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Support ingest file when range deletions exist
Summary: Previously we returned NotSupported when ingesting files into a database containing any range deletions. This diff adds the support. - Flush if any memtable contains range deletions overlapping the to-be-ingested file - Place to-be-ingested file before any level that contains range deletions overlapping it. - Added support for `Version` to return iterators over range deletions in a given level. Previously, we piggybacked getting range deletions onto `Version`'s `Get()` / `AddIterator()` functions by passing them a `RangeDelAggregator*`. But file ingestion needs to get iterators over range deletions, not populate an aggregator (since the aggregator does collapsing and doesn't expose the actual ranges). Closes facebook#2370 Differential Revision: D5127648 Pulled By: ajkr fbshipit-source-id: 816faeb9708adfa5287962bafdde717db56e3f1a
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