NanoEventsFactory is not able to read RNTuple NanoAOD file in coffea 2025.1.1

[oshadura]

Describe the bug
NanoEventsFactory is not able to read RNTuple NanoAOD file.

Environment:

awkward: 2.7.4
dask-awkward: 2025.2.0
uproot: 5.5.2
hist: 2.8.0
coffea: 2025.1.1

To Reproduce
Steps to reproduce the behavior:

1. Use https://github.com/iris-hep/calver-coffea-agc-demo with latest uprtoot version 5.5.2 (which is fixing TypeError: Model_ROOT_3a3a_RNTuple.keys() got an unexpected keyword argument 'filter_branch' #1350) and change in cell 5 to switch to RNTuple file v1:

ttbar_file = "https://xrootd-local.unl.edu:1094//store/user/AGC/rntuple/rntuple-v1-128MiB/nanoAOD/ST_s-channel_4f_InclusiveDecays_13TeV-amcatnlo-pythia8/cmsopendata2015_single_top_s_chan_19394_PU25nsData2015v1_76X_mcRun2_asymptotic_v12-v1_00000_0000.root"

Output

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[3], line 3
      1 ttbar_file = "https://xrootd-local.unl.edu:1094//store/user/AGC/rntuple/rntuple-v1-128MiB/nanoAOD/ST_s-channel_4f_InclusiveDecays_13TeV-amcatnlo-pythia8/cmsopendata2015_single_top_s_chan_19394_PU25nsData2015v1_76X_mcRun2_asymptotic_v12-v1_00000_0000.root"
----> 3 events = NanoEventsFactory.from_root({ttbar_file: "Events"}, schemaclass=NanoAODSchema).events()
      5 # create the task graph to build a histogram
      6 reconstructed_top_mass = calculate_trijet_mass(events)

File /usr/local/lib/python3.12/site-packages/coffea/nanoevents/factory.py:715, in NanoEventsFactory.events(self)
    702 """
    703 Build events
    704 
   (...)
    712         array of the events.
    713 """
    714 if self._is_dask:
--> 715     events = self._mapping(form_mapping=self._schema)
    716     report = None
    717     if isinstance(events, tuple):

File [/usr/local/lib/python3.12/site-packages/uproot/_dask.py:296](https://coffea.casa/usr/local/lib/python3.12/site-packages/uproot/_dask.py#line=295), in dask(files, filter_name, filter_typename, filter_branch, recursive, full_paths, step_size, steps_per_file, library, ak_add_doc, custom_classes, allow_missing, open_files, form_mapping, allow_read_errors_with_report, known_base_form, decompression_executor, interpretation_executor, **options)
    277         return _get_dak_array(
    278             files,
    279             filter_name,
   (...)
    293             interpretation_executor,
    294         )
    295     else:
--> 296         return _get_dak_array_delay_open(
    297             files,
    298             filter_name,
    299             filter_typename,
    300             filter_branch,
    301             recursive,
    302             full_paths,
    303             custom_classes,
    304             allow_missing,
    305             real_options,
    306             interp_options,
    307             form_mapping,
    308             steps_per_file,
    309             allow_read_errors_with_report,
    310             known_base_form,
    311             decompression_executor,
    312             interpretation_executor,
    313         )
    314 else:
    315     raise NotImplementedError()

File [/usr/local/lib/python3.12/site-packages/uproot/_dask.py:1616](https://coffea.casa/usr/local/lib/python3.12/site-packages/uproot/_dask.py#line=1615), in _get_dak_array_delay_open(files, filter_name, filter_typename, filter_branch, recursive, full_paths, custom_classes, allow_missing, real_options, interp_options, form_mapping, steps_per_file, allow_read_errors_with_report, known_base_form, decompression_executor, interpretation_executor)
   1605     obj = uproot._util.regularize_object_path(
   1606         ffile_path, fobject_path, custom_classes, allow_missing, real_options
   1607     )
   1608     common_keys = obj.keys(
   1609         recursive=recursive,
   1610         filter_name=filter_name,
   (...)
   1614         ignore_duplicates=True,
   1615     )
-> 1616     base_form = _get_ttree_form(
   1617         awkward, obj, common_keys, interp_options.get("ak_add_doc")
   1618     )
   1620 divisions = [0]
   1621 partition_args = []

File [/usr/local/lib/python3.12/site-packages/uproot/_dask.py:1385](https://coffea.casa/usr/local/lib/python3.12/site-packages/uproot/_dask.py#line=1384), in _get_ttree_form(awkward, ttree, common_keys, ak_add_doc)
   1383 for key in common_keys:
   1384     branch = ttree[key]
-> 1385     content_form = branch.interpretation.awkward_form(ttree.file)
   1386     if ak_add_doc:
   1387         content_form = content_form.copy(parameters={"__doc__": branch.title})

AttributeError: 'RNTupleField' object has no attribute 'interpretation'

Additional context
@ariostas I opened this issue to be able to track progress

[ikrommyd]

That's coming from uproot.dask directly. In uproot/_dask.py:1385, the code assumes that there is an .interpretation attribute for all the branches. Reading with uproot.dask doesn't work either. It's an uproot issue.

In [1]: ttbar_file = "https://xrootd-local.unl.edu:1094//store/user/AGC/rntuple/rntuple-v1-128MiB/nanoAOD/ST_s-channel_4f_InclusiveDecays_13TeV-amcatnlo-pythia8/cmsopendata2015_single_top_s_chan_19394_PU25nsData2015v1_76X_mcRun2_asymptotic_v12-v1_00000_0000.root"

In [2]: import uproot

In [3]: events = uproot.dask({ttbar_file: "Events"})
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
Cell In[3], line 1
----> 1 events = uproot.dask({ttbar_file: "Events"})

File ~/Dropbox/work/coffea_dev/uproot5/src/uproot/_dask.py:277, in dask(files, filter_name, filter_typename, filter_branch, recursive, full_paths, step_size, steps_per_file, library, ak_add_doc, custom_classes, allow_missing, open_files, form_mapping, allow_read_errors_with_report, known_base_form, decompression_executor, interpretation_executor, **options)
    275 elif library.name == "ak":
    276     if open_files:
--> 277         return _get_dak_array(
    278             files,
    279             filter_name,
    280             filter_typename,
    281             filter_branch,
    282             recursive,
    283             full_paths,
    284             step_size,
    285             custom_classes,
    286             allow_missing,
    287             real_options,
    288             interp_options,
    289             form_mapping,
    290             steps_per_file,
    291             allow_read_errors_with_report,
    292             decompression_executor,
    293             interpretation_executor,
    294         )
    295     else:
    296         return _get_dak_array_delay_open(
    297             files,
    298             filter_name,
   (...)
    312             interpretation_executor,
    313         )

File ~/Dropbox/work/coffea_dev/uproot5/src/uproot/_dask.py:1502, in _get_dak_array(files, filter_name, filter_typename, filter_branch, recursive, full_paths, step_size, custom_classes, allow_missing, real_options, interp_options, form_mapping, steps_per_file, allow_read_errors_with_report, decompression_executor, interpretation_executor)
   1500 for key in common_keys:
   1501     branch = ttree[key]
-> 1502     branchid_interpretation[branch.cache_key] = branch.interpretation
   1503 ttree_step = _regularize_step_size(
   1504     ttree, step_size, entry_start, entry_stop, branchid_interpretation
   1505 )
   1506 step_sum += int(ttree_step)

AttributeError: 'RNTupleField' object has no attribute 'interpretation'

[ikrommyd]

Should be moved to uproot.

[alexander-held]

We can move issues between scikit-hep projects so any reason not to migrate it over?

[ikrommyd]

We can move issues between scikit-hep projects so any reason not to migrate it over?

I actually just didn't know that. Reopened then.

[oshadura]

@ikrommyd I wanted Andres to look into this issue before you closed it.

[ikrommyd]

@ikrommyd I wanted Andres to look into this issue before you closed it.

Yeah yeah all good. I just didn't know that transferring was possible :)