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

Interface MergeCallback<W,R>

Type Parameters:
W - The type Window for windows or the type Long for slices that this callback used to merge.
R - The result type like Collection or Iterable to specify which slices or windows should be merged.
All Known Implementing Classes:
SliceSharedSyncStateWindowAggProcessor
public interface MergeCallback<W,R>
Callback to be used in when merging slices or windows for specifying which slices or windows should be merged.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    merge(W mergeResult, R toBeMerged)
    Specifies that states of the given windows or slices should be merged into the result window or slice.

  • Method Details

    • merge

      void merge(@Nullable W mergeResult, R toBeMerged) throws Exception
      Specifies that states of the given windows or slices should be merged into the result window or slice.
      Parameters:
      mergeResult - The resulting merged window or slice, null if it represents a non-state namespace.
      toBeMerged - Windows or slices that should be merged into one window or slice.
      Throws:
      Exception