eu.stratosphere.example.java.record.relational

Class TPCHQueryAsterix.AggCO

java.lang.Object

eu.stratosphere.api.common.functions.AbstractFunction

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

eu.stratosphere.example.java.record.relational.TPCHQueryAsterix.AggCO

All Implemented Interfaces:

Function, GenericReducer<Record,Record>, Serializable

Enclosing class:

TPCHQueryAsterix

public static class TPCHQueryAsterix.AggCO
extends ReduceFunction
implements Serializable

Reduce PACT implements the aggregation of the results. The Combinable annotation is set as the partial counts can be calculated already in the combiner

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
TPCHQueryAsterix.AggCO()

Method Summary

Methods

Modifier and Type	Method and Description
void	combine(Iterator<Record> records, Collector<Record> out) Computes partial counts
void	reduce(Iterator<Record> records, Collector<Record> out) Output Schema: 0: COUNT 1: C_MKTSEGMENT

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

TPCHQueryAsterix.AggCO

public TPCHQueryAsterix.AggCO()

Method Detail

reduce

public void reduce(Iterator<Record> records,
          Collector<Record> out)
            throws Exception

Output Schema: 0: COUNT 1: C_MKTSEGMENT

Specified by:

reduce in interface GenericReducer<Record,Record>

Specified by:

reduce in class ReduceFunction

Throws:

Exception

combine

public void combine(Iterator<Record> records,
           Collector<Record> out)
             throws Exception

Computes partial counts

Specified by:

combine in interface GenericReducer<Record,Record>

Overrides:

combine in class ReduceFunction

Throws:

Exception