select count(), count(a), max(a), min(a), avg(a), sum(a), any(a)
from (select cast(Null,'Nullable(Float64)') a);

select countMerge(cnts), countMerge(cntsa), maxMerge(maxs), minMerge(mins), avgMerge(avgs), sumMerge(sums), anyMerge(anys) from (
select countState() cnts, countState(a) cntsa, maxState(a) maxs, minState(a) mins, avgState(a) avgs, sumState(a) sums, anyState(a) anys
from (select cast(Null,'Nullable(Float64)') a));


select '--- empty resultset ---';


select count(), count(a), max(a), min(a), avg(a), sum(a), any(a)
from (select cast(1,'Nullable(Float64)') a) where a =0;

select countMerge(cnts), countMerge(cntsa), maxMerge(maxs), minMerge(mins), avgMerge(avgs), sumMerge(sums), anyMerge(anys) from (
select countState() cnts, countState(a) cntsa, maxState(a) maxs, minState(a) mins, avgState(a) avgs, sumState(a) sums, anyState(a) anys
from (select cast(1,'Nullable(Float64)') a) where a =0 );