Users want to get rounding mode in `quantileExact` equivalent to "median_low" from Python:
https://docs.python.org/3/library/statistics.html#statistics.median_low
while current implementation works equivalent to "median_high" (?)
{
        this->data(place).merge(this->data(rhs));
    }
    void serialize(ConstAggregateDataPtr place, WriteBuffer & buf) const override
    {
        
        this->data(const_cast<AggregateDataPtr>(place)).serialize(buf);
    }
    void deserialize(AggregateDataPtr place, ReadBuffer & buf, Arena *) const override
    {
        this->data(place).deserialize(buf);
    }
    void insertResultInto(AggregateDataPtr place, IColumn & to, Arena *) const override
    {
        
        auto & data = this->data(place);
        if constexpr (returns_many)
        {
            ColumnArray & arr_to = assert_cast<ColumnArray &>(to);
            ColumnArray::Offsets & offsets_to = arr_to.getOffsets();
            size_t size = levels.size();