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

Yi Wu 8c392a31d7 WritePrepared Txn: Iterator ... Summary: On iterator create, take a snapshot, create a ReadCallback and pass the ReadCallback to the underlying DBIter to check if key is committed. Closes https://github.com/facebook/rocksdb/pull/2981 Differential Revision: D6001471 Pulled By: yiwu-arbug fbshipit-source-id: 3565c4cdaf25370ba47008b0e0cb65b31dfe79fe		8 years ago
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date_tiered_db_impl.cc	WritePrepared Txn: Iterator	8 years ago
date_tiered_db_impl.h	Make InternalKeyComparator final and directly use it in merging iterator	8 years ago
date_tiered_test.cc	Fix GetCurrentTime() initialization for valgrind	8 years ago