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85 lines
3.0 KiB
C++
85 lines
3.0 KiB
C++
#include <Columns/ColumnArray.h>
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#include <DataStreams/OneBlockInputStream.h>
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#include <Storages/System/StorageSystemStoragePolicies.h>
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#include <DataTypes/DataTypeArray.h>
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#include <Processors/Sources/SourceFromSingleChunk.h>
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namespace DB
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{
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namespace ErrorCodes
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{
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}
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StorageSystemStoragePolicies::StorageSystemStoragePolicies(const std::string & name_)
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: IStorage({"system", name_})
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{
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setColumns(
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ColumnsDescription({
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{"policy_name", std::make_shared<DataTypeString>()},
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{"volume_name", std::make_shared<DataTypeString>()},
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{"volume_priority", std::make_shared<DataTypeUInt64>()},
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{"disks", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
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{"max_data_part_size", std::make_shared<DataTypeUInt64>()},
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{"move_factor", std::make_shared<DataTypeFloat32>()}
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}));
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}
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Pipes StorageSystemStoragePolicies::read(
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const Names & column_names,
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const SelectQueryInfo & /*query_info*/,
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const Context & context,
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QueryProcessingStage::Enum /*processed_stage*/,
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const size_t /*max_block_size*/,
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const unsigned /*num_streams*/)
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{
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check(column_names);
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MutableColumnPtr col_policy_name = ColumnString::create();
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MutableColumnPtr col_volume_name = ColumnString::create();
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MutableColumnPtr col_priority = ColumnUInt64::create();
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MutableColumnPtr col_disks = ColumnArray::create(ColumnString::create());
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MutableColumnPtr col_max_part_size = ColumnUInt64::create();
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MutableColumnPtr col_move_factor = ColumnFloat32::create();
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const auto & policy_selector = context.getStoragePolicySelector();
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for (const auto & [policy_name, policy_ptr] : policy_selector->getPoliciesMap())
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{
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const auto & volumes = policy_ptr->getVolumes();
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for (size_t i = 0; i != volumes.size(); ++i)
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{
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col_policy_name->insert(policy_name);
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col_volume_name->insert(volumes[i]->getName());
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col_priority->insert(i + 1);
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Array disks;
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disks.reserve(volumes[i]->getDisks().size());
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for (const auto & disk_ptr : volumes[i]->getDisks())
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disks.push_back(disk_ptr->getName());
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col_disks->insert(disks);
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col_max_part_size->insert(volumes[i]->max_data_part_size);
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col_move_factor->insert(policy_ptr->getMoveFactor());
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}
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}
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Columns res_columns;
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res_columns.emplace_back(std::move(col_policy_name));
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res_columns.emplace_back(std::move(col_volume_name));
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res_columns.emplace_back(std::move(col_priority));
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res_columns.emplace_back(std::move(col_disks));
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res_columns.emplace_back(std::move(col_max_part_size));
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res_columns.emplace_back(std::move(col_move_factor));
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UInt64 num_rows = res_columns.at(0)->size();
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Chunk chunk(std::move(res_columns), num_rows);
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Pipes pipes;
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pipes.emplace_back(std::make_shared<SourceFromSingleChunk>(getSampleBlock(), std::move(chunk)));
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return pipes;
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}
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}
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