Sagar Vemuri 9a44b4c32c Allow merge operator to be called even with a single operand ... Summary: Added a function `MergeOperator::DoesAllowSingleMergeOperand()` to allow invoking a merge operator even with a single merge operand, if overriden. This is needed for Cassandra-on-RocksDB work. All Cassandra writes are through merges and this will allow a single merge-value to be updated in the merge-operator invoked via a compaction, if needed, due to an expired TTL. Closes https://github.com/facebook/rocksdb/pull/2721 Differential Revision: D5608706 Pulled By: sagar0 fbshipit-source-id: f299f9f91c4d1ac26e48bd5906e122c1c5e5f3fc		2017-08-16 23:42:00 -07:00
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rocksdb	Allow merge operator to be called even with a single operand	2017-08-16 23:42:00 -07:00