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4f9c0fd083
Summary: Add a merge operator that allows users to register specific aggregation function so that they can does aggregation based per key using different aggregation types. See comments of function CreateAggMergeOperator() for actual usage. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9780 Test Plan: Add a unit test to coverage various cases. Reviewed By: ltamasi Differential Revision: D35267444 fbshipit-source-id: 5b02f31c4f3e17e96dd4025cdc49fca8c2868628
48 lines
1.6 KiB
C++
48 lines
1.6 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 SumAggregator : public Aggregator {
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public:
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~SumAggregator() override {}
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bool Aggregate(const std::vector<Slice>&, std::string& result) const override;
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bool DoPartialAggregate() const override { return true; }
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};
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class MultipleAggregator : public Aggregator {
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public:
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~MultipleAggregator() override {}
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bool Aggregate(const std::vector<Slice>&, std::string& result) const override;
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bool DoPartialAggregate() const override { return true; }
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};
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class Last3Aggregator : public Aggregator {
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public:
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~Last3Aggregator() override {}
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bool Aggregate(const std::vector<Slice>&, std::string& result) const override;
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};
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class EncodeHelper {
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public:
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static std::string EncodeFuncAndInt(const Slice& function_name,
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int64_t value);
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static std::string EncodeInt(int64_t value);
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static std::string EncodeList(const std::vector<Slice>& list);
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static std::string EncodeFuncAndList(const Slice& function_name,
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const std::vector<Slice>& list);
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};
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} // namespace ROCKSDB_NAMESPACE
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