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

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Yanqin Jin 961c7590d6 Add timestamp to delete (#6253) ... Summary: Preliminary user-timestamp support for delete. If ["a", ts=100] exists, you can delete it by calling `DB::Delete(write_options, key)` in which `write_options.timestamp` points to a `ts` higher than 100. Implementation A new ValueType, i.e. `kTypeDeletionWithTimestamp` is added for deletion marker with timestamp. The reason for a separate `kTypeDeletionWithTimestamp`: RocksDB may drop tombstones (keys with kTypeDeletion) when compacting them to the bottom level. This is OK and useful if timestamp is disabled. When timestamp is enabled, should we still reuse `kTypeDeletion`, we may drop the tombstone with a more recent timestamp, causing deleted keys to re-appear. Test plan (dev server) ``` make check ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/6253 Reviewed By: ltamasi Differential Revision: D20995328 Pulled By: riversand963 fbshipit-source-id: a9e5c22968ad76f98e3dc6ee0151265a3f0df619		4 years ago
..
db_impl.cc	Allow MultiGet users to limit cumulative value size (#6826)	4 years ago
db_impl.h	Find/purge obsolete blob files (#6807)	4 years ago
db_impl_compaction_flush.cc	Fix db_stress when GetLiveFiles() flushes dropped CF (#6805)	4 years ago
db_impl_debug.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
db_impl_experimental.cc	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
db_impl_files.cc	Fix a few bugs in best-efforts recovery (#6824)	4 years ago
db_impl_open.cc	Fix a few bugs in best-efforts recovery (#6824)	4 years ago
db_impl_readonly.cc	Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621)	4 years ago
db_impl_readonly.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
db_impl_secondary.cc	Properly report IO errors when IndexType::kBinarySearchWithFirstKey is used (#6621)	4 years ago
db_impl_secondary.h	Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433)	5 years ago
db_impl_write.cc	Add timestamp to delete (#6253)	4 years ago
db_secondary_test.cc	Do not swallow error returned from SaveTo() (#6801)	4 years ago