20.10.1.4853

```sql
drop table if exists xp;
drop table if exists xp_d;

create table xp(A Date, B Int64, S String) Engine=MergeTree partition by toYYYYMM(A) order by B;
insert into xp select '2020-01-01', number , '' from numbers(100000);
insert into xp select '2020-10-01', number , '' from numbers(100000);
create table xp_d as xp Engine=Distributed(test_shard_localhost, currentDatabase(), xp);

select count() from xp_d prewhere toYYYYMM(A) global in (select toYYYYMM(min(A)) from xp_d) where B > -1;
┌─count()─┐
│       0 │     <------ expected 100000
└─────────┘

-- global in & both predicates in prewhere 
select count() from xp_d prewhere toYYYYMM(A) global in (select toYYYYMM(min(A)) from xp_d) and B > -1;
┌─count()─┐
│  100000 │
└─────────┘

-- global in & both predicates in where 
select count() from xp_d where toYYYYMM(A) global in (select toYYYYMM(min(A)) from xp_d) and B > -1;
┌─count()─┐
│  100000 │
└─────────┘

-- not global
select count() from xp_d prewhere toYYYYMM(A) in (select toYYYYMM(min(A)) from xp_d) where B > -1;
┌─count()─┐
│  100000 │
└─────────┘



select count() from xp_d prewhere toYYYYMM(A) global in (select 202001) where B > -1;
┌─count()─┐
│       0 │
└─────────┘
```

hmm, it worked in 19.13.7.57
auto merge_sorting_step = std::make_unique<MergeSortingStep>(
            query_plan.getCurrentDataStream(),
            output_order_descr, settings.max_block_size, limit,
            settings.max_bytes_before_remerge_sort,
            settings.max_bytes_before_external_sort, context->getTemporaryVolume(),
            settings.min_free_disk_space_for_temporary_data);
    merge_sorting_step->setStepDescription("Merge sorted blocks for ORDER BY");
    query_plan.addStep(std::move(merge_sorting_step));
    
    executeMergeSorted(query_plan, output_order_descr, limit, "for ORDER BY");
}
void InterpreterSelectQuery::executeMergeSorted(QueryPlan & query_plan, const std::string & description)
{
    auto & query = getSelectQuery();
    SortDescription order_descr = getSortDescription(query, *context);
    UInt64 limit = getLimitForSorting(query, *context);
    executeMergeSorted(query_plan, order_descr, limit, description);
}
void InterpreterSelectQuery::executeMergeSorted(QueryPlan & query_plan, const SortDescription & sort_description, UInt64 limit, const std::string & description)
{
    const Settings & settings = context->getSettingsRef();
    auto merging_sorted = std::make_unique<MergingSortedStep>(
            query_plan.getCurrentDataStream(),
            sort_description,
            settings.max_block_size, limit);
    merging_sorted->setStepDescription("Merge sorted streams " + description);
    query_plan.addStep(std::move(merging_sorted));
}
void InterpreterSelectQuery::executeProjection(QueryPlan & query_plan, const ExpressionActionsPtr & expression)