Yanqin Jin 59530e3282 Fix timestamp support for MultiGet (#6748)
Summary:
1. Avoid nullptr dereference when passing timestamp to KeyContext creation.
2. Construct LookupKey correctly with timestamp when creating MultiGetContext.
3. Compare without timestamp when sorting KeyContexts.

Fixes https://github.com/facebook/rocksdb/issues/6745

Test plan (dev server):
make check
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6748

Reviewed By: pdillinger

Differential Revision: D21258691

Pulled By: riversand963

fbshipit-source-id: 44e65b759c18b9986947783edf03be4f890bb004
2020-04-28 14:26:34 -07:00
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