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

Class ListAggWsWithRetractAggFunction

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,ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator>

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

All Implemented Interfaces:

Serializable, FunctionDefinition

@Internal
public final class ListAggWsWithRetractAggFunction
extends BuiltInAggregateFunction<StringData,ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator>

Built-in LISTAGGWS with retraction aggregate function.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator	Accumulator for LISTAGGWS with retraction.

Constructor Summary

Constructors

Constructor	Description
ListAggWsWithRetractAggFunction()

Method Summary

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

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 Detail

ListAggWsWithRetractAggFunction

public ListAggWsWithRetractAggFunction()

Method Detail

getArgumentDataTypes

public List<DataType> getArgumentDataTypes()

Overrides:

getArgumentDataTypes in class BuiltInAggregateFunction<StringData,ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator>

getAccumulatorDataType

public DataType getAccumulatorDataType()

Overrides:

getAccumulatorDataType in class BuiltInAggregateFunction<StringData,ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator>

getOutputDataType

public DataType getOutputDataType()

Overrides:

getOutputDataType in class BuiltInAggregateFunction<StringData,ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator>

createAccumulator

public ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator 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,ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator>

Returns:

the accumulator with the initial value

accumulate

public void accumulate(ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator acc,
                       StringData value,
                       StringData lineDelimiter)
                throws Exception

Throws:

Exception

retract

public void retract(ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator acc,
                    StringData value,
                    StringData lineDelimiter)
             throws Exception

Throws:

Exception

merge

public void merge(ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator acc,
                  Iterable<ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator> its)
           throws Exception

Throws:

Exception

getValue

public StringData getValue(ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator 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,ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator>

Parameters:

acc - the accumulator which contains the current intermediate results

Returns:

the aggregation result

resetAccumulator

public void resetAccumulator(ListAggWsWithRetractAggFunction.ListAggWsWithRetractAccumulator acc)