Examples of org.apache.flink.types.StringValue

org.apache.flink.types.StringValue
Mutable string data type that implements the Key interface. StringValue encapsulates the basic functionality of a {@link String}, in a serializable and mutable way.
The mutability allows to reuse the object inside the user code, also across invocations. Reusing a StringValue object helps to increase the performance, as string objects are rather heavy-weight objects and incur a lot of garbage collection overhead, if created and destroyed in masses. @see org.apache.flink.types.Key @see org.apache.flink.types.NormalizableKey @see java.lang.String @see java.lang.CharSequence

      format.setFieldTypesGeneric(StringValue.class, StringValue.class, StringValue.class);
      
      format.configure(parameters);
      format.open(split);
      
      Value[] values = new Value[] { new StringValue(), new StringValue(), new StringValue()};
      
      values = format.nextRecord(values);
      assertNotNull(values);
      assertEquals("abc", ((StringValue) values[0]).getValue());
      assertEquals("def", ((StringValue) values[1]).getValue());

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      format.setSkipFirstLineAsHeader(true);
      
      format.configure(parameters);
      format.open(split);
      
      Value[] values = new Value[] { new IntValue(), new StringValue(), new IntValue(), new StringValue()};
      
      // first line is skipped as header
      assertNotNull(format.nextRecord(values));   //  first row (= second line)
      assertNotNull(format.nextRecord(values));   // second row (= third line) 
      assertNull(format.nextRecord(values));  // exhausted

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      format.setSkipFirstLineAsHeader(true);
      
      format.configure(parameters);
      format.open(split);
      
      Value[] values = new Value[] { new IntValue(), new StringValue(), new IntValue(), new StringValue()};
      
      // first line is skipped as header
      assertNotNull(format.nextRecord(values));   //  first row (= second line)
      
      try {

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  @Before
  public void setup() {
    final ArrayList<IntStringPair> source = new ArrayList<IntStringPair>();
    
    // add elements to the source
    source.add(new IntStringPair(new IntValue(1), new StringValue("A")));
    source.add(new IntStringPair(new IntValue(2), new StringValue("B")));
    source.add(new IntStringPair(new IntValue(3), new StringValue("C")));
    source.add(new IntStringPair(new IntValue(3), new StringValue("D")));
    source.add(new IntStringPair(new IntValue(4), new StringValue("E")));
    source.add(new IntStringPair(new IntValue(4), new StringValue("F")));
    source.add(new IntStringPair(new IntValue(4), new StringValue("G")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("H")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("I")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("J")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("K")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("L")));
    
    
    this.sourceIter = new MutableObjectIterator<Record>() {
      final Iterator<IntStringPair> it = source.iterator();

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      Assert.assertTrue(hasIterator(this.psi.getValues()));
      Assert.assertFalse(hasIterator(this.psi.getValues()));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(1))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 1, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("A"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator must not have another value.", this.psi.getValues().hasNext());
      
      // Key 2, Value B
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue(hasIterator(this.psi.getValues()));
      Assert.assertFalse(hasIterator(this.psi.getValues()));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(2))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 2, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("B"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator must not have another value.", this.psi.getValues().hasNext());
      
      // Key 3, Values C, D
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue(hasIterator(this.psi.getValues()));
      Assert.assertFalse(hasIterator(this.psi.getValues()));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("C"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("D"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      try {
        this.psi.getValues().next();
        Assert.fail("A new KeyGroupedIterator must not have any value available and hence throw an exception on next().");
      }
      catch (NoSuchElementException nseex) {}
      Assert.assertFalse("KeyGroupedIterator must not have another value.", this.psi.getValues().hasNext());
      try {
        this.psi.getValues().next();
        Assert.fail("A new KeyGroupedIterator must not have any value available and hence throw an exception on next().");
      }
      catch (NoSuchElementException nseex) {}
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      
      // Key 4, Values E, F, G
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue(hasIterator(this.psi.getValues()));
      Assert.assertFalse(hasIterator(this.psi.getValues()));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("E"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("F"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("G"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertFalse("KeyGroupedIterator must not have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      
      // Key 5, Values H, I, J, K, L
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue(hasIterator(this.psi.getValues()));
      Assert.assertFalse(hasIterator(this.psi.getValues()));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("H"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("I"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("J"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("K"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("L"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      try {
        this.psi.getValues().next();
        Assert.fail("A new KeyGroupedIterator must not have any value available and hence throw an exception on next().");

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      Assert.assertTrue(hasIterator(this.psi.getValues()));
      Assert.assertFalse(hasIterator(this.psi.getValues()));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("C"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      
      // Progression first via next() only, then hasNext() only Key 4, Values E, F, G
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue(hasIterator(this.psi.getValues()));
      Assert.assertFalse(hasIterator(this.psi.getValues()));
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("E"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      
      // Key 5, Values H, I, J, K, L
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("H"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("I"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue(hasIterator(this.psi.getValues()));
      Assert.assertFalse(hasIterator(this.psi.getValues()));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      
      // end

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      valsIter = this.psi.getValues();
      Assert.assertNotNull("Returned Iterator must not be null", valsIter);
      Assert.assertTrue("KeyGroupedIterator's value iterator must have another value.", valsIter.hasNext());
      rec = valsIter.next();
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 1, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("A"), rec.getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator must have another value.", valsIter.hasNext());
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 1, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("A"), rec.getField(1, StringValue.class));      
      Assert.assertFalse("KeyGroupedIterator's value iterator must not have another value.", valsIter.hasNext());
      
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      valsIter = this.psi.getValues();
      Assert.assertNotNull("Returned Iterator must not be null", valsIter);
      Assert.assertTrue("KeyGroupedIterator's value iterator must have another value.", valsIter.hasNext());
      rec = valsIter.next();
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 2, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("B"), rec.getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator must have another value.", valsIter.hasNext());
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 2, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("B"), rec.getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator's value iterator must not have another value.", valsIter.hasNext());
      
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      valsIter = this.psi.getValues();
      Assert.assertNotNull("Returned Iterator must not be null", valsIter);
      Assert.assertTrue("KeyGroupedIterator's value iterator must have another value.", valsIter.hasNext());
      rec = valsIter.next();
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("C"), rec.getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator's value iterator must have another value.", valsIter.hasNext());
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("C"), rec.getField(1, StringValue.class));
      rec = valsIter.next();
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("D"), rec.getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator's value iterator must have another value.", valsIter.hasNext());
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("D"), rec.getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator's value iterator must have another value.", valsIter.hasNext());
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, rec.getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("D"), rec.getField(1, StringValue.class));
    } catch (Exception e) {
      e.printStackTrace();
      Assert.fail("The test encountered an unexpected exception.");
    }
  }

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        .lenient(true)
        .field(StringValue.class, 0)
        .field(IntValue.class, 1);
      
      Ordering ordering = new Ordering(0, StringValue.class, Order.DESCENDING);
      out.setGlobalOrder(ordering, new SimpleDistribution(new StringValue[] {new StringValue("N")}));
      
      Plan p = new Plan(out, "WordCount Example");
      p.setDefaultParallelism(DEFAULT_PARALLELISM);
  
      OptimizedPlan plan;

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  public void setup()
  {
    final ArrayList<IntStringPair> source = new ArrayList<IntStringPair>();
    
    // add elements to the source
    source.add(new IntStringPair(new IntValue(1), new StringValue("A")));
    source.add(new IntStringPair(new IntValue(2), new StringValue("B")));
    source.add(new IntStringPair(new IntValue(3), new StringValue("C")));
    source.add(new IntStringPair(new IntValue(3), new StringValue("D")));
    source.add(new IntStringPair(new IntValue(4), new StringValue("E")));
    source.add(new IntStringPair(new IntValue(4), new StringValue("F")));
    source.add(new IntStringPair(new IntValue(4), new StringValue("G")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("H")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("I")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("J")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("K")));
    source.add(new IntStringPair(new IntValue(5), new StringValue("L")));
    
    
    this.sourceIter = new MutableObjectIterator<Record>() {
      final Iterator<IntStringPair> it = source.iterator();

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      // Key 1, Value A
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(1))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 1, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("A"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator must not have another value.", this.psi.getValues().hasNext());
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 1, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      
      // Key 2, Value B
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(2))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 2, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("B"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertFalse("KeyGroupedIterator must not have another value.", this.psi.getValues().hasNext());
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 2, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      
      // Key 3, Values C, D
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("C"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("D"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      try {
        this.psi.getValues().next();
        Assert.fail("A new KeyGroupedIterator must not have any value available and hence throw an exception on next().");
      }
      catch (NoSuchElementException nseex) {}
      Assert.assertFalse("KeyGroupedIterator must not have another value.", this.psi.getValues().hasNext());
      try {
        this.psi.getValues().next();
        Assert.fail("A new KeyGroupedIterator must not have any value available and hence throw an exception on next().");
      }
      catch (NoSuchElementException nseex) {}
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(3))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 3, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      
      // Key 4, Values E, F, G
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("E"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("F"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("G"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertFalse("KeyGroupedIterator must not have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(4))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 4, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      
      // Key 5, Values H, I, J, K, L
      Assert.assertTrue("KeyGroupedIterator must have another key.", this.psi.nextKey());
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("H"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("I"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("J"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("K"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator must have another value.", this.psi.getValues().hasNext());
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      Assert.assertEquals("KeyGroupedIterator returned a wrong value.", new StringValue("L"), this.psi.getValues().next().getField(1, StringValue.class));
      Assert.assertTrue("KeyGroupedIterator returned a wrong key.", this.psi.getComparatorWithCurrentReference().equalToReference(new Record(new IntValue(5))));
      Assert.assertEquals("KeyGroupedIterator returned a wrong key.", 5, this.psi.getCurrent().getField(0, IntValue.class).getValue());
      try {
        this.psi.getValues().next();
        Assert.fail("A new KeyGroupedIterator must not have any value available and hence throw an exception on next().");

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