stratosphere/stratosphere — pull request #635 by aljoscha (2014-03-27 12:41:48+00:00)
Title: Add PojoTypeInformation, PojoComparator and Expressions for Keys

This enables code like:
```java
class WC {
public String word;
public int count;
}
...
DataSet result = tokenized
.groupBy("word")
.reduce(new ReduceFunction() {
public WC reduce(WC value1, WC value2) {
return new WC(value1.word, value1.count + value2.count);
}
});
```