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

Class FirstValueAggFunction<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,org.apache.flink.table.data.RowData>

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

All Implemented Interfaces:

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

@Internal
public final class FirstValueAggFunction<T>
extends BuiltInAggregateFunction<T,org.apache.flink.table.data.RowData>

Built-in FIRST_VALUE aggregate function.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
FirstValueAggFunction(org.apache.flink.table.types.logical.LogicalType valueType)

Method Summary

Modifier and Type	Method and Description
void	accumulate(org.apache.flink.table.data.RowData rowData, Object value)
void	accumulate(org.apache.flink.table.data.RowData rowData, Object value, Long order)
void	accumulate(org.apache.flink.table.data.RowData rowData, org.apache.flink.table.data.StringData value)
void	accumulate(org.apache.flink.table.data.RowData rowData, org.apache.flink.table.data.StringData value, Long order)
org.apache.flink.table.data.RowData	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(org.apache.flink.table.data.RowData acc)
boolean	isDeterministic()
void	resetAccumulator(org.apache.flink.table.data.RowData rowData)

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

getRequirements, getTypeInference

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

Constructor Detail

FirstValueAggFunction

public FirstValueAggFunction(org.apache.flink.table.types.logical.LogicalType valueType)

Method Detail

getArgumentDataTypes

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

Overrides:

getArgumentDataTypes in class BuiltInAggregateFunction<T,org.apache.flink.table.data.RowData>

getAccumulatorDataType

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

Overrides:

getAccumulatorDataType in class BuiltInAggregateFunction<T,org.apache.flink.table.data.RowData>

getOutputDataType

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

Overrides:

getOutputDataType in class BuiltInAggregateFunction<T,org.apache.flink.table.data.RowData>

isDeterministic

public boolean isDeterministic()

Specified by:

isDeterministic in interface org.apache.flink.table.functions.FunctionDefinition

Overrides:

isDeterministic in class BuiltInAggregateFunction<T,org.apache.flink.table.data.RowData>

createAccumulator

public org.apache.flink.table.data.RowData createAccumulator()

Specified by:

createAccumulator in class org.apache.flink.table.functions.ImperativeAggregateFunction<T,org.apache.flink.table.data.RowData>

accumulate

public void accumulate(org.apache.flink.table.data.RowData rowData,
                       Object value)

accumulate

public void accumulate(org.apache.flink.table.data.RowData rowData,
                       Object value,
                       Long order)

accumulate

public void accumulate(org.apache.flink.table.data.RowData rowData,
                       org.apache.flink.table.data.StringData value)

accumulate

public void accumulate(org.apache.flink.table.data.RowData rowData,
                       org.apache.flink.table.data.StringData value,
                       Long order)

resetAccumulator

public void resetAccumulator(org.apache.flink.table.data.RowData rowData)

getValue

public T getValue(org.apache.flink.table.data.RowData acc)

Specified by:

getValue in class org.apache.flink.table.functions.AggregateFunction<T,org.apache.flink.table.data.RowData>