97b30dee5b
Summary: `valueIndexMap_` in histogram is redundant and search in `valueIndexMap_` is slower than search in `bucketValues_`. this PR delete `valueIndexMap_` and search in `bucketValues_` by `std::lower_bound` Pull Request resolved: https://github.com/facebook/rocksdb/pull/8625 Reviewed By: zhichao-cao Differential Revision: D31613386 Pulled By: ajkr fbshipit-source-id: d7415d724f5c8f41f80cbe82afd7467cfad6f009