```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');

```

query_info.merge_tree_empty_result = true;
        return std::nullopt;
    }
    if (selected_candidate->desc->type == ProjectionDescription::Type::Aggregate)
    {
        selected_candidate->aggregation_keys = select.getQueryAnalyzer()->aggregationKeys();
        selected_candidate->aggregate_descriptions = select.getQueryAnalyzer()->aggregates();
    }
    return *selected_candidate;
}
QueryProcessingStage::Enum MergeTreeData::getQueryProcessingStage(
    ContextPtr query_context,
    QueryProcessingStage::Enum to_stage,
    const StorageSnapshotPtr & storage_snapshot,
    SelectQueryInfo & query_info) const
{
    if (to_stage >= QueryProcessingStage::Enum::WithMergeableState)
    {
        if (auto projection = getQueryProcessingStageWithAggregateProjection(query_context, storage_snapshot, query_info))
        {
            query_info.projection = std::move(projection);
            if (query_info.projection->desc->type == ProjectionDescription::Type::Aggregate)
                return QueryProcessingStage::Enum::WithMergeableState;
        }
        else
            query_info.projection = std::nullopt;
    }
    return QueryProcessingStage::Enum::FetchColumns;
}
MergeTreeData & MergeTreeData::checkStructureAndGetMergeTreeData(IStorage & source_table, const StorageMetadataPtr & src_snapshot, const StorageMetadataPtr & my_snapshot) const