apache/incubator-flink — pull request #58 by tobwiens (2014-07-06 14:00:22+00:00)
Title: [FLINK-925] Support KeySelector function returning Tuples

Tuple types can be returned by the KeySelector. Enabling tuple types to be used as KEYs for grouping.

Added test cases using TupleComparatorTestBase. Testing Tuple3.