Package org.apache.flink.table.runtime.operators.window.tvf.common

Interface WindowAssigner

All Superinterfaces:
Serializable
All Known Subinterfaces:
SliceAssigner, SliceSharedAssigner, SliceUnsharedAssigner, UnsliceAssigner<W>
All Known Implementing Classes:
SliceAssigners.CumulativeSliceAssigner, SliceAssigners.HoppingSliceAssigner, SliceAssigners.SlicedSharedSliceAssigner, SliceAssigners.SlicedUnsharedSliceAssigner, SliceAssigners.TumblingSliceAssigner, SliceAssigners.WindowedSliceAssigner, UnsliceAssigners.SessionUnsliceAssigner, UnsliceAssigners.WindowedUnsliceAssigner
@Internal public interface WindowAssigner extends Serializable
WindowAssigner is used to assign windows to elements.

The differences between WindowAssigner and GroupWindowAssigner is that, this window assigner is translated from the new window TVF syntax, but the other is from the legacy GROUP WINDOW FUNCTION syntax. In the long future, GroupWindowAssigner will be dropped.

See more details in WindowAggOperator.

  • Method Summary

    Modifier and Type
    Method
    Description
    String
    getDescription()
    Returns a description of this window assigner.
    boolean
    isEventTime()
    Returns true if elements are assigned to windows based on event time, false based on processing time.

  • Method Details

    • isEventTime

      boolean isEventTime()
      Returns true if elements are assigned to windows based on event time, false based on processing time.

    • getDescription

      String getDescription()
      Returns a description of this window assigner.