eu.stratosphere.example.java.record.relational

Class TPCHQuery3.AggLiO

java.lang.Object

eu.stratosphere.api.common.functions.AbstractFunction

eu.stratosphere.api.java.record.functions.ReduceFunction

eu.stratosphere.example.java.record.relational.TPCHQuery3.AggLiO

All Implemented Interfaces:

Function, GenericReducer<Record,Record>, Serializable

Enclosing class:

TPCHQuery3

public static class TPCHQuery3.AggLiO
extends ReduceFunction
implements Serializable

Reduce PACT implements the sum aggregation. The Combinable annotation is set as the partial sums can be calculated already in the combiner

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TPCHQuery3.AggLiO()

Method Summary

Methods

Modifier and Type	Method and Description
void	combine(Iterator<Record> values, Collector<Record> out) Creates partial sums on the price attribute for each data batch.
void	reduce(Iterator<Record> values, Collector<Record> out) Implements the sum aggregation.

Methods inherited from class eu.stratosphere.api.common.functions.AbstractFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Methods inherited from interface eu.stratosphere.api.common.functions.Function

close, getRuntimeContext, open, setRuntimeContext

Constructor Detail

TPCHQuery3.AggLiO

public TPCHQuery3.AggLiO()

Method Detail

reduce

public void reduce(Iterator<Record> values,
          Collector<Record> out)

Implements the sum aggregation. Output Schema: 0:ORDERKEY 1:SHIPPRIORITY 2:SUM(EXTENDEDPRICE)

Specified by:

reduce in interface GenericReducer<Record,Record>

Specified by:

reduce in class ReduceFunction

combine

public void combine(Iterator<Record> values,
           Collector<Record> out)

Creates partial sums on the price attribute for each data batch.

Specified by:

combine in interface GenericReducer<Record,Record>

Overrides:

combine in class ReduceFunction