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 insert = [](ColumnAggregateFunction & column, const Field & value)
    {
        auto func = column.getAggregateFunction();
        Arena & arena = column.createOrGetArena();
        size_t size_of_state = func->sizeOfData();
        size_t align_of_state = func->alignOfData();
        auto * place = arena.alignedAlloc(size_of_state, align_of_state);
        func->create(place);
        auto value_column = func->getReturnType()->createColumnConst(1, value)->convertToFullColumnIfConst();
        const auto * value_column_ptr = value_column.get();
        func->add(place, &value_column_ptr, 0, &arena);
        column.insertFrom(place);
    };
    ASTPtr expression_ast;
    Block virtual_columns_block = getBlockWithVirtualPartColumns(parts, false , true /;
    if (virtual_columns_block.rows() == 0)
        return {};
    
    VirtualColumnUtils::prepareFilterBlockWithQuery(query_info.query, query_context, virtual_columns_block, expression_ast);
    if (expression_ast)
        VirtualColumnUtils::filterBlockWithQuery(query_info.query, virtual_columns_block, query_context, expression_ast);
    size_t rows = virtual_columns_block.rows();
    const ColumnString & part_name_column = typeid_cast<const ColumnString &>(*virtual_columns_block.getByName("_part").column);
    size_t part_idx = 0;
    for (size_t row = 0; row < rows; ++row)
    {
        while (parts[part_idx]->name != part_name_column.getDataAt(row))
            ++part_idx;
        const auto & part = parts[part_idx];
        if (!part->minmax_idx->initialized)