@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);
      }
    }
  }
Exemple #2
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  /**
   * 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);
  }