ClickHouse/dbms/src/Storages/System/StorageSystemParts.cpp
Amos Bird 9fa955403b Optimize count()
Choose the smallest column to count if possible.
2019-07-17 02:29:17 +08:00

131 lines
6.5 KiB
C++

#include "StorageSystemParts.h"
#include <Common/escapeForFileName.h>
#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataTypes/DataTypeDateTime.h>
#include <DataTypes/DataTypeDate.h>
#include <DataStreams/OneBlockInputStream.h>
#include <Storages/VirtualColumnUtils.h>
#include <Databases/IDatabase.h>
#include <Common/hex.h>
namespace DB
{
StorageSystemParts::StorageSystemParts(const std::string & name)
: StorageSystemPartsBase(name,
{
{"partition", std::make_shared<DataTypeString>()},
{"name", std::make_shared<DataTypeString>()},
{"active", std::make_shared<DataTypeUInt8>()},
{"marks", std::make_shared<DataTypeUInt64>()},
{"rows", std::make_shared<DataTypeUInt64>()},
{"bytes_on_disk", std::make_shared<DataTypeUInt64>()},
{"data_compressed_bytes", std::make_shared<DataTypeUInt64>()},
{"data_uncompressed_bytes", std::make_shared<DataTypeUInt64>()},
{"marks_bytes", std::make_shared<DataTypeUInt64>()},
{"modification_time", std::make_shared<DataTypeDateTime>()},
{"remove_time", std::make_shared<DataTypeDateTime>()},
{"refcount", std::make_shared<DataTypeUInt32>()},
{"min_date", std::make_shared<DataTypeDate>()},
{"max_date", std::make_shared<DataTypeDate>()},
{"min_time", std::make_shared<DataTypeDateTime>()},
{"max_time", std::make_shared<DataTypeDateTime>()},
{"partition_id", std::make_shared<DataTypeString>()},
{"min_block_number", std::make_shared<DataTypeInt64>()},
{"max_block_number", std::make_shared<DataTypeInt64>()},
{"level", std::make_shared<DataTypeUInt32>()},
{"data_version", std::make_shared<DataTypeUInt64>()},
{"primary_key_bytes_in_memory", std::make_shared<DataTypeUInt64>()},
{"primary_key_bytes_in_memory_allocated", std::make_shared<DataTypeUInt64>()},
{"is_frozen", std::make_shared<DataTypeUInt8>()},
{"database", std::make_shared<DataTypeString>()},
{"table", std::make_shared<DataTypeString>()},
{"engine", std::make_shared<DataTypeString>()},
{"path", std::make_shared<DataTypeString>()},
{"hash_of_all_files", std::make_shared<DataTypeString>()},
{"hash_of_uncompressed_files", std::make_shared<DataTypeString>()},
{"uncompressed_hash_of_compressed_files", std::make_shared<DataTypeString>()}
}
)
{
}
void StorageSystemParts::processNextStorage(MutableColumns & columns, const StoragesInfo & info, bool has_state_column)
{
using State = MergeTreeDataPart::State;
MergeTreeData::DataPartStateVector all_parts_state;
MergeTreeData::DataPartsVector all_parts;
all_parts = info.getParts(all_parts_state, has_state_column);
for (size_t part_number = 0; part_number < all_parts.size(); ++part_number)
{
const auto & part = all_parts[part_number];
auto part_state = all_parts_state[part_number];
ColumnSize columns_size = part->getTotalColumnsSize();
size_t i = 0;
{
WriteBufferFromOwnString out;
part->partition.serializeText(*info.data, out, format_settings);
columns[i++]->insert(out.str());
}
columns[i++]->insert(part->name);
columns[i++]->insert(part_state == State::Committed);
columns[i++]->insert(part->getMarksCount());
columns[i++]->insert(part->rows_count);
columns[i++]->insert(part->bytes_on_disk.load(std::memory_order_relaxed));
columns[i++]->insert(columns_size.data_compressed);
columns[i++]->insert(columns_size.data_uncompressed);
columns[i++]->insert(columns_size.marks);
columns[i++]->insert(static_cast<UInt64>(part->modification_time));
time_t remove_time = part->remove_time.load(std::memory_order_relaxed);
columns[i++]->insert(static_cast<UInt64>(remove_time == std::numeric_limits<time_t>::max() ? 0 : remove_time));
/// For convenience, in returned refcount, don't add references that was due to local variables in this method: all_parts, active_parts.
columns[i++]->insert(static_cast<UInt64>(part.use_count() - 1));
columns[i++]->insert(part->getMinDate());
columns[i++]->insert(part->getMaxDate());
columns[i++]->insert(part->getMinTime());
columns[i++]->insert(part->getMaxTime());
columns[i++]->insert(part->info.partition_id);
columns[i++]->insert(part->info.min_block);
columns[i++]->insert(part->info.max_block);
columns[i++]->insert(part->info.level);
columns[i++]->insert(static_cast<UInt64>(part->info.getDataVersion()));
columns[i++]->insert(part->getIndexSizeInBytes());
columns[i++]->insert(part->getIndexSizeInAllocatedBytes());
columns[i++]->insert(part->is_frozen);
columns[i++]->insert(info.database);
columns[i++]->insert(info.table);
columns[i++]->insert(info.engine);
columns[i++]->insert(part->getFullPath());
if (has_state_column)
columns[i++]->insert(part->stateString());
MinimalisticDataPartChecksums helper;
helper.computeTotalChecksums(part->checksums);
auto checksum = helper.hash_of_all_files;
columns[i++]->insert(getHexUIntLowercase(checksum.first) + getHexUIntLowercase(checksum.second));
checksum = helper.hash_of_uncompressed_files;
columns[i++]->insert(getHexUIntLowercase(checksum.first) + getHexUIntLowercase(checksum.second));
checksum = helper.uncompressed_hash_of_compressed_files;
columns[i++]->insert(getHexUIntLowercase(checksum.first) + getHexUIntLowercase(checksum.second));
}
}
}