Packages

c

org.apache.spark.sql.execution.window

UnboundedPrecedingWindowFunctionFrame

final class UnboundedPrecedingWindowFunctionFrame extends WindowFunctionFrame

The UnboundPreceding window frame calculates frames with the following SQL form: ... BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW

There is only an upper bound. Very common use cases are for instance running sums or counts (row_number). Technically this is a special case of a sliding window. However a sliding window has to maintain a buffer, and it must do a full evaluation everytime the buffer changes. This is not the case when there is no lower bound, given the additive nature of most aggregates streaming updates and partial evaluation suffice and no buffering is needed.

Linear Supertypes
WindowFunctionFrame, AnyRef, Any
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  1. UnboundedPrecedingWindowFunctionFrame
  2. WindowFunctionFrame
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Visibility
  1. Public
  2. Protected

Instance Constructors

  1. new UnboundedPrecedingWindowFunctionFrame(target: InternalRow, processor: AggregateProcessor, ubound: BoundOrdering)

    target

    to write results to.

    processor

    to calculate the row values with.

    ubound

    comparator used to identify the upper bound of an output row.

Value Members

  1. final def !=(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  2. final def ##: Int
    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean
    Definition Classes
    AnyRef → Any
  4. final def asInstanceOf[T0]: T0
    Definition Classes
    Any
  5. def clone(): AnyRef
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
  6. def currentLowerBound(): Int

    The current lower window bound in the row array (inclusive).

    The current lower window bound in the row array (inclusive).

    This should be called after the current row is updated via write.

    Definition Classes
    UnboundedPrecedingWindowFunctionFrame → WindowFunctionFrame
  7. def currentUpperBound(): Int

    The current row index of the upper window bound in the row array (exclusive)

    The current row index of the upper window bound in the row array (exclusive)

    This should be called after the current row is updated via write.

    Definition Classes
    UnboundedPrecedingWindowFunctionFrame → WindowFunctionFrame
  8. final def eq(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  9. def equals(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef → Any
  10. def finalize(): Unit
    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
  11. final def getClass(): Class[_ <: AnyRef]
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  12. def hashCode(): Int
    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  13. final def isInstanceOf[T0]: Boolean
    Definition Classes
    Any
  14. final def ne(arg0: AnyRef): Boolean
    Definition Classes
    AnyRef
  15. final def notify(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  16. final def notifyAll(): Unit
    Definition Classes
    AnyRef
    Annotations
    @native()
  17. def prepare(rows: ExternalAppendOnlyUnsafeRowArray): Unit

    Prepare the frame for calculating a new partition.

    Prepare the frame for calculating a new partition.

    rows

    to calculate the frame results for.

    Definition Classes
    UnboundedPrecedingWindowFunctionFrame → WindowFunctionFrame
  18. final def synchronized[T0](arg0: => T0): T0
    Definition Classes
    AnyRef
  19. def toString(): String
    Definition Classes
    AnyRef → Any
  20. final def wait(): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  21. final def wait(arg0: Long, arg1: Int): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
  22. final def wait(arg0: Long): Unit
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
  23. def write(index: Int, current: InternalRow): Unit

    Write the frame columns for the current row to the given target row.

    Write the frame columns for the current row to the given target row.

    Definition Classes
    UnboundedPrecedingWindowFunctionFrame → WindowFunctionFrame

Inherited from WindowFunctionFrame

Inherited from AnyRef

Inherited from Any

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