ClickHouse/dbms/src/Storages/System/StorageSystemProcesses.cpp

#include <Columns/ColumnString.h>
#include <DataTypes/DataTypeString.h>
#include <DataTypes/DataTypesNumber.h>
#include <DataStreams/OneBlockInputStream.h>
#include <Interpreters/ProcessList.h>
#include <Storages/System/StorageSystemProcesses.h>
#include <Interpreters/Context.h>


namespace DB
{


StorageSystemProcesses::StorageSystemProcesses(const std::string & name_)
    : name(name_)
{
    columns = NamesAndTypesList{
        { "is_initial_query",     std::make_shared<DataTypeUInt8>() },

        { "user",                 std::make_shared<DataTypeString>() },
        { "query_id",             std::make_shared<DataTypeString>() },
        { "address",              std::make_shared<DataTypeString>() },
        { "port",                 std::make_shared<DataTypeUInt16>() },

        { "initial_user",         std::make_shared<DataTypeString>() },
        { "initial_query_id",     std::make_shared<DataTypeString>() },
        { "initial_address",      std::make_shared<DataTypeString>() },
        { "initial_port",         std::make_shared<DataTypeUInt16>() },

        { "interface",            std::make_shared<DataTypeUInt8>() },

        { "os_user",              std::make_shared<DataTypeString>() },
        { "client_hostname",      std::make_shared<DataTypeString>() },
        { "client_name",          std::make_shared<DataTypeString>() },
        { "client_version_major", std::make_shared<DataTypeUInt64>() },
        { "client_version_minor", std::make_shared<DataTypeUInt64>() },
        { "client_revision",      std::make_shared<DataTypeUInt64>() },

        { "http_method",          std::make_shared<DataTypeUInt8>() },
        { "http_user_agent",      std::make_shared<DataTypeString>() },

        { "quota_key",            std::make_shared<DataTypeString>() },

        { "elapsed",              std::make_shared<DataTypeFloat64>() },
        { "read_rows",            std::make_shared<DataTypeUInt64>() },
        { "read_bytes",           std::make_shared<DataTypeUInt64>() },
        { "total_rows_approx",    std::make_shared<DataTypeUInt64>() },
        { "written_rows",         std::make_shared<DataTypeUInt64>() },
        { "written_bytes",        std::make_shared<DataTypeUInt64>() },
        { "memory_usage",         std::make_shared<DataTypeInt64>() },
        { "query",                std::make_shared<DataTypeString>() }
    };
}


BlockInputStreams StorageSystemProcesses::read(
    const Names & column_names,
    const SelectQueryInfo &,
    const Context & context,
    QueryProcessingStage::Enum & processed_stage,
    const size_t /*max_block_size*/,
    const unsigned /*num_streams*/)
{
    check(column_names);
    processed_stage = QueryProcessingStage::FetchColumns;

    ProcessList::Info info = context.getProcessList().getInfo();

    MutableColumns res_columns = getSampleBlock().cloneEmptyColumns();

    for (const auto & process : info)
    {
        size_t i = 0;
        res_columns[i++]->insert(UInt64(process.client_info.query_kind == ClientInfo::QueryKind::INITIAL_QUERY));
        res_columns[i++]->insert(process.client_info.current_user);
        res_columns[i++]->insert(process.client_info.current_query_id);
        res_columns[i++]->insert(process.client_info.current_address.host().toString());
        res_columns[i++]->insert(UInt64(process.client_info.current_address.port()));
        res_columns[i++]->insert(process.client_info.initial_user);
        res_columns[i++]->insert(process.client_info.initial_query_id);
        res_columns[i++]->insert(process.client_info.initial_address.host().toString());
        res_columns[i++]->insert(UInt64(process.client_info.initial_address.port()));
        res_columns[i++]->insert(UInt64(process.client_info.interface));
        res_columns[i++]->insert(process.client_info.os_user);
        res_columns[i++]->insert(process.client_info.client_hostname);
        res_columns[i++]->insert(process.client_info.client_name);
        res_columns[i++]->insert(process.client_info.client_version_major);
        res_columns[i++]->insert(process.client_info.client_version_minor);
        res_columns[i++]->insert(UInt64(process.client_info.client_revision));
        res_columns[i++]->insert(UInt64(process.client_info.http_method));
        res_columns[i++]->insert(process.client_info.http_user_agent);
        res_columns[i++]->insert(process.client_info.quota_key);
        res_columns[i++]->insert(process.elapsed_seconds);
        res_columns[i++]->insert(UInt64(process.read_rows));
        res_columns[i++]->insert(UInt64(process.read_bytes));
        res_columns[i++]->insert(UInt64(process.total_rows));
        res_columns[i++]->insert(UInt64(process.written_rows));
        res_columns[i++]->insert(UInt64(process.written_bytes));
        res_columns[i++]->insert(process.memory_usage);
        res_columns[i++]->insert(process.query);
    }

    return BlockInputStreams(1, std::make_shared<OneBlockInputStream>(getSampleBlock().cloneWithColumns(std::move(res_columns))));
}


}