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

类 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>

所有已实现的接口:

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

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

Lag AggregateFunction.

另请参阅:

序列化表格

嵌套类概要

嵌套类

限定符和类型	类和说明
static class	LagAggFunction.LagAcc<T> Accumulator for LAG.

构造器概要

构造器

构造器和说明
LagAggFunction(org.apache.flink.table.types.logical.LogicalType[] valueTypes)

方法概要

限定符和类型	方法和说明
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)

从类继承的方法 org.apache.flink.table.runtime.functions.aggregate.BuiltInAggregateFunction

getRequirements, getTypeInference, isDeterministic

从类继承的方法 org.apache.flink.table.functions.AggregateFunction

getKind

从类继承的方法 org.apache.flink.table.functions.ImperativeAggregateFunction

getAccumulatorType, getResultType

从类继承的方法 org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, open, toString

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.table.functions.FunctionDefinition

supportsConstantFolding

构造器详细资料

LagAggFunction

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

方法详细资料

getArgumentDataTypes

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

覆盖:

getArgumentDataTypes 在类中 BuiltInAggregateFunction<T,LagAggFunction.LagAcc<T>>

getAccumulatorDataType

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

覆盖:

getAccumulatorDataType 在类中 BuiltInAggregateFunction<T,LagAggFunction.LagAcc<T>>

getOutputDataType

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

覆盖:

getOutputDataType 在类中 BuiltInAggregateFunction<T,LagAggFunction.LagAcc<T>>

accumulate

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

抛出:

Exception

accumulate

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

抛出:

Exception

accumulate

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

抛出:

Exception

resetAccumulator

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

抛出:

Exception

getValue

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

指定者:

getValue 在类中 org.apache.flink.table.functions.AggregateFunction<T,LagAggFunction.LagAcc<T>>

createAccumulator

public LagAggFunction.LagAcc<T> createAccumulator()

指定者:

createAccumulator 在类中 org.apache.flink.table.functions.ImperativeAggregateFunction<T,LagAggFunction.LagAcc<T>>