Statistics
https://play.clickhouse.com/play?user=play#c2VsZWN0IAp0b1N0YXJ0T2ZIb3VyKGNoZWNrX3N0YXJ0X3RpbWUpIGFzIGQsCmNvdW50KCksICBncm91cFVuaXFBcnJheShwdWxsX3JlcXVlc3RfbnVtYmVyKSwgIGFueShyZXBvcnRfdXJsKQpmcm9tIGNoZWNrcyB3aGVyZSAnMjAyMi0wNi0wMScgPD0gY2hlY2tfc3RhcnRfdGltZSBhbmQgdGVzdF9uYW1lIGxpa2UgJyUwMjQ5MV9wYXJ0X2xvZ19oYXNfdGFibGVfdXVpZCUnIGFuZCB0ZXN0X3N0YXR1cyBpbiAoJ0ZBSUwnLCAnRkxBS1knKSBncm91cCBieSBkIG9yZGVyIGJ5IGQgZGVzYw==

Some times there are not output from requests.
{
    size_t i = 0;
    columns[i++]->insert(query_id);
    columns[i++]->insert(event_type);
    columns[i++]->insert(merge_reason);
    columns[i++]->insert(merge_algorithm);
    columns[i++]->insert(DateLUT::instance().toDayNum(event_time).toUnderType());
    columns[i++]->insert(event_time);
    columns[i++]->insert(event_time_microseconds);
    columns[i++]->insert(duration_ms);
    columns[i++]->insert(database_name);
    columns[i++]->insert(table_name);
    columns[i++]->insert(part_name);
    columns[i++]->insert(partition_id);
    columns[i++]->insert(part_type.toString());
    columns[i++]->insert(disk_name);
    columns[i++]->insert(path_on_disk);
    columns[i++]->insert(rows);
    columns[i++]->insert(bytes_compressed_on_disk);
    Array source_part_names_array;
    source_part_names_array.reserve(source_part_names.size());
    for (const auto & name : source_part_names)
        source_part_names_array.push_back(name);
    columns[i++]->insert(source_part_names_array);