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由 Islam AbdelRahman 提交于
Summary: This diff update ForwardIterator to support pinning keys and values, which will allow DBIter to take advantage of that and eliminate memcpy when executing merge operators This diff is stacked on D61305 Test Plan: existing tests (updated them to test tailing iterator) new test Reviewers: andrewkr, yhchiang, sdong Reviewed By: sdong Subscribers: andrewkr, dhruba Differential Revision: https://reviews.facebook.net/D60009
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