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

Class AggregateWindowOperator<K,W extends Window>

java.lang.Object

org.apache.flink.streaming.api.operators.AbstractStreamOperator<RowData>

org.apache.flink.table.runtime.operators.window.groupwindow.operator.WindowOperator<K,W>

org.apache.flink.table.runtime.operators.window.groupwindow.operator.AggregateWindowOperator<K,W>

Type Parameters:

K - The type of key returned by the KeySelector.

W - The type of Window that the WindowAssigner assigns.

All Implemented Interfaces:

Serializable, CheckpointListener, Input<RowData>, KeyContext, KeyContextHandler, OneInputStreamOperator<RowData,RowData>, StreamOperator<RowData>, StreamOperatorStateHandler.CheckpointedStreamOperator, Triggerable<K,W>, YieldingOperator<RowData>

public class AggregateWindowOperator<K,W extends Window>
extends WindowOperator<K,W>

A WindowOperator for grouped window aggregates.

When an element arrives it gets assigned a key using a KeySelector and it gets assigned to zero or more windows using a GroupWindowAssigner. Based on this, the element is put into panes. A pane is the bucket of elements that have the same key and same Window. An element can be in multiple panes if it was assigned to multiple windows by the WindowAssigner.

Each pane gets its own instance of the provided Trigger. This trigger determines when the contents of the pane should be processed to emit results. When a trigger fires, the given NamespaceAggsHandleFunction.getValue(Object) is invoked to produce the results that are emitted for the pane to which the Trigger belongs.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field	Description
protected RecordEqualiser	equaliser	The util to compare two RowData equals to each other.

Fields inherited from class org.apache.flink.table.runtime.operators.window.groupwindow.operator.WindowOperator

collector, previousState, produceUpdates, recordCounter, shiftTimeZone, windowAggregator, windowFunction

Fields inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

combinedWatermark, config, lastRecordAttributes1, lastRecordAttributes2, latencyStats, LOG, metrics, output, processingTimeService, stateHandler, stateKeySelector1, stateKeySelector2, timeServiceManager

Method Summary

Modifier and Type	Method	Description
protected void	compileGeneratedCode()
protected void	emitWindowResult(W window)	Emits the window result of the given window.
void	open()	This method is called immediately before any elements are processed, it should contain the operator's initialization logic, e.g. state initialization.

Methods inherited from class org.apache.flink.table.runtime.operators.window.groupwindow.operator.WindowOperator

close, getNumLateRecordsDropped, getWatermarkLatency, onEventTime, onProcessingTime, processElement, useSplittableTimers

Methods inherited from class org.apache.flink.streaming.api.operators.AbstractStreamOperator

finish, getContainingTask, getCurrentKey, getExecutionConfig, getInternalTimerService, getKeyedStateBackend, getKeyedStateStore, getMetricGroup, getOperatorConfig, getOperatorID, getOperatorName, getOperatorStateBackend, getOrCreateKeyedState, getPartitionedState, getPartitionedState, getProcessingTimeService, getRuntimeContext, getStateKeySelector1, getStateKeySelector2, getTimeServiceManager, getUserCodeClassloader, hasKeyContext1, hasKeyContext2, initializeState, initializeState, isAsyncStateProcessingEnabled, isUsingCustomRawKeyedState, notifyCheckpointAborted, notifyCheckpointComplete, prepareSnapshotPreBarrier, processLatencyMarker, processLatencyMarker1, processLatencyMarker2, processRecordAttributes, processRecordAttributes1, processRecordAttributes2, processWatermark, processWatermark1, processWatermark2, processWatermarkStatus, processWatermarkStatus, processWatermarkStatus1, processWatermarkStatus2, reportOrForwardLatencyMarker, setCurrentKey, setKeyContextElement1, setKeyContextElement2, setMailboxExecutor, setProcessingTimeService, setup, snapshotState, snapshotState

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.apache.flink.api.common.state.CheckpointListener

notifyCheckpointAborted, notifyCheckpointComplete

Methods inherited from interface org.apache.flink.streaming.api.operators.Input

processLatencyMarker, processRecordAttributes, processWatermark, processWatermarkStatus

Methods inherited from interface org.apache.flink.streaming.api.operators.KeyContext

getCurrentKey, setCurrentKey

Methods inherited from interface org.apache.flink.streaming.api.operators.KeyContextHandler

hasKeyContext

Methods inherited from interface org.apache.flink.streaming.api.operators.OneInputStreamOperator

setKeyContextElement

Methods inherited from interface org.apache.flink.streaming.api.operators.StreamOperator

finish, getMetricGroup, getOperatorAttributes, getOperatorID, initializeState, prepareSnapshotPreBarrier, setKeyContextElement1, setKeyContextElement2, snapshotState

Field Detail

equaliser

protected RecordEqualiser equaliser

The util to compare two RowData equals to each other. As different RowData can't be equals directly, we use a code generated util to handle this.

Method Detail

open

public void open()
          throws Exception

Description copied from class: AbstractStreamOperator

This method is called immediately before any elements are processed, it should contain the operator's initialization logic, e.g. state initialization.

The default implementation does nothing.

Specified by:

open in interface StreamOperator<K>

Overrides:

open in class WindowOperator<K,W extends Window>

Throws:

Exception - An exception in this method causes the operator to fail.

compileGeneratedCode

protected void compileGeneratedCode()

Specified by:

compileGeneratedCode in class WindowOperator<K,W extends Window>

emitWindowResult

protected void emitWindowResult(W window)
                         throws Exception

Description copied from class: WindowOperator

Emits the window result of the given window.

Specified by:

emitWindowResult in class WindowOperator<K,W extends Window>

Throws:

Exception