DeleteRange Get support
Summary: During Get()/MultiGet(), build up a RangeDelAggregator with range tombstones as we search through live memtable, immutable memtables, and SST files. This aggregator is then used by memtable.cc's SaveValue() and GetContext::SaveValue() to check whether keys are covered. added tests for Get on memtables/files; end-to-end tests mainly in https://reviews.facebook.net/D64761 Closes https://github.com/facebook/rocksdb/pull/1456 Differential Revision: D4111271 Pulled By: ajkr fbshipit-source-id: 6e388d4
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