Andrey Zagrebin aeed4f0749 #3865 fix performance regression introduced by MergeOperator.ShouldMerge (#4266) ... Summary: This PR addresses issue #3865 and implements the following approach to fix it: - adds `MergeContext::GetOperandsDirectionForward` and `MergeContext::GetOperandsDirectionBackward` to query merge operands in a specific order - `MergeContext::GetOperands` becomes a shortcut for `MergeContext::GetOperandsDirectionForward` - pass `MergeContext::GetOperandsDirectionBackward` to `MergeOperator::ShouldMerge` and document the order Pull Request resolved: https://github.com/facebook/rocksdb/pull/4266 Differential Revision: D9360750 Pulled By: sagar0 fbshipit-source-id: 20cb73ff017760b062ecdcf4382560767086e092		2018-08-16 10:58:05 -07:00
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rocksdb	#3865 fix performance regression introduced by MergeOperator.ShouldMerge (#4266)	2018-08-16 10:58:05 -07:00