I am reading clickhouse mutation code. In StorageMergeTree->selectPartsToMutate() function, there is a check 
`if (current_ast_elements + commands_size >= max_ast_elements)
                break;`

I think if there are many mutations then the check result will be true, so that it will skip the remaining mutations.
But the new part's mutation is set to the last one in mutation map, and it does not apply the remaining mutations actually.
`new_part_info.mutation = current_mutations_by_version.rbegin()->first;`

Then the new part will miss the remaining mutations in future mutation job.

I think it's wrong here. Am I right?

If it is right, I will submit a PR 

if (part->getState() == DataPartState::Committed)
            active_parts_names.push_back(part->name);
        forgetPartAndMoveToDetached(part);
    }
    LOG_INFO(log, "Moved all parts to detached/");
    const bool is_first_replica = createTableIfNotExists(metadata_snapshot);
    LOG_INFO(log, "Created initial ZK nodes, replica is first: {}", is_first_replica);
    if (!is_first_replica)
        createReplica(metadata_snapshot);
    createNewZooKeeperNodes();
    LOG_INFO(log, "Created ZK nodes for table");
    is_readonly = false;
    has_metadata_in_zookeeper = true;
    if (is_first_replica)
        for (const String& part_name : active_parts_names)
            attachPartition(std::make_shared<ASTLiteral>(part_name), metadata_snapshot, true, getContext());
    LOG_INFO(log, "Attached all partitions, starting table");
    startup();
    are_restoring_replica.store(false);
}
void StorageReplicatedMergeTree::dropPartNoWaitNoThrow(const String & part_name)
{
    assertNotReadonly();
    if (!is_leader)
        throw Exception("DROP PART cannot be done on this replica because it is not a leader", ErrorCodes::NOT_A_LEADER);
    zkutil::ZooKeeperPtr zookeeper = getZooKeeper();
    LogEntry entry;
    dropPartImpl(zookeeper, part_name, entry,  false,  false);
}
void StorageReplicatedMergeTree::dropPart(const String & part_name, bool detach, ContextPtr query_context)