Function addElementSafe

src/DataTypes/Serializations/SerializationTuple.cpp:69–103

template <typename F>
static void addElementSafe(size_t num_elems, IColumn & column, F && impl)
{
    /// We use the assumption that tuples of zero size do not exist.
    size_t old_size = column.size();

    try
    {
        impl();

        // Check that all columns now have the same size.
        size_t new_size = column.size();
        for (auto i : collections::range(1, num_elems))
        {
            const auto & element_column = extractElementColumn(column, i);
            if (element_column.size() != new_size)
            {
                // This is not a logical error because it may work with
                // user-supplied data.
                throw Exception(ErrorCodes::SIZES_OF_COLUMNS_IN_TUPLE_DOESNT_MATCH,
                    "Cannot read a tuple because not all elements are present");
            }
        }
    }
    catch (...)
    {
        for (const auto & i : collections::range(0, num_elems))
        {
            auto & element_column = extractElementColumn(column, i);
            if (element_column.size() > old_size)
                element_column.popBack(1);
        }

        throw;
    }
}

void SerializationTuple::deserializeBinary(IColumn & column, ReadBuffer & istr) const
{