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

Class ListAggWithRetractAggFunction

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<StringData,ListAggWithRetractAggFunction.ListAggWithRetractAccumulator>

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

All Implemented Interfaces:

Serializable, FunctionDefinition

@Internal
public final class ListAggWithRetractAggFunction
extends BuiltInAggregateFunction<StringData,ListAggWithRetractAggFunction.ListAggWithRetractAccumulator>

Built-in LISTAGG with retraction aggregate function.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	ListAggWithRetractAggFunction.ListAggWithRetractAccumulator Accumulator for LISTAGG with retraction.

Constructor Summary

Constructors

Constructor and Description
ListAggWithRetractAggFunction()

Method Summary

Modifier and Type	Method and Description
void	accumulate(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc, StringData value)
ListAggWithRetractAggFunction.ListAggWithRetractAccumulator	createAccumulator() Creates and initializes the accumulator for this ImperativeAggregateFunction.
DataType	getAccumulatorDataType()
List<DataType>	getArgumentDataTypes()
DataType	getOutputDataType()
StringData	getValue(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc) Called every time when an aggregation result should be materialized.
void	merge(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc, Iterable<ListAggWithRetractAggFunction.ListAggWithRetractAccumulator> its)
void	resetAccumulator(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc)
void	retract(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc, StringData value)

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

Constructor Detail

ListAggWithRetractAggFunction

public ListAggWithRetractAggFunction()

Method Detail

getArgumentDataTypes

public List<DataType> getArgumentDataTypes()

Overrides:

getArgumentDataTypes in class BuiltInAggregateFunction<StringData,ListAggWithRetractAggFunction.ListAggWithRetractAccumulator>

getAccumulatorDataType

public DataType getAccumulatorDataType()

Overrides:

getAccumulatorDataType in class BuiltInAggregateFunction<StringData,ListAggWithRetractAggFunction.ListAggWithRetractAccumulator>

getOutputDataType

public DataType getOutputDataType()

Overrides:

getOutputDataType in class BuiltInAggregateFunction<StringData,ListAggWithRetractAggFunction.ListAggWithRetractAccumulator>

createAccumulator

public ListAggWithRetractAggFunction.ListAggWithRetractAccumulator createAccumulator()

Description copied from class: ImperativeAggregateFunction

Creates and initializes the accumulator for this ImperativeAggregateFunction.

The accumulator is an intermediate data structure that stores the aggregated values until a final aggregation result is computed.

Specified by:

createAccumulator in class ImperativeAggregateFunction<StringData,ListAggWithRetractAggFunction.ListAggWithRetractAccumulator>

Returns:

the accumulator with the initial value

accumulate

public void accumulate(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc,
                       StringData value)
                throws Exception

Throws:

Exception

retract

public void retract(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc,
                    StringData value)
             throws Exception

Throws:

Exception

merge

public void merge(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc,
                  Iterable<ListAggWithRetractAggFunction.ListAggWithRetractAccumulator> its)
           throws Exception

Throws:

Exception

getValue

public StringData getValue(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc)

Description copied from class: AggregateFunction

Called every time when an aggregation result should be materialized. The returned value could be either an early and incomplete result (periodically emitted as data arrives) or the final result of the aggregation.

Specified by:

getValue in class AggregateFunction<StringData,ListAggWithRetractAggFunction.ListAggWithRetractAccumulator>

Parameters:

acc - the accumulator which contains the current intermediate results

Returns:

the aggregation result

resetAccumulator

public void resetAccumulator(ListAggWithRetractAggFunction.ListAggWithRetractAccumulator acc)