```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 (parts_mover.moves_blocker.isCancelled())
        return false;
    auto moving_tagger = selectPartsForMove();
    if (moving_tagger->parts_to_move.empty())
        return false;
    assignee.scheduleMoveTask(std::make_shared<ExecutableLambdaAdapter>(
        [this, moving_tagger] () mutable
        {
            return moveParts(moving_tagger);
        }, moves_assignee_trigger, getStorageID()));
    return true;
}
bool MergeTreeData::areBackgroundMovesNeeded() const
{
    auto policy = getStoragePolicy();
    if (policy->getVolumes().size() > 1)
        return true;
    return policy->getVolumes().size() == 1 && policy->getVolumes()[0]->getDisks().size() > 1;
}
bool MergeTreeData::movePartsToSpace(const DataPartsVector & parts, SpacePtr space)