org.apache.flink.table.runtime.operators.window.tvf.slicing

Interface SlicingWindowProcessor<W>

All Superinterfaces:

Serializable, WindowProcessor<W>

All Known Implementing Classes:

AbstractSliceWindowAggProcessor, RowTimeWindowDeduplicateProcessor, SliceSharedWindowAggProcessor, SliceUnsharedWindowAggProcessor, WindowRankProcessor

@Internal
public interface SlicingWindowProcessor<W>
extends WindowProcessor<W>

The SlicingWindowProcessor is an optimized processing for aligned windows which can apply the slicing optimization. The core idea of slicing optimization is to divide all elements from a data stream into a finite number of non-overlapping chunks (a.k.a. slices).

Concept of Slice

Dividing a window of aligned windows into a finite number of non-overlapping chunks, where the chunks are slices. It has the following properties:

• An element must only belong to a single slice.
• Slices are non-overlapping, i.e. S_i and S_j should not have any shared elements if i != j.
• A window is consist of a finite number of slices.

The SlicingWindowProcessor have different implementation for aggregate and topk or others.

The SlicingWindowProcessor usually leverages the SliceAssigner to assign slices and calculate based on the slices. See SliceSharedWindowAggProcessor as an example.

Note: since SlicingWindowProcessor leverages slicing optimization for aligned windows, therefore, it doesn't support unaligned windows, e.g. session window.

See more details in WindowAggOperator.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.flink.table.runtime.operators.window.tvf.common.WindowProcessor

WindowProcessor.Context<W>

Method Summary

Methods inherited from interface org.apache.flink.table.runtime.operators.window.tvf.common.WindowProcessor

advanceProgress, clearWindow, close, createWindowSerializer, fireWindow, initializeWatermark, open, prepareCheckpoint, processElement