```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');

```

auto it = projections.find(candidate.desc->name);
        if (it != projections.end())
            projection_parts.push_back(it->second);
        else
            normal_parts.push_back(part);
    }
    if (projection_parts.empty())
        return;
    auto projection_result_ptr = reader.estimateNumMarksToRead(
        projection_parts,
        candidate.prewhere_info,
        candidate.required_columns,
        storage_snapshot->metadata,
        candidate.desc->metadata,
        query_info,
        added_filter_nodes,
        query_context,
        settings.max_threads,
        max_added_blocks);
    if (projection_result_ptr->error())
        return;
    auto sum_marks = projection_result_ptr->marks();
    if (normal_parts.empty())
    {
        
        
        candidate.complete = true;
    }
    else
    {