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abstract class WindowFunctionFrame extends AnyRef

A window function calculates the results of a number of window functions for a window frame. Before use a frame must be prepared by passing it all the rows in the current partition. After preparation the update method can be called to fill the output rows.

Note: WindowFunctionFrame instances are reused during window execution. The prepare method will be called before processing the next partition, and must reset the states.

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Known Subclasses
FrameLessOffsetWindowFunctionFrame, OffsetWindowFunctionFrameBase, SlidingWindowFunctionFrame, UnboundedFollowingWindowFunctionFrame, UnboundedOffsetWindowFunctionFrame, UnboundedPrecedingOffsetWindowFunctionFrame, UnboundedPrecedingWindowFunctionFrame, UnboundedWindowFunctionFrame
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Instance Constructors

  1. new WindowFunctionFrame()

Abstract Value Members

  1. abstract 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.

  2. abstract 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.

  3. abstract def prepare(rows: ExternalAppendOnlyUnsafeRowArray): Unit

    Prepare the frame for calculating the results for a partition.

    Prepare the frame for calculating the results for a partition.

    rows

    to calculate the frame results for.

  4. abstract def write(index: Int, current: InternalRow): Unit

    Write the current results to the target row.

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