spark git commit: [SPARK-22361][SQL][TEST] Add unit test for Window Frames

Repository: spark Updated Branches: refs/heads/branch-2.3 41d1a323c -> 08252bb38 [SPARK-22361][SQL][TEST] Add unit test for Window Frames ## What changes were proposed in this pull request? There are already quite a few integration tests using window frames, but the unit tests coverage is no

spark git commit: [SPARK-22361][SQL][TEST] Add unit test for Window Frames

Repository: spark Updated Branches: refs/heads/master 0c2ba427b -> a9b845ebb [SPARK-22361][SQL][TEST] Add unit test for Window Frames ## What changes were proposed in this pull request? There are already quite a few integration tests using window frames, but the unit tests coverage is not id