Method doGetSerialization

src/DataTypes/DataTypeMap.cpp:120–141

}

SerializationPtr DataTypeMap::doGetSerialization(const SerializationInfoSettings & settings) const
{
    SerializationPtr key_serialization;
    SerializationPtr value_serialization;
    if (settings.propagate_types_serialization_versions_to_nested_types)
    {
        key_serialization = key_type->getSerialization(settings);
        value_serialization = value_type->getSerialization(settings);
    }
    else
    {
        key_serialization = key_type->getDefaultSerialization();
        value_serialization = value_type->getDefaultSerialization();
    }

    /// Don't use nested->getSerialization() to avoid creating exponentially growing number of serializations for deep nested maps.
    /// Instead, reuse already created serializations for keys and values.
    auto key_serialization_named = std::static_pointer_cast<const SerializationNamed>(SerializationNamed::create(key_serialization, "keys", SubstreamType::TupleElement));
    auto value_serialization_named = std::static_pointer_cast<const SerializationNamed>(SerializationNamed::create(value_serialization, "values", SubstreamType::TupleElement));
    auto nested_serialization = SerializationArray::create(SerializationTuple::create(SerializationTuple::ElementSerializations{key_serialization_named, value_serialization_named}, true));
    return SerializationMap::create(key_serialization, value_serialization, nested_serialization, settings.map_serialization_version);
}

bool DataTypeMap::equals(const IDataType & rhs) const
{