8f2598ac9d
Summary: Updating Cassandra merge operator to make use of a single merge operand when needed. Single merge operand support has been introduced in #2721. Closes https://github.com/facebook/rocksdb/pull/2753 Differential Revision: D5652867 Pulled By: sagar0 fbshipit-source-id: b9fbd3196d3ebd0b752626dbf9bec9aa53e3e26a
34 lines
1.1 KiB
C++
34 lines
1.1 KiB
C++
// Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#pragma once
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/slice.h"
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namespace rocksdb {
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namespace cassandra {
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/**
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* A MergeOperator for rocksdb that implements Cassandra row value merge.
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*/
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class CassandraValueMergeOperator : public MergeOperator {
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public:
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static std::shared_ptr<MergeOperator> CreateSharedInstance();
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virtual bool FullMergeV2(const MergeOperationInput& merge_in,
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MergeOperationOutput* merge_out) const override;
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virtual bool PartialMergeMulti(const Slice& key,
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const std::deque<Slice>& operand_list,
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std::string* new_value,
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Logger* logger) const override;
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virtual const char* Name() const override;
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virtual bool AllowSingleOperand() const override { return true; }
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};
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} // namespace cassandra
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} // namespace rocksdb
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