|
|
|
|
// Copyright (c) 2017-present, Facebook, Inc. All rights reserved.
|
|
|
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
|
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
|
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
|
|
|
|
|
|
|
|
#pragma once
|
|
|
|
|
#include "rocksdb/merge_operator.h"
|
|
|
|
|
#include "rocksdb/slice.h"
|
|
|
|
|
|
|
|
|
|
namespace rocksdb {
|
|
|
|
|
namespace cassandra {
|
|
|
|
|
|
|
|
|
|
/**
|
|
|
|
|
* A MergeOperator for rocksdb that implements Cassandra row value merge.
|
|
|
|
|
*/
|
|
|
|
|
class CassandraValueMergeOperator : public MergeOperator {
|
|
|
|
|
public:
|
|
|
|
|
static std::shared_ptr<MergeOperator> CreateSharedInstance();
|
|
|
|
|
|
|
|
|
|
virtual bool FullMergeV2(const MergeOperationInput& merge_in,
|
|
|
|
|
MergeOperationOutput* merge_out) const override;
|
|
|
|
|
|
|
|
|
|
virtual bool PartialMerge(const Slice& key,
|
|
|
|
|
const Slice& left_operand,
|
|
|
|
|
const Slice& right_operand,
|
|
|
|
|
std::string* new_value,
|
|
|
|
|
Logger* logger) const override;
|
|
|
|
|
|
|
|
|
|
virtual bool PartialMergeMulti(const Slice& key,
|
|
|
|
|
const std::deque<Slice>& operand_list,
|
|
|
|
|
std::string* new_value,
|
|
|
|
|
Logger* logger) const override;
|
|
|
|
|
|
|
|
|
|
virtual const char* Name() const override;
|
|
|
|
|
};
|
|
|
|
|
} // namespace cassandra
|
|
|
|
|
} // namespace rocksdb
|
