Class

com.datastax.spark.connector.util

MultiMergeJoinIterator

Related Doc: package util

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class MultiMergeJoinIterator[T, K] extends Iterator[Seq[Seq[T]]]

An iterator that preforms a mergeJoin among ordered iterators joining on a given key. The input iterators are assumed to be ordered so we can do a greedy merge join. Since our iterators are lazy we cannot check that they are ordered before starting.

Example:

val list1 = Seq( (1, "a"), (2, "a") , (3, "a") )
val list2 = Seq( (1, "b"), (2, "b") , (3, "b") )
val iterator = new MultiMergeJoinIterator(
  Seq(list1.iterator,list2.iterator),
  (x: (Int, String)) => x._1,
)
val result = iterator.toSeq
// (Seq((1, "a")), Seq((1, "b"))),
// (Seq((2, "a")), Seq((2, "b"))),
// (Seq((3, "a")), Seq((3, "b")))
Linear Supertypes
Iterator[Seq[Seq[T]]], TraversableOnce[Seq[Seq[T]]], GenTraversableOnce[Seq[Seq[T]]], AnyRef, Any
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Inherited
  1. MultiMergeJoinIterator
  2. Iterator
  3. TraversableOnce
  4. GenTraversableOnce
  5. AnyRef
  6. Any
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Visibility
  1. Public
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Instance Constructors

  1. new MultiMergeJoinIterator(iterators: Seq[Iterator[T]], keyExtract: (T) ⇒ K)(implicit order: Ordering[K])

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Type Members

  1. class GroupedIterator[B >: A] extends AbstractIterator[Seq[B]] with Iterator[Seq[B]]

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    Definition Classes
    Iterator

Value Members

  1. final def !=(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  2. final def ##(): Int

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    Definition Classes
    AnyRef → Any

  3. def ++[B >: Seq[Seq[T]]](that: ⇒ GenTraversableOnce[B]): Iterator[B]

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    Definition Classes
    Iterator

  4. def /:[B](z: B)(op: (B, Seq[Seq[T]]) ⇒ B): B

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  5. def :\[B](z: B)(op: (Seq[Seq[T]], B) ⇒ B): B

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  6. final def ==(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  7. def addString(b: StringBuilder): StringBuilder

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    Definition Classes
    TraversableOnce

  8. def addString(b: StringBuilder, sep: String): StringBuilder

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    Definition Classes
    TraversableOnce

  9. def addString(b: StringBuilder, start: String, sep: String, end: String): StringBuilder

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    Definition Classes
    TraversableOnce

  10. def aggregate[B](z: ⇒ B)(seqop: (B, Seq[Seq[T]]) ⇒ B, combop: (B, B) ⇒ B): B

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  11. final def asInstanceOf[T0]: T0

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    Definition Classes
    Any

  12. def buffered: BufferedIterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  13. def clone(): AnyRef

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  14. def collect[B](pf: PartialFunction[Seq[Seq[T]], B]): Iterator[B]

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    Definition Classes
    Iterator
    Annotations
    @migration
    Migration

    (Changed in version 2.8.0) collect has changed. The previous behavior can be reproduced with toSeq.

  15. def collectFirst[B](pf: PartialFunction[Seq[Seq[T]], B]): Option[B]

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    Definition Classes
    TraversableOnce

  16. def contains(elem: Any): Boolean

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    Definition Classes
    Iterator

  17. def copyToArray[B >: Seq[Seq[T]]](xs: Array[B], start: Int, len: Int): Unit

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  18. def copyToArray[B >: Seq[Seq[T]]](xs: Array[B]): Unit

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  19. def copyToArray[B >: Seq[Seq[T]]](xs: Array[B], start: Int): Unit

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  20. def copyToBuffer[B >: Seq[Seq[T]]](dest: Buffer[B]): Unit

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    Definition Classes
    TraversableOnce

  21. def corresponds[B](that: GenTraversableOnce[B])(p: (Seq[Seq[T]], B) ⇒ Boolean): Boolean

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    Definition Classes
    Iterator

  22. def count(p: (Seq[Seq[T]]) ⇒ Boolean): Int

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  23. def drop(n: Int): Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  24. def dropWhile(p: (Seq[Seq[T]]) ⇒ Boolean): Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  25. def duplicate: (Iterator[Seq[Seq[T]]], Iterator[Seq[Seq[T]]])

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    Definition Classes
    Iterator

  26. final def eq(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  27. def equals(arg0: Any): Boolean

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    Definition Classes
    AnyRef → Any

  28. def exists(p: (Seq[Seq[T]]) ⇒ Boolean): Boolean

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  29. def filter(p: (Seq[Seq[T]]) ⇒ Boolean): Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  30. def filterNot(p: (Seq[Seq[T]]) ⇒ Boolean): Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  31. def finalize(): Unit

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    Attributes
    protected[java.lang]
    Definition Classes
    AnyRef
    Annotations
    @throws( classOf[java.lang.Throwable] )

  32. def find(p: (Seq[Seq[T]]) ⇒ Boolean): Option[Seq[Seq[T]]]

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  33. def flatMap[B](f: (Seq[Seq[T]]) ⇒ GenTraversableOnce[B]): Iterator[B]

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    Definition Classes
    Iterator

  34. def fold[A1 >: Seq[Seq[T]]](z: A1)(op: (A1, A1) ⇒ A1): A1

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  35. def foldLeft[B](z: B)(op: (B, Seq[Seq[T]]) ⇒ B): B

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  36. def foldRight[B](z: B)(op: (Seq[Seq[T]], B) ⇒ B): B

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  37. def forall(p: (Seq[Seq[T]]) ⇒ Boolean): Boolean

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  38. def foreach[U](f: (Seq[Seq[T]]) ⇒ U): Unit

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  39. final def getClass(): Class[_]

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    Definition Classes
    AnyRef → Any

  40. def grouped[B >: Seq[Seq[T]]](size: Int): GroupedIterator[B]

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    Definition Classes
    Iterator

  41. def hasDefiniteSize: Boolean

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  42. def hasNext: Boolean

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    Definition Classes
    MultiMergeJoinIterator → Iterator

  43. def hashCode(): Int

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    Definition Classes
    AnyRef → Any

  44. def indexOf[B >: Seq[Seq[T]]](elem: B): Int

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    Definition Classes
    Iterator

  45. def indexWhere(p: (Seq[Seq[T]]) ⇒ Boolean): Int

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    Definition Classes
    Iterator

  46. def isEmpty: Boolean

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  47. final def isInstanceOf[T0]: Boolean

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    Definition Classes
    Any

  48. def isTraversableAgain: Boolean

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    Definition Classes
    Iterator → GenTraversableOnce

  49. def length: Int

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    Definition Classes
    Iterator

  50. def map[B](f: (Seq[Seq[T]]) ⇒ B): Iterator[B]

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    Definition Classes
    Iterator

  51. def max[B >: Seq[Seq[T]]](implicit cmp: Ordering[B]): Seq[Seq[T]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  52. def maxBy[B](f: (Seq[Seq[T]]) ⇒ B)(implicit cmp: Ordering[B]): Seq[Seq[T]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  53. def min[B >: Seq[Seq[T]]](implicit cmp: Ordering[B]): Seq[Seq[T]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  54. def minBy[B](f: (Seq[Seq[T]]) ⇒ B)(implicit cmp: Ordering[B]): Seq[Seq[T]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  55. def mkString: String

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  56. def mkString(sep: String): String

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  57. def mkString(start: String, sep: String, end: String): String

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  58. final def ne(arg0: AnyRef): Boolean

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    Definition Classes
    AnyRef

  59. def next(): Seq[Seq[T]]

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    We need to determine which iterator is behind since we are assuming sorted order.

    We need to determine which iterator is behind since we are assuming sorted order. We got smallest key from it and then pull all elements with that smallest key from all other iterators.

    Definition Classes
    MultiMergeJoinIterator → Iterator

  60. def nonEmpty: Boolean

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  61. final def notify(): Unit

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    Definition Classes
    AnyRef

  62. final def notifyAll(): Unit

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    Definition Classes
    AnyRef

  63. def padTo[A1 >: Seq[Seq[T]]](len: Int, elem: A1): Iterator[A1]

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    Definition Classes
    Iterator

  64. def partition(p: (Seq[Seq[T]]) ⇒ Boolean): (Iterator[Seq[Seq[T]]], Iterator[Seq[Seq[T]]])

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    Definition Classes
    Iterator

  65. def patch[B >: Seq[Seq[T]]](from: Int, patchElems: Iterator[B], replaced: Int): Iterator[B]

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    Definition Classes
    Iterator

  66. def product[B >: Seq[Seq[T]]](implicit num: Numeric[B]): B

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  67. def reduce[A1 >: Seq[Seq[T]]](op: (A1, A1) ⇒ A1): A1

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  68. def reduceLeft[B >: Seq[Seq[T]]](op: (B, Seq[Seq[T]]) ⇒ B): B

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    Definition Classes
    TraversableOnce

  69. def reduceLeftOption[B >: Seq[Seq[T]]](op: (B, Seq[Seq[T]]) ⇒ B): Option[B]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  70. def reduceOption[A1 >: Seq[Seq[T]]](op: (A1, A1) ⇒ A1): Option[A1]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  71. def reduceRight[B >: Seq[Seq[T]]](op: (Seq[Seq[T]], B) ⇒ B): B

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  72. def reduceRightOption[B >: Seq[Seq[T]]](op: (Seq[Seq[T]], B) ⇒ B): Option[B]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  73. def reversed: List[Seq[Seq[T]]]

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    Attributes
    protected[this]
    Definition Classes
    TraversableOnce

  74. def sameElements(that: Iterator[_]): Boolean

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    Definition Classes
    Iterator

  75. def scanLeft[B](z: B)(op: (B, Seq[Seq[T]]) ⇒ B): Iterator[B]

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    Definition Classes
    Iterator

  76. def scanRight[B](z: B)(op: (Seq[Seq[T]], B) ⇒ B): Iterator[B]

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    Definition Classes
    Iterator

  77. def seq: Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  78. def size: Int

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  79. def slice(from: Int, until: Int): Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  80. def sliding[B >: Seq[Seq[T]]](size: Int, step: Int): GroupedIterator[B]

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    Definition Classes
    Iterator

  81. def span(p: (Seq[Seq[T]]) ⇒ Boolean): (Iterator[Seq[Seq[T]]], Iterator[Seq[Seq[T]]])

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    Definition Classes
    Iterator

  82. def sum[B >: Seq[Seq[T]]](implicit num: Numeric[B]): B

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  83. final def synchronized[T0](arg0: ⇒ T0): T0

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    Definition Classes
    AnyRef

  84. def take(n: Int): Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  85. def takeWhile(p: (Seq[Seq[T]]) ⇒ Boolean): Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  86. def to[Col[_]](implicit cbf: CanBuildFrom[Nothing, Seq[Seq[T]], Col[Seq[Seq[T]]]]): Col[Seq[Seq[T]]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  87. def toArray[B >: Seq[Seq[T]]](implicit arg0: ClassTag[B]): Array[B]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  88. def toBuffer[B >: Seq[Seq[T]]]: Buffer[B]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  89. def toIndexedSeq: IndexedSeq[Seq[Seq[T]]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  90. def toIterable: Iterable[Seq[Seq[T]]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  91. def toIterator: Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator → GenTraversableOnce

  92. def toList: List[Seq[Seq[T]]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  93. def toMap[T, U](implicit ev: <:<[Seq[Seq[T]], (T, U)]): Map[T, U]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  94. def toSeq: Seq[Seq[Seq[T]]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  95. def toSet[B >: Seq[Seq[T]]]: Set[B]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  96. def toStream: Stream[Seq[Seq[T]]]

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    Definition Classes
    Iterator → GenTraversableOnce

  97. def toString(): String

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    Definition Classes
    Iterator → AnyRef → Any

  98. def toTraversable: Traversable[Seq[Seq[T]]]

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    Definition Classes
    Iterator → TraversableOnce → GenTraversableOnce

  99. def toVector: Vector[Seq[Seq[T]]]

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    Definition Classes
    TraversableOnce → GenTraversableOnce

  100. final def wait(): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  101. final def wait(arg0: Long, arg1: Int): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  102. final def wait(arg0: Long): Unit

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    Definition Classes
    AnyRef
    Annotations
    @throws( ... )

  103. def withFilter(p: (Seq[Seq[T]]) ⇒ Boolean): Iterator[Seq[Seq[T]]]

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    Definition Classes
    Iterator

  104. def zip[B](that: Iterator[B]): Iterator[(Seq[Seq[T]], B)]

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    Definition Classes
    Iterator

  105. def zipAll[B, A1 >: Seq[Seq[T]], B1 >: B](that: Iterator[B], thisElem: A1, thatElem: B1): Iterator[(A1, B1)]

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    Definition Classes
    Iterator

  106. def zipWithIndex: Iterator[(Seq[Seq[T]], Int)]

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    Definition Classes
    Iterator

Inherited from Iterator[Seq[Seq[T]]]

Inherited from TraversableOnce[Seq[Seq[T]]]

Inherited from GenTraversableOnce[Seq[Seq[T]]]

Inherited from AnyRef

Inherited from Any

Ungrouped