/** Unit test for TupleDesc.combine() */
@Test
public void combine() {
TupleDesc td1, td2, td3;
td1 = Utility.getTupleDesc(1, "td1");
td2 = Utility.getTupleDesc(2, "td2");
// test td1.combine(td2)
td3 = TupleDesc.merge(td1, td2);
assertEquals(3, td3.numFields());
assertEquals(3 * Type.INT_TYPE.getLen(), td3.getSize());
for (int i = 0; i < 3; ++i) assertEquals(Type.INT_TYPE, td3.getFieldType(i));
assertEquals(combinedStringArrays(td1, td2, td3), true);
// test td2.combine(td1)
td3 = TupleDesc.merge(td2, td1);
assertEquals(3, td3.numFields());
assertEquals(3 * Type.INT_TYPE.getLen(), td3.getSize());
for (int i = 0; i < 3; ++i) assertEquals(Type.INT_TYPE, td3.getFieldType(i));
assertEquals(combinedStringArrays(td2, td1, td3), true);
// test td2.combine(td2)
td3 = TupleDesc.merge(td2, td2);
assertEquals(4, td3.numFields());
assertEquals(4 * Type.INT_TYPE.getLen(), td3.getSize());
for (int i = 0; i < 4; ++i) assertEquals(Type.INT_TYPE, td3.getFieldType(i));
assertEquals(combinedStringArrays(td2, td2, td3), true);
}
/** Unit test for TupleDesc.numFields() */
@Test
public void numFields() {
int[] lengths = new int[] {1, 2, 1000};
for (int len : lengths) {
TupleDesc td = Utility.getTupleDesc(len);
assertEquals(len, td.numFields());
}
}
/** Ensures that combined's field names = td1's field names + td2's field names */
private boolean combinedStringArrays(TupleDesc td1, TupleDesc td2, TupleDesc combined) {
for (int i = 0; i < td1.numFields(); i++) {
if (!(((td1.getFieldName(i) == null) && (combined.getFieldName(i) == null))
|| td1.getFieldName(i).equals(combined.getFieldName(i)))) {
return false;
}
}
for (int i = td1.numFields(); i < td1.numFields() + td2.numFields(); i++) {
if (!(((td2.getFieldName(i - td1.numFields()) == null) && (combined.getFieldName(i) == null))
|| td2.getFieldName(i - td1.numFields()).equals(combined.getFieldName(i)))) {
return false;
}
}
return true;
}