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
QueryProcessingStage::Enum processing_stage, QueryPlan & query_plan,
    const PrewhereInfoPtr & prewhere_info, const Names & columns_to_remove_after_prewhere)
{
    auto & query = getSelectQuery();
    const Settings & settings = context->getSettingsRef();
    
    bool optimize_trivial_count =
        syntax_analyzer_result->optimize_trivial_count
        && storage
        && storage->getName() != "MaterializeMySQL"
        && !filter_info
        && processing_stage == QueryProcessingStage::FetchColumns
        && query_analyzer->hasAggregation()
        && (query_analyzer->aggregates().size() == 1)
        && typeid_cast<AggregateFunctionCount *>(query_analyzer->aggregates()[0].function.get());
    if (optimize_trivial_count)
    {
        const auto & desc = query_analyzer->aggregates()[0];
        const auto & func = desc.function;
        std::optional<UInt64> num_rows = storage->totalRows();
        if (num_rows)
        {
            AggregateFunctionCount & agg_count = static_cast<AggregateFunctionCount &>(*func);