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 

{
    auto new_column_ttls = new_metadata.column_ttls_by_name;
    if (!new_column_ttls.empty())
    {
        NameSet columns_ttl_forbidden;
        if (old_metadata.hasPartitionKey())
            for (const auto & col : old_metadata.getColumnsRequiredForPartitionKey())
                columns_ttl_forbidden.insert(col);
        if (old_metadata.hasSortingKey())
            for (const auto & col : old_metadata.getColumnsRequiredForSortingKey())
                columns_ttl_forbidden.insert(col);
        for (const auto & [name, ttl_description] : new_column_ttls)
        {
            if (columns_ttl_forbidden.count(name))
                throw Exception("Trying to set TTL for key column " + name, ErrorCodes::ILLEGAL_COLUMN);
        }
    }
    auto new_table_ttl = new_metadata.table_ttl;
    if (new_table_ttl.definition_ast)
    {
        for (const auto & move_ttl : new_table_ttl.move_ttl)
        {
            if (!getDestinationForMoveTTL(move_ttl))
            {
                String message;
                if (move_ttl.destination_type == DataDestinationType::DISK)
                    message = "No such disk " + backQuote(move_ttl.destination_name) + " for given storage policy.";
                else
                    message = "No such volume " + backQuote(move_ttl.destination_name) + " for given storage policy.";