mirror of https://github.com/facebook/rocksdb.git
50 lines
1.8 KiB
C++
50 lines
1.8 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 <algorithm>
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#include <cstddef>
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#include <memory>
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#include <unordered_map>
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#include "rocksdb/merge_operator.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/utilities/agg_merge.h"
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#include "utilities/cassandra/cassandra_options.h"
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namespace ROCKSDB_NAMESPACE {
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class AggMergeOperator : public MergeOperator {
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public:
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explicit AggMergeOperator();
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bool FullMergeV2(const MergeOperationInput& merge_in,
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MergeOperationOutput* merge_out) 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, Logger* logger) const override;
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const char* Name() const override { return kClassName(); }
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static const char* kClassName() { return "AggMergeOperator.v1"; }
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bool AllowSingleOperand() const override { return true; }
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bool ShouldMerge(const std::vector<Slice>&) const override { return false; }
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private:
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class Accumulator;
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// Pack all merge operands into one value. This is called when aggregation
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// fails. The existing values are preserved and returned so that users can
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// debug the problem.
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static void PackAllMergeOperands(const MergeOperationInput& merge_in,
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MergeOperationOutput& merge_out);
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static Accumulator& GetTLSAccumulator();
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};
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extern std::string EncodeAggFuncAndPayloadNoCheck(const Slice& function_name,
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const Slice& value);
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} // namespace ROCKSDB_NAMESPACE
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