ClickHouse/src/Storages/System/StorageSystemStoragePolicies.cpp

87 lines
3.1 KiB
C++
Raw Normal View History

#include <Columns/ColumnArray.h>
#include <DataStreams/OneBlockInputStream.h>
#include <Storages/System/StorageSystemStoragePolicies.h>
#include <DataTypes/DataTypeArray.h>
#include <Processors/Sources/SourceFromSingleChunk.h>
#include <Interpreters/Context.h>
namespace DB
{
namespace ErrorCodes
{
}
StorageSystemStoragePolicies::StorageSystemStoragePolicies(const std::string & name_)
2019-12-03 16:25:32 +00:00
: IStorage({"system", name_})
{
StorageInMemoryMetadata metadata_;
metadata_.setColumns(
2019-09-09 13:50:19 +00:00
ColumnsDescription({
{"policy_name", std::make_shared<DataTypeString>()},
{"volume_name", std::make_shared<DataTypeString>()},
{"volume_priority", std::make_shared<DataTypeUInt64>()},
{"disks", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
{"max_data_part_size", std::make_shared<DataTypeUInt64>()},
{"move_factor", std::make_shared<DataTypeFloat32>()}
}));
setInMemoryMetadata(metadata_);
}
Pipes StorageSystemStoragePolicies::read(
const Names & column_names,
const StorageMetadataPtr & metadata_snapshot,
const SelectQueryInfo & /*query_info*/,
const Context & context,
QueryProcessingStage::Enum /*processed_stage*/,
const size_t /*max_block_size*/,
const unsigned /*num_streams*/)
{
2020-06-17 14:32:25 +00:00
metadata_snapshot->check(column_names, getVirtuals());
2019-09-09 13:50:19 +00:00
MutableColumnPtr col_policy_name = ColumnString::create();
MutableColumnPtr col_volume_name = ColumnString::create();
MutableColumnPtr col_priority = ColumnUInt64::create();
MutableColumnPtr col_disks = ColumnArray::create(ColumnString::create());
MutableColumnPtr col_max_part_size = ColumnUInt64::create();
MutableColumnPtr col_move_factor = ColumnFloat32::create();
2020-05-22 10:09:24 +00:00
for (const auto & [policy_name, policy_ptr] : context.getPoliciesMap())
{
const auto & volumes = policy_ptr->getVolumes();
for (size_t i = 0; i != volumes.size(); ++i)
{
2019-09-09 13:50:19 +00:00
col_policy_name->insert(policy_name);
col_volume_name->insert(volumes[i]->getName());
col_priority->insert(i + 1);
Array disks;
disks.reserve(volumes[i]->getDisks().size());
for (const auto & disk_ptr : volumes[i]->getDisks())
disks.push_back(disk_ptr->getName());
2019-09-09 13:50:19 +00:00
col_disks->insert(disks);
col_max_part_size->insert(volumes[i]->max_data_part_size);
col_move_factor->insert(policy_ptr->getMoveFactor());
}
}
2020-01-24 18:33:47 +00:00
Columns res_columns;
res_columns.emplace_back(std::move(col_policy_name));
res_columns.emplace_back(std::move(col_volume_name));
res_columns.emplace_back(std::move(col_priority));
res_columns.emplace_back(std::move(col_disks));
res_columns.emplace_back(std::move(col_max_part_size));
res_columns.emplace_back(std::move(col_move_factor));
2020-01-24 18:33:47 +00:00
UInt64 num_rows = res_columns.at(0)->size();
Chunk chunk(std::move(res_columns), num_rows);
2019-09-09 13:50:19 +00:00
Pipes pipes;
pipes.emplace_back(std::make_shared<SourceFromSingleChunk>(metadata_snapshot->getSampleBlock(), std::move(chunk)));
return pipes;
}
}