1 | #pragma once |
---|---|
2 | |
3 | #include <ext/shared_ptr_helper.h> |
4 | #include <Formats/FormatSettings.h> |
5 | #include <Storages/IStorage.h> |
6 | #include <Storages/MergeTree/MergeTreeData.h> |
7 | |
8 | |
9 | namespace DB |
10 | { |
11 | |
12 | class Context; |
13 | |
14 | |
15 | /** Implements the system table `storage`, which allows you to get information about all disks. |
16 | */ |
17 | class StorageSystemStoragePolicies : public ext::shared_ptr_helper<StorageSystemStoragePolicies>, public IStorage |
18 | { |
19 | friend struct ext::shared_ptr_helper<StorageSystemStoragePolicies>; |
20 | public: |
21 | std::string getName() const override { return "SystemStoragePolicies"; } |
22 | std::string getTableName() const override { return name; } |
23 | std::string getDatabaseName() const override { return "system"; } |
24 | |
25 | BlockInputStreams read( |
26 | const Names & column_names, |
27 | const SelectQueryInfo & query_info, |
28 | const Context & context, |
29 | QueryProcessingStage::Enum processed_stage, |
30 | size_t max_block_size, |
31 | unsigned num_streams) override; |
32 | |
33 | private: |
34 | const std::string name; |
35 | |
36 | protected: |
37 | StorageSystemStoragePolicies(const std::string & name_); |
38 | }; |
39 | |
40 | } |
41 |