Package org.apache.flink.table.runtime.functions.aggregate

Class LagAggFunction<T>

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.ImperativeAggregateFunction<T,ACC>

org.apache.flink.table.functions.AggregateFunction<T,ACC>

org.apache.flink.table.runtime.functions.aggregate.BuiltInAggregateFunction<T,LagAggFunction.LagAcc<T>>

org.apache.flink.table.runtime.functions.aggregate.LagAggFunction<T>

All Implemented Interfaces:

Serializable, org.apache.flink.table.functions.FunctionDefinition

public class LagAggFunction<T>
extends BuiltInAggregateFunction<T,LagAggFunction.LagAcc<T>>

Lag AggregateFunction.

See Also:

• Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	LagAggFunction.LagAcc<T>	Accumulator for LAG.

Constructor Summary

Constructors

Constructor	Description
LagAggFunction(org.apache.flink.table.types.logical.LogicalType[] valueTypes)

Method Summary

Modifier and Type	Method	Description
void	accumulate(LagAggFunction.LagAcc<T> acc, T value)
void	accumulate(LagAggFunction.LagAcc<T> acc, T value, int offset)
void	accumulate(LagAggFunction.LagAcc<T> acc, T value, int offset, T defaultValue)
LagAggFunction.LagAcc<T>	createAccumulator()
org.apache.flink.table.types.DataType	getAccumulatorDataType()
List<org.apache.flink.table.types.DataType>	getArgumentDataTypes()
org.apache.flink.table.types.DataType	getOutputDataType()
T	getValue(LagAggFunction.LagAcc<T> acc)
void	resetAccumulator(LagAggFunction.LagAcc<T> acc)

Methods inherited from class org.apache.flink.table.runtime.functions.aggregate.BuiltInAggregateFunction

getRequirements, getTypeInference, isDeterministic

Methods inherited from class org.apache.flink.table.functions.AggregateFunction

getKind

Methods inherited from class org.apache.flink.table.functions.ImperativeAggregateFunction

getAccumulatorType, getResultType

Methods inherited from class org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, open, toString

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.table.functions.FunctionDefinition

supportsConstantFolding

Constructor Details

LagAggFunction

public LagAggFunction(org.apache.flink.table.types.logical.LogicalType[] valueTypes)

Method Details

getArgumentDataTypes

public List<org.apache.flink.table.types.DataType> getArgumentDataTypes()

Overrides:

getArgumentDataTypes in class BuiltInAggregateFunction<T,LagAggFunction.LagAcc<T>>

getAccumulatorDataType

public org.apache.flink.table.types.DataType getAccumulatorDataType()

Overrides:

getAccumulatorDataType in class BuiltInAggregateFunction<T,LagAggFunction.LagAcc<T>>

getOutputDataType

public org.apache.flink.table.types.DataType getOutputDataType()

Overrides:

getOutputDataType in class BuiltInAggregateFunction<T,LagAggFunction.LagAcc<T>>

accumulate

public void accumulate(LagAggFunction.LagAcc<T> acc,
 T value)
                throws Exception

Throws:

Exception

accumulate

public void accumulate(LagAggFunction.LagAcc<T> acc,
 T value,
 int offset)
                throws Exception

Throws:

Exception

accumulate

public void accumulate(LagAggFunction.LagAcc<T> acc,
 T value,
 int offset,
 T defaultValue)
                throws Exception

Throws:

Exception

resetAccumulator

public void resetAccumulator(LagAggFunction.LagAcc<T> acc)
                      throws Exception

Throws:

Exception

getValue

public T getValue(LagAggFunction.LagAcc<T> acc)

Specified by:

getValue in class org.apache.flink.table.functions.AggregateFunction<T,LagAggFunction.LagAcc<T>>

createAccumulator

public LagAggFunction.LagAcc<T> createAccumulator()

Specified by:

createAccumulator in class org.apache.flink.table.functions.ImperativeAggregateFunction<T,LagAggFunction.LagAcc<T>>