrinsicCandidate()
  15. final def synchronized[T0](arg0: ⇒ T0): T0
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  16. def toString(): String
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  17. final def wait(arg0: Long, arg1: Int): Unit
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  18. final def wait(arg0: Long): Unit
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  19. final def wait(): Unit
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    @throws( ... )

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  1. def finalize(): Unit
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    @throws( classOf[java.lang.Throwable] ) @Deprecated
    Deprecated

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