// from Operator
@Override
public List<String> process(List<String> tuple) {
_numTuplesProcessed++;
if (_distinct != null) {
tuple = _distinct.process(tuple);
if (tuple == null) {
return null;
}
}
String tupleHash;
if (_groupByType == GB_PROJECTION) {
tupleHash =
MyUtilities.createHashString(
tuple, _groupByColumns, _groupByProjection.getExpressions(), _map);
} else {
tupleHash = MyUtilities.createHashString(tuple, _groupByColumns, _map);
}
T value = _storage.update(tuple, tupleHash);
String strValue = _wrapper.toString(value);
// propagate further the affected tupleHash-tupleValue pair
List<String> affectedTuple = new ArrayList<String>();
affectedTuple.add(tupleHash);
affectedTuple.add(strValue);
return affectedTuple;
}
@Override
public String evalString(List<String> tuple) {
T result = eval(tuple);
return _wrapper.toString(result);
}