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

Some times there are not output from requests.
{
    switch (merge_type)
    {
        case MergeType::Regular:
            return REGULAR_MERGE;
        case MergeType::TTLDelete:
            return TTL_DELETE_MERGE;
        case MergeType::TTLRecompress:
            return TTL_RECOMPRESS_MERGE;
    }
    throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Unknown MergeType {}", static_cast<UInt64>(merge_type));
}
PartLogElement::PartMergeAlgorithm PartLogElement::getMergeAlgorithm(MergeAlgorithm merge_algorithm_)
{
    switch (merge_algorithm_)
    {
        case MergeAlgorithm::Undecided:
            return UNDECIDED;
        case MergeAlgorithm::Horizontal:
            return HORIZONTAL;
        case MergeAlgorithm::Vertical:
            return VERTICAL;
    }
    throw Exception(ErrorCodes::NOT_IMPLEMENTED, "Unknown MergeAlgorithm {}", static_cast<UInt64>(merge_algorithm_));
}
NamesAndTypesList PartLogElement::getNamesAndTypes()