// 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 toString() {
StringBuilder sb = new StringBuilder();
sb.append("AggregateSumOperator with VE: ");
sb.append(_ve.toString());
if (_groupByColumns.isEmpty() && _groupByProjection == null) {
sb.append("\n No groupBy!");
} else if (!_groupByColumns.isEmpty()) {
sb.append("\n GroupByColumns are ").append(getGroupByStr()).append(".");
} else if (_groupByProjection != null) {
sb.append("\n GroupByProjection is ").append(_groupByProjection.toString()).append(".");
}
if (_distinct != null) {
sb.append("\n It also has distinct ").append(_distinct.toString());
}
return sb.toString();
}