```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');

```

{
    return getVisibleDataPartsVector(local_context->getCurrentTransaction());
}
DataPartsVector MergeTreeData::getVisibleDataPartsVectorUnlocked(ContextPtr local_context, const DataPartsLock & lock) const