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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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hash_cuckoo_rep.cc Add SeekForPrev() to Iterator 2016-09-27 18:20:57 -07:00
hash_cuckoo_rep.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
hash_linklist_rep.cc Add SeekForPrev() to Iterator 2016-09-27 18:20:57 -07:00
hash_linklist_rep.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
hash_skiplist_rep.cc Add SeekForPrev() to Iterator 2016-09-27 18:20:57 -07:00
hash_skiplist_rep.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
skiplistrep.cc Add SeekForPrev() to Iterator 2016-09-27 18:20:57 -07:00
stl_wrappers.h Updated all copyright headers to the new format. 2016-02-09 15:12:00 -08:00
vectorrep.cc Add SeekForPrev() to Iterator 2016-09-27 18:20:57 -07:00