This patchset applies the following changes: using vertical compaction machanism to do segcompaction basic (WIP) refraction to separate segcompaction logic from BetaRowsetWriter add segcompaction specific ut and regression tests
This patchset applies the following changes: using vertical compaction machanism to do segcompaction basic (WIP) refraction to separate segcompaction logic from BetaRowsetWriter add segcompaction specific ut and regression tests