fork of https://github.com/oxigraph/rocksdb and https://github.com/facebook/rocksdb for nextgraph and oxigraph

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		9 years ago
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write_batch_with_index.cc	Add SeekForPrev() to Iterator	9 years ago
write_batch_with_index_internal.cc	WriteBatch support for range deletion	9 years ago
write_batch_with_index_internal.h	Modification of WriteBatch to support two phase commit	9 years ago
write_batch_with_index_test.cc	Add SeekForPrev() to Iterator	9 years ago