mirror of
https://github.com/facebook/rocksdb.git
synced 2024-12-02 10:15:54 +00:00
4e60663b31
Summary: In C++, `extern` is redundant in a number of cases: * "Global" function declarations and definitions * "Global" variable definitions when already declared `extern` For consistency and simplicity, I've removed these in code that *we own*. In a couple of cases, I removed obsolete declarations, and for MagicNumber constants, I have consolidated the declarations into a header file (format.h) as standard best practice would prescribe. Pull Request resolved: https://github.com/facebook/rocksdb/pull/12300 Test Plan: no functional changes, CI Reviewed By: ajkr Differential Revision: D53148629 Pulled By: pdillinger fbshipit-source-id: fb8d927959892e03af09b0c0d542b0a3b38fd886
50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
// 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 <algorithm>
|
|
#include <cstddef>
|
|
#include <memory>
|
|
#include <unordered_map>
|
|
|
|
#include "rocksdb/merge_operator.h"
|
|
#include "rocksdb/slice.h"
|
|
#include "rocksdb/utilities/agg_merge.h"
|
|
#include "utilities/cassandra/cassandra_options.h"
|
|
|
|
namespace ROCKSDB_NAMESPACE {
|
|
class AggMergeOperator : public MergeOperator {
|
|
public:
|
|
explicit AggMergeOperator();
|
|
|
|
bool FullMergeV2(const MergeOperationInput& merge_in,
|
|
MergeOperationOutput* merge_out) const override;
|
|
|
|
bool PartialMergeMulti(const Slice& key,
|
|
const std::deque<Slice>& operand_list,
|
|
std::string* new_value, Logger* logger) const override;
|
|
|
|
const char* Name() const override { return kClassName(); }
|
|
static const char* kClassName() { return "AggMergeOperator.v1"; }
|
|
|
|
bool AllowSingleOperand() const override { return true; }
|
|
|
|
bool ShouldMerge(const std::vector<Slice>&) const override { return false; }
|
|
|
|
private:
|
|
class Accumulator;
|
|
|
|
// Pack all merge operands into one value. This is called when aggregation
|
|
// fails. The existing values are preserved and returned so that users can
|
|
// debug the problem.
|
|
static void PackAllMergeOperands(const MergeOperationInput& merge_in,
|
|
MergeOperationOutput& merge_out);
|
|
static Accumulator& GetTLSAccumulator();
|
|
};
|
|
|
|
std::string EncodeAggFuncAndPayloadNoCheck(const Slice& function_name,
|
|
const Slice& value);
|
|
} // namespace ROCKSDB_NAMESPACE
|