/***********************************************************************************************************************
* Copyright (C) 2010-2013 by the Stratosphere project (http://stratosphere.eu)
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
* an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
* specific language governing permissions and limitations under the License.
**********************************************************************************************************************/
package eu.stratosphere.test.recordJobs.relational.query1Util;
import java.util.Iterator;
import eu.stratosphere.api.java.record.functions.ReduceFunction;
import eu.stratosphere.test.recordJobs.util.Tuple;
import eu.stratosphere.types.LongValue;
import eu.stratosphere.types.Record;
import eu.stratosphere.types.StringValue;
import eu.stratosphere.util.Collector;
public class GroupByReturnFlag extends ReduceFunction {
private static final long serialVersionUID = 1L;
@Override
public void reduce(Iterator<Record> records, Collector<Record> out) throws Exception {
Record outRecord = new Record();
Tuple returnTuple = new Tuple();
long quantity = 0;
double extendedPriceSum = 0.0;
boolean first = true;
while(records.hasNext()) {
Record rec = records.next();
Tuple t = rec.getField(1, Tuple.class);
if(first) {
first = false;
rec.copyTo(outRecord);
returnTuple.addAttribute(rec.getField(0, StringValue.class).toString());
}
long tupleQuantity = Long.parseLong(t.getStringValueAt(4));
quantity += tupleQuantity;
double extendedPricePerTuple = Double.parseDouble(t.getStringValueAt(5));
extendedPriceSum += extendedPricePerTuple;
}
LongValue pactQuantity = new LongValue(quantity);
returnTuple.addAttribute("" + pactQuantity);
returnTuple.addAttribute("" + extendedPriceSum);
outRecord.setField(1, returnTuple);
out.collect(outRecord);
}
}