
create table test1 (a Float32,  b Float32 ) engine = MergeTree order by a ;
insert into test1 values (0.1,0.1), (0.2,0.2);
select count() from test1 where b = 0.1;
0 
select count() from test1 where b = toFloat32(0.1);
1
select count() from test1 where a > 0;
0
select count() from test1 where a > 0.0;
2
select count() from test1 where b > 0;
2

version 22.1.3.7  

Range key_range,
    const MonotonicFunctionsChain & functions,
    DataTypePtr current_type,
    bool single_point)
{
    for (const auto & func : functions)
    {
        
        
        IFunction::Monotonicity monotonicity = single_point
            ? IFunction::Monotonicity{true}
            : func->getMonotonicityForRange(*current_type.get(), key_range.left, key_range.right);
        if (!monotonicity.is_monotonic)