org.apache.flink.api.table.runtime

Class NoExpressionAggregateFunction

java.lang.Object

org.apache.flink.api.table.runtime.NoExpressionAggregateFunction

All Implemented Interfaces:

Serializable, Function, GroupCombineFunction<Row,Row>, GroupReduceFunction<Row,Row>

public class NoExpressionAggregateFunction
extends Object
implements GroupReduceFunction<Row,Row>, GroupCombineFunction<Row,Row>

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
NoExpressionAggregateFunction()

Method Summary

Modifier and Type	Method and Description
void	combine(Iterable<Row> in, Collector<Row> out) The combine method, called (potentially multiple timed) with subgroups of elements.
void	reduce(Iterable<Row> in, Collector<Row> out) The reduce method.

Methods inherited from class java.lang.Object

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

Constructor Detail

NoExpressionAggregateFunction

public NoExpressionAggregateFunction()

Method Detail

reduce

public void reduce(Iterable<Row> in,
                   Collector<Row> out)

Description copied from interface: GroupReduceFunction

The reduce method. The function receives one call per group of elements.

Specified by:

reduce in interface GroupReduceFunction<Row,Row>

Parameters:

in - All records that belong to the given input key.

out - The collector to hand results to.

combine

public void combine(Iterable<Row> in,
                    Collector<Row> out)

Description copied from interface: GroupCombineFunction

The combine method, called (potentially multiple timed) with subgroups of elements.

Specified by:

combine in interface GroupCombineFunction<Row,Row>

Parameters:

in - The elements to be combined.

out - The collector to use to return values from the function.