/**
* Project "supplier".
*
* <p>Output Schema: Key: nationkey Value: suppkey
*/
@Override
public void map(Record record, Collector<Record> out) throws Exception {
suppKey = record.getField(0, suppKey);
inputTuple = record.getField(1, inputTuple);
/* Project (suppkey | name, address, nationkey, phone, acctbal, comment): */
IntValue nationKey = new IntValue(Integer.parseInt(inputTuple.getStringValueAt(3)));
record.setField(0, nationKey);
record.setField(1, suppKey);
out.collect(record);
}
@Override
public Record readRecord(Record target, byte[] record, int offset, int numBytes) {
String line = new String(record, offset, numBytes);
try {
this.key.setValue(Integer.parseInt(line.substring(0, line.indexOf("_"))));
this.value.setValue(Integer.parseInt(line.substring(line.indexOf("_") + 1, line.length())));
} catch (RuntimeException re) {
return null;
}
target.setField(0, this.key);
target.setField(1, this.value);
return target;
}
@Override
public void coGroup(
Iterator<Record> candidates, Iterator<Record> current, Collector<Record> out)
throws Exception {
if (!current.hasNext()) {
throw new Exception("Error: Id not encountered before.");
}
Record old = current.next();
long oldId = old.getField(1, LongValue.class).getValue();
long minimumComponentID = Long.MAX_VALUE;
while (candidates.hasNext()) {
long candidateComponentID = candidates.next().getField(1, LongValue.class).getValue();
if (candidateComponentID < minimumComponentID) {
minimumComponentID = candidateComponentID;
}
}
if (minimumComponentID < oldId) {
newComponentId.setValue(minimumComponentID);
old.setField(1, newComponentId);
out.collect(old);
}
}
