We just chatted offline. Should be fixed by https://github.com/apache/arrow/pull/1704.
On Mon, Mar 5, 2018 at 3:42 AM Mitar <mmi...@gmail.com> wrote: > Hi! > > You mean, this explains why a subclass of list is not being matched? Maybe. > > But I do not get why my custom serialization for ndarray subclass is > never called. > > Or how hard would it be to automatically serialize/deserialize into > subclasses so that I would not have to have a custom serialization for > ndarray but the existing ndarray serialization would work, casting it > into a proper subclass. > > > Mitar > > On Sun, Mar 4, 2018 at 2:39 PM, Robert Nishihara > <robertnishih...@gmail.com> wrote: > > The issue is probably this line > > > > > https://github.com/apache/arrow/blob/8b1c8118b017a941f0102709d72df7e5a9783aa4/cpp/src/arrow/python/python_to_arrow.cc#L504 > > > > which uses PyList_Check instead of PyList_CheckExact. Changing it to the > > exact form will cause it to use the custom serializer for subclasses of > > list. > > > > On Sun, Mar 4, 2018 at 1:08 AM Mitar <mmi...@gmail.com> wrote: > >> > >> Hi! > >> > >> I have a subclass of numpy and another of pandas which add a metadata > >> attribute to them. Moreover, I have a subclass of typing.List as a > >> Python generic with this metadata attribute as well. > >> > >> Now, it seems if I serialize this to plasma store and back I get > >> standard numpy, pandas, or list back, respectively. > >> > >> My question is: how can I make it so that proper subclasses are > >> returned, including the custom metadata attribute? > >> > >> I tried to use pyarrow_lib._default_serialization_context.register_type > >> but it does not seem to work. Moreover, I still worry that even if I > >> create a serialization for a custom class, if anyone makes a subclass > >> and tries to store it plasma store they will get back the custom class > >> and not a subclass. > >> > >> This is how I am testing: > >> > >> > >> > https://gitlab.com/datadrivendiscovery/metadata/blob/plasma/tests/test_plasma.py#L50 > >> > >> And here is the code for custom numpy class and attempt at registering > >> custom serialization: > >> > >> > >> > https://gitlab.com/datadrivendiscovery/metadata/blob/plasma/d3m_metadata/container/numpy.py#L135 > >> > >> It looks like custom serialization is not called. > >> > >> > >> Mitar > >> > >> -- > >> http://mitar.tnode.com/ > >> https://twitter.com/mitar_m > > > > -- > http://mitar.tnode.com/ > https://twitter.com/mitar_m >