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 

DataPartsVector getAllDataPartsVector(DataPartStateVector * out_states = nullptr, bool require_projection_parts = false) const;
    
    DetachedPartsInfo getDetachedParts() const;
    static void validateDetachedPartName(const String & name);
    void dropDetached(const ASTPtr & partition, bool part, ContextPtr context);
    MutableDataPartsVector tryLoadPartsToAttach(const ASTPtr & partition, bool attach_part,
            ContextPtr context, PartsTemporaryRename & renamed_parts);
    
    DataParts getDataParts() const;
    DataPartsVector getDataPartsVector() const;
    
    DataPartPtr getActiveContainingPart(const String & part_name) const;
    DataPartPtr getActiveContainingPart(const MergeTreePartInfo & part_info) const;
    DataPartPtr getActiveContainingPart(const MergeTreePartInfo & part_info, DataPartState state, DataPartsLock & lock) const;
    
    
    void swapActivePart(MergeTreeData::DataPartPtr part_copy);
    
    DataPartsVector getDataPartsVectorInPartition(DataPartState state, const String & partition_id) const;
    DataPartsVector getDataPartsVectorInPartitions(DataPartState state, const std::unordered_set<String> & partition_ids) const;
    
    DataPartPtr getPartIfExists(const String & part_name, const DataPartStates & valid_states);
    DataPartPtr getPartIfExists(const MergeTreePartInfo & part_info, const DataPartStates & valid_states);
    
    size_t getTotalActiveSizeInBytes() const;
    size_t getTotalActiveSizeInRows() const;
    size_t getPartsCount() const;
    size_t getMaxPartsCountForPartitionWithState(DataPartState state) const;
    size_t getMaxPartsCountForPartition() const;