[Minor] Fix stage partitioning algorithm

snuspl / nemo

Nemo: A flexible data processing system

https://snuspl.github.io/nemo/

Apache License 2.0

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Closed wonook closed 6 years ago

wonook commented 6 years ago

This PR:

Fixes the stage partitioning algorithm
- gets rid of the part that considers previous dependent stages and replaces it with stage boundaries with multiple inputs
A bit of refactoring in ScheduleGroupPass
Fix test to meet the new changes
Fix log messages to reduce the amount of verboseness.