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

Class ArrayAggFunction<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<org.apache.flink.table.data.ArrayData,ArrayAggFunction.ArrayAggAccumulator<T>>

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

All Implemented Interfaces:

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

@Internal
public final class ArrayAggFunction<T>
extends BuiltInAggregateFunction<org.apache.flink.table.data.ArrayData,ArrayAggFunction.ArrayAggAccumulator<T>>

Built-in ARRAY_AGG aggregate function.

See Also:

Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ArrayAggFunction.ArrayAggAccumulator<T>	Accumulator for ARRAY_AGG with retraction.

Constructor Summary

Constructors

Constructor	Description
ArrayAggFunction(org.apache.flink.table.types.logical.LogicalType elementType, boolean ignoreNulls)

Method Summary

Modifier and Type	Method	Description
void	accumulate(ArrayAggFunction.ArrayAggAccumulator<T> acc, T value)
ArrayAggFunction.ArrayAggAccumulator<T>	createAccumulator()
org.apache.flink.table.types.DataType	getAccumulatorDataType()
List<org.apache.flink.table.types.DataType>	getArgumentDataTypes()
org.apache.flink.table.types.DataType	getOutputDataType()
org.apache.flink.table.data.ArrayData	getValue(ArrayAggFunction.ArrayAggAccumulator<T> acc)
void	merge(ArrayAggFunction.ArrayAggAccumulator<T> acc, Iterable<ArrayAggFunction.ArrayAggAccumulator<T>> its)
void	resetAccumulator(ArrayAggFunction.ArrayAggAccumulator<T> acc)
void	retract(ArrayAggFunction.ArrayAggAccumulator<T> acc, T 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

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

supportsConstantFolding

Constructor Detail

ArrayAggFunction

public ArrayAggFunction(org.apache.flink.table.types.logical.LogicalType elementType,
                        boolean ignoreNulls)

Method Detail

getArgumentDataTypes

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

Overrides:

getArgumentDataTypes in class BuiltInAggregateFunction<org.apache.flink.table.data.ArrayData,ArrayAggFunction.ArrayAggAccumulator<T>>

getAccumulatorDataType

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

Overrides:

getAccumulatorDataType in class BuiltInAggregateFunction<org.apache.flink.table.data.ArrayData,ArrayAggFunction.ArrayAggAccumulator<T>>

getOutputDataType

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

Overrides:

getOutputDataType in class BuiltInAggregateFunction<org.apache.flink.table.data.ArrayData,ArrayAggFunction.ArrayAggAccumulator<T>>

createAccumulator

public ArrayAggFunction.ArrayAggAccumulator<T> createAccumulator()

Specified by:

createAccumulator in class org.apache.flink.table.functions.ImperativeAggregateFunction<org.apache.flink.table.data.ArrayData,ArrayAggFunction.ArrayAggAccumulator<T>>

accumulate

public void accumulate(ArrayAggFunction.ArrayAggAccumulator<T> acc,
                       T value)
                throws Exception

Throws:

Exception

retract

public void retract(ArrayAggFunction.ArrayAggAccumulator<T> acc,
                    T value)
             throws Exception

Throws:

Exception

merge

public void merge(ArrayAggFunction.ArrayAggAccumulator<T> acc,
                  Iterable<ArrayAggFunction.ArrayAggAccumulator<T>> its)
           throws Exception

Throws:

Exception

getValue

public org.apache.flink.table.data.ArrayData getValue(ArrayAggFunction.ArrayAggAccumulator<T> acc)

Specified by:

getValue in class org.apache.flink.table.functions.AggregateFunction<org.apache.flink.table.data.ArrayData,ArrayAggFunction.ArrayAggAccumulator<T>>

resetAccumulator

public void resetAccumulator(ArrayAggFunction.ArrayAggAccumulator<T> acc)