TransactionUtil::CheckKey() to skip unnecessary history (#4941)
Summary: If a memtable definitely covers a key, there isn't a need to check older memtables. We can skip them by checking the earliest sequence number. Pull Request resolved: https://github.com/facebook/rocksdb/pull/4941 Differential Revision: D13932666 fbshipit-source-id: b9d52f234b8ad9dd3bf6547645cd457175a3ca9b
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