/** Unit test for Tuple.resetTupleDesc() */
@Test
public void resetTupleDesc() {
// create a tuple with the original tuple desc
TupleDesc origTd = Utility.getTupleDesc(2, "orig");
Tuple tup = new Tuple(origTd);
assertEquals("orig0", tup.getTupleDesc().getFieldName(0));
// rename the fields by changing the tuple desc to a new one
TupleDesc newTd = Utility.getTupleDesc(2, "new");
tup.resetTupleDesc(newTd);
assertEquals("new0", tup.getTupleDesc().getFieldName(0));
}
/**
* Merge a new tuple into the aggregate, grouping as indicated in the constructor
*
* @param tup the Tuple containing an aggregate field and a group-by field
*/
public void mergeTupleIntoGroup(Tuple tup) {
if (this.groupByFieldName == null && this.groupByField != NO_GROUPING) {
this.groupByFieldName = tup.getTupleDesc().getFieldName(this.groupByField);
}
Field key;
if (this.groupByField != NO_GROUPING) {
key = tup.getField(this.groupByField);
} else {
key = new IntField(-1);
}
// TODO: clean up average logic
int aggregationValue = ((IntField) tup.getField(this.aggregateField)).getValue();
if (this.groups.containsKey(key)) {
this.groups.put(key, this.performOperation(key, this.groups.get(key), aggregationValue));
if (this.op == Op.AVG) {
this.counts.put(key, this.counts.get(key) + 1);
}
} else {
this.groups.put(key, this.initValue(aggregationValue));
if (this.op == Op.AVG) {
this.counts.put(key, 1);
}
}
}
/**
* Adds the specified tuple to the page; the tuple should be updated to reflect that it is now
* stored on this page.
*
* @throws DbException if the page is full (no empty slots) or tupledesc is mismatch.
* @param t The tuple to add.
*/
public void insertTuple(Tuple t) throws DbException {
// some code goes here
// not necessary for lab1
RecordId targetrid = t.getRecordId();
if (getNumEmptySlots() == 0 || !td.equals(t.getTupleDesc())) {
throw new DbException("Either page is full or tuple desc doesn't match");
}
for (int i = 0; i < getNumTuples(); i++) {
if (!isSlotUsed(i)) {
markSlotUsed(i, true);
RecordId rid = new RecordId(pid, i);
t.setRecordId(rid);
tuples[i] = t;
return;
}
}
}
/** Unit test for Tuple.getTupleDesc() */
@Test
public void getTupleDesc() {
TupleDesc td = Utility.getTupleDesc(5);
Tuple tup = new Tuple(td);
assertEquals(td, tup.getTupleDesc());
}