9b3c9ef0e8
Summary: Some combinatino of --index_with_first_key and --index_shortening_mode can signifcantly improve performance for large values. Expose them in db_bench. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5859 Test Plan: Run them with the new options and observe the behavior. Differential Revision: D20104434 fbshipit-source-id: 21d48a732a9caf20b82312c7d7557d747ea3c304