Hi Martin, group sorting is currently only possible with field-index keys and not with KeySelectors. A workaround would be to use a map to convert your DataSet into Tuple3<YouPojoType, GroupType, SortType> and do a groupBy(1).sortGroup(2, Order:ASCENDING). This is actually also what the KeySelector would do under the hood.
Order.ANY gives the optimizer a bit more freedom to decide whether to sort ascending or descending. However, I guess this is only relevant in very few cases. Best, Fabian 2014-09-22 16:31 GMT+02:00 Martin Neumann <[email protected]>: > Hej, > > The data set I'm working on is quite large so I created a pojo class for it > to make it less messy. I want do do a simple map, group reduce job. But the > groups needs to be sorted on a secondary key. > > From what I understand I would get that by doing: > dataset.groupBy( key1 ).sortGroup( key2 , Order.ASCENDING ) > > Is that correct? > And if so how do I do the same call using a KeySelector. While groupBy can > take a KeySelector sortGroup cant. > > Also can someone explain to me what Order.ANY is about? > > > cheers Martin >
