```sql
CREATE TABLE t
(
   id Int64, 
   d String,
   p Map(String, String)
   
)
ENGINE = ReplacingMergeTree order by id settings index_granularity  = 0;


insert into t values (1,  's', {'a':'b'});

CH starts eating RAM until it crashes

the same with

insert into t select 1,  's', map('a','b');

```

if (disk->isBroken())
                continue;
            if (!defined_disk_names.contains(disk_name)
                && disk->exists(relative_data_path)
                && !disk_names_wrapped_in_cache.contains(disk_name))
            {
                for (const auto it = disk->iterateDirectory(relative_data_path); it->isValid(); it->next())
                {
                    if (MergeTreePartInfo::tryParsePartName(it->name(), format_version))
                    {
                        throw Exception(
                            ErrorCodes::UNKNOWN_DISK,
                            "Part {} ({}) was found on disk {} which is not defined in the storage policy (defined disks: {}, wrapped disks: {})",
                            backQuote(it->name()), backQuote(it->path()), backQuote(disk_name),
                            fmt::join(defined_disk_names, ", "), fmt::join(disk_names_wrapped_in_cache, ", "));
                    }
                }
            }
        }
    }
    
    std::map<String, std::vector<std::pair<String, DiskPtr>>> disk_part_map;
    ThreadPool pool(disks.size());
    for (const auto & disk_ptr : disks)
    {
        if (disk_ptr->isBroken())
            continue;
        auto & disk_parts = disk_part_map[disk_ptr->getName()];
        pool.scheduleOrThrowOnError([&, disk_ptr]()
        {