132306fbf0
Summary: `PartialMergeMulti` implementation is enough for Cassandra, and `PartialMerge` is not required. Implementing both will just duplicate the code. As per https://github.com/facebook/rocksdb/blob/master/include/rocksdb/merge_operator.h#L130-L135 : ``` // The default implementation of PartialMergeMulti will use this function // as a helper, for backward compatibility. Any successor class of // MergeOperator should either implement PartialMerge or PartialMergeMulti, // although implementing PartialMergeMulti is suggested as it is in general // more effective to merge multiple operands at a time instead of two // operands at a time. ``` Closes https://github.com/facebook/rocksdb/pull/2737 Reviewed By: scv119 Differential Revision: D5633073 Pulled By: sagar0 fbshipit-source-id: ef4fa102c22fec6a0175ed12f5c44c15afe3c8ca