
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  

execute(const ColumnsWithTypeAndName & arguments, const DataTypePtr & result_type, size_t input_rows_count, bool dry_run) const override
    {
        if (kind == Kind::LEFT_CONST)
        {
            ColumnsWithTypeAndName new_arguments;
            new_arguments.reserve(arguments.size() + 1);
            new_arguments.push_back(const_arg);
            for (const auto & arg : arguments)
                new_arguments.push_back(arg);
            return func->prepare(new_arguments)->execute(new_arguments, result_type, input_rows_count, dry_run);
        }
        else if (kind == Kind::RIGHT_CONST)
        {
            auto new_arguments = arguments;
            new_arguments.push_back(const_arg);
            return func->prepare(new_arguments)->execute(new_arguments, result_type, input_rows_count, dry_run);
        }
        else
            return func->prepare(arguments)->execute(arguments, result_type, input_rows_count, dry_run);
    }
    bool isDeterministic() const override { return func->isDeterministic(); }
    bool isDeterministicInScopeOfQuery() const override { return func->isDeterministicInScopeOfQuery(); }
    bool hasInformationAboutMonotonicity() const override { return func->hasInformationAboutMonotonicity(); }
    bool isSuitableForShortCircuitArgumentsExecution(const DataTypesWithConstInfo & arguments) const override { return func->isSuitableForShortCircuitArgumentsExecution(arguments); }
    IFunctionBase::Monotonicity getMonotonicityForRange(const IDataType & type, const Field & left, const Field & right) const override
    {
        return func->getMonotonicityForRange(type, left, right);
    }
    Kind getKind() const { return kind; }
    const ColumnWithTypeAndName & getConstArg() const { return const_arg; }