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35 lines
1.3 KiB
35 lines
1.3 KiB
// Copyright (c) 2011-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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//
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// Merge operator that picks the maximum operand, Comparison is based on
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// Slice::compare
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#pragma once
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#include "rocksdb/merge_operator.h"
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namespace ROCKSDB_NAMESPACE {
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class Logger;
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class Slice;
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class MaxOperator : public MergeOperator {
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public:
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static const char* kClassName() { return "MaxOperator"; }
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static const char* kNickName() { return "max"; }
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const char* Name() const override { return kClassName(); }
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const char* NickName() const override { return kNickName(); }
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bool FullMergeV2(const MergeOperationInput& merge_in,
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MergeOperationOutput* merge_out) const override;
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bool PartialMerge(const Slice& /*key*/, const Slice& left_operand,
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const Slice& right_operand, std::string* new_value,
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Logger* /*logger*/) const override;
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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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};
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} // namespace ROCKSDB_NAMESPACE
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