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

#include <Interpreters/Context.h>
#include <Storages/MergeTree/MergeList.h>
#include <Storages/System/StorageSystemMerges.h>


namespace DB
{

NamesAndTypesList StorageSystemMerges::getNamesAndTypes()
{
    return {
        {"database", std::make_shared<DataTypeString>()},
        {"table", std::make_shared<DataTypeString>()},
        {"elapsed", std::make_shared<DataTypeFloat64>()},
        {"progress", std::make_shared<DataTypeFloat64>()},
        {"num_parts", std::make_shared<DataTypeUInt64>()},
        {"source_part_names", std::make_shared<DataTypeArray>(std::make_shared<DataTypeString>())},
        {"result_part_name", std::make_shared<DataTypeString>()},
        {"total_size_bytes_compressed", std::make_shared<DataTypeUInt64>()},
        {"total_size_marks", std::make_shared<DataTypeUInt64>()},
        {"bytes_read_uncompressed", std::make_shared<DataTypeUInt64>()},
        {"rows_read", std::make_shared<DataTypeUInt64>()},
        {"bytes_written_uncompressed", std::make_shared<DataTypeUInt64>()},
        {"rows_written", std::make_shared<DataTypeUInt64>()},
        {"columns_written", std::make_shared<DataTypeUInt64>()},
        {"memory_usage", std::make_shared<DataTypeUInt64>()},
        {"thread_number", std::make_shared<DataTypeUInt64>()},
    };
}


void StorageSystemMerges::fillData(MutableColumns & res_columns, const Context & context, const SelectQueryInfo &) const
{
    for (const auto & merge : context.getMergeList().get())
    {
        if (context.hasDatabaseAccessRights(merge.database))
        {
            size_t i = 0;
            res_columns[i++]->insert(merge.database);
            res_columns[i++]->insert(merge.table);
            res_columns[i++]->insert(merge.elapsed);
            res_columns[i++]->insert(merge.progress);
            res_columns[i++]->insert(merge.num_parts);
            res_columns[i++]->insert(merge.source_part_names);
            res_columns[i++]->insert(merge.result_part_name);
            res_columns[i++]->insert(merge.total_size_bytes_compressed);
            res_columns[i++]->insert(merge.total_size_marks);
            res_columns[i++]->insert(merge.bytes_read_uncompressed);
            res_columns[i++]->insert(merge.rows_read);
            res_columns[i++]->insert(merge.bytes_written_uncompressed);
            res_columns[i++]->insert(merge.rows_written);
            res_columns[i++]->insert(merge.columns_written);
            res_columns[i++]->insert(merge.memory_usage);
            res_columns[i++]->insert(merge.thread_number);
        }
    }
}

}