@Test
public void new_iteratorTest() {
int[] lengths = new int[] {1, 2, 1000};
for (int len : lengths) {
TupleDesc td = Utility.getTupleDesc(len);
Iterator<TupleDesc.TDItem> i = td.iterator();
while (i.hasNext()) {
TupleDesc.TDItem item = i.next();
assertEquals(Type.INT_TYPE, item.fieldType);
assertEquals("", item.fieldName);
}
}
}
/**
* Returns the TupleDesc with field names from the underlying HeapFile, prefixed with the
* tableAlias string from the constructor. This prefix becomes useful when joining tables
* containing a field(s) with the same name.
*
* @return the TupleDesc with field names from the underlying HeapFile, prefixed with the
* tableAlias string from the constructor.
*/
public TupleDesc getTupleDesc() {
// some code goes here
TupleDesc td = Database.getCatalog().getTupleDesc(tableid);
Iterator<TDItem> tdIter = td.iterator();
int size = td.numFields();
Type[] typeAr = new Type[size];
String[] fieldAr = new String[size];
String aliasString = this.tableAlias;
TDItem item;
Type fieldType;
String fieldName;
int count = 0;
if (aliasString == null) {
aliasString = "null";
}
// for (int i = 0; i < size; i++){
// item = tdIter.next();
// fieldType = item.fieldType;
// fieldName = item.fieldName;
while (tdIter.hasNext()) {
item = tdIter.next();
fieldType = item.fieldType;
fieldName = item.fieldName;
if (fieldName == null) {
fieldName = "null";
}
typeAr[count] = fieldType;
fieldAr[count] = aliasString + "." + fieldName; // "null.null case may occur"
count++;
}
return new TupleDesc(typeAr, fieldAr);
}