Akanksha Mahajan 78afb4d81e Support SingleDelete for user-defined timestamps (#8921)
Summary:
Added support for SingleDelete for user-defined timestamps. Users can now Get and Iterate over keys deleted with SingleDelete. It also includes changes in CompactionIterator which  preserves the same user key with different timestamps, unless the timestamp is below a certain threshold full_history_ts_low.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/8921

Test Plan: Added new unit tests

Reviewed By: riversand963

Differential Revision: D31098191

Pulled By: akankshamahajan15

fbshipit-source-id: 78a59ef4b4884ae324fcd10f56e62a27d5ee2f49
2021-09-27 11:51:07 -07:00
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