Aaron Gao f517d9dd09 Add SeekForPrev() to Iterator ... Summary: Add new Iterator API, `SeekForPrev`: find the last key that <= target key support prefix_extractor support prefix_same_as_start support upper_bound not supported in iterators without Prev() Also add tests in db_iter_test and db_iterator_test Pass all tests Cheers! Test Plan: make all check -j64 Reviewers: andrewkr, yiwu, IslamAbdelRahman, sdong Reviewed By: sdong Subscribers: andrewkr, dhruba, leveldb Differential Revision: https://reviews.facebook.net/D64149		2016-09-27 18:20:57 -07:00
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rocksdb	Add SeekForPrev() to Iterator	2016-09-27 18:20:57 -07:00