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

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Yu Zhang 16bdb1f999 Add timestamp support to DBImplReadOnly (#10004) ... Summary: This PR adds timestamp support to a read only DB instance opened as `DBImplReadOnly`. A follow up PR will add the same support to `CompactedDBImpl`. With this, read only database has these timestamp related APIs: `ReadOptions.timestamp` : read should return the latest data visible to this specified timestamp `Iterator::timestamp()` : returns the timestamp associated with the key, value `DB:Get(..., std::string* timestamp)` : returns the timestamp associated with the key, value in `timestamp` Test plan (on devserver): ``` $COMPILE_WITH_ASAN=1 make -j24 all $./db_with_timestamp_basic_test --gtest_filter=DBBasicTestWithTimestamp.ReadOnlyDB* ``` Pull Request resolved: https://github.com/facebook/rocksdb/pull/10004 Reviewed By: riversand963 Differential Revision: D36434422 Pulled By: jowlyzhang fbshipit-source-id: 5d949e65b1ffb845758000e2b310fdd4aae71cfb		2 years ago
..
compacted_db_impl.cc	Fix a timer crash caused by invalid memory management (#9656)	2 years ago
compacted_db_impl.h	Move compacted_db_impl.[c|h] to db/db_impl (#8082)	3 years ago
db_impl.cc	Add timestamp support to DBImplReadOnly (#10004)	2 years ago
db_impl.h	Add timestamp support to DBImplReadOnly (#10004)	2 years ago
db_impl_compaction_flush.cc	Track SST unique id in MANIFEST and verify (#9990)	2 years ago
db_impl_debug.cc	Use std::numeric_limits<> (#9954)	2 years ago
db_impl_experimental.cc	Track SST unique id in MANIFEST and verify (#9990)	2 years ago
db_impl_files.cc	Use std::numeric_limits<> (#9954)	2 years ago
db_impl_open.cc	Track SST unique id in MANIFEST and verify (#9990)	2 years ago
db_impl_readonly.cc	Add timestamp support to DBImplReadOnly (#10004)	2 years ago
db_impl_readonly.h	Add timestamp support to DBImplReadOnly (#10004)	2 years ago
db_impl_secondary.cc	Track SST unique id in MANIFEST and verify (#9990)	2 years ago
db_impl_secondary.h	Revert open logic changes in #9634 (#9906)	2 years ago
db_impl_write.cc	Do not release and re-acquire dbmutex on memtable-switch if no listener (#9758)	2 years ago