ddf.hvplot.line with datashade=True throws AttributeError: 'tuple' object has no attribute 'iloc' in the datashader dask library

[N4321D]

Example:

import dask.dataframe as dd
import pandas as pd
import numpy as np

import hvplot.dask

ddf = pd.from_pandas(pd.DataFrame({"a": np.random.random(100000)}), n_partitions=4)

ddf.a.hvplot.line(datashade=True)

throws this error:

WARNING:param.dynamic_operation: Callable raised "AttributeError("'tuple' object has no attribute 'iloc'")".
Invoked as dynamic_operation(height=300, scale=1.0, width=700, x_range=None, y_range=None)
WARNING:param.dynamic_operation: Callable raised "AttributeError("'tuple' object has no attribute 'iloc'")".
Invoked as dynamic_operation(height=300, scale=1.0, width=700, x_range=None, y_range=None)
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
File [/usr/local/lib/python3.12/site-packages/IPython/core/formatters.py:977](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/IPython/core/formatters.py#line=976), in MimeBundleFormatter.__call__(self, obj, include, exclude)
    974     method = get_real_method(obj, self.print_method)
    976     if method is not None:
--> 977         return method(include=include, exclude=exclude)
    978     return None
    979 else:

File [/usr/local/lib/python3.12/site-packages/holoviews/core/dimension.py:1286](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/dimension.py#line=1285), in Dimensioned._repr_mimebundle_(self, include, exclude)
   1279 def _repr_mimebundle_(self, include=None, exclude=None):
   1280     """
   1281     Resolves the class hierarchy for the class rendering the
   1282     object using any display hooks registered on Store.display
   1283     hooks.  The output of all registered display_hooks is then
   1284     combined and returned.
   1285     """
-> 1286     return Store.render(self)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/options.py:1428](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/options.py#line=1427), in Store.render(cls, obj)
   1426 data, metadata = {}, {}
   1427 for hook in hooks:
-> 1428     ret = hook(obj)
   1429     if ret is None:
   1430         continue

File [/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:287](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py#line=286), in pprint_display(obj)
    285 if not ip.display_formatter.formatters['text[/plain](http://127.0.0.1:8888/plain)'].pprint:
    286     return None
--> 287 return display(obj, raw_output=True)

File [/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:261](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py#line=260), in display(obj, raw_output, **kwargs)
    259 elif isinstance(obj, (HoloMap, DynamicMap)):
    260     with option_state(obj):
--> 261         output = map_display(obj)
    262 elif isinstance(obj, Plot):
    263     output = render(obj)

File [/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:149](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py#line=148), in display_hook.<locals>.wrapped(element)
    147 try:
    148     max_frames = OutputSettings.options['max_frames']
--> 149     mimebundle = fn(element, max_frames=max_frames)
    150     if mimebundle is None:
    151         return {}, {}

File [/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:209](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py#line=208), in map_display(vmap, max_frames)
    206     max_frame_warning(max_frames)
    207     return None
--> 209 return render(vmap)

File [/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py:76](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/ipython/display_hooks.py#line=75), in render(obj, **kwargs)
     73 if renderer.fig == 'pdf':
     74     renderer = renderer.instance(fig='png')
---> 76 return renderer.components(obj, **kwargs)

File [/usr/local/lib/python3.12/site-packages/holoviews/plotting/renderer.py:396](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/plotting/renderer.py#line=395), in Renderer.components(self, obj, fmt, comm, **kwargs)
    393 embed = (not (dynamic or streams or self.widget_mode == 'live') or config.embed)
    395 if embed or config.comms == 'default':
--> 396     return self._render_panel(plot, embed, comm)
    397 return self._render_ipywidget(plot)

File [/usr/local/lib/python3.12/site-packages/holoviews/plotting/renderer.py:403](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/plotting/renderer.py#line=402), in Renderer._render_panel(self, plot, embed, comm)
    401 doc = Document()
    402 with config.set(embed=embed):
--> 403     model = plot.layout._render_model(doc, comm)
    404 if embed:
    405     return render_model(model, comm)

File [/usr/local/lib/python3.12/site-packages/panel/viewable.py:736](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/panel/viewable.py#line=735), in Viewable._render_model(self, doc, comm)
    734 if comm is None:
    735     comm = state._comm_manager.get_server_comm()
--> 736 model = self.get_root(doc, comm)
    738 if self._design and self._design.theme.bokeh_theme:
    739     doc.theme = self._design.theme.bokeh_theme

File [/usr/local/lib/python3.12/site-packages/panel/layout/base.py:320](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/panel/layout/base.py#line=319), in Panel.get_root(self, doc, comm, preprocess)
    316 def get_root(
    317     self, doc: Optional[Document] = None, comm: Optional[Comm] = None,
    318     preprocess: bool = True
    319 ) -> Model:
--> 320     root = super().get_root(doc, comm, preprocess)
    321     # ALERT: Find a better way to handle this
    322     if hasattr(root, 'styles') and 'overflow-x' in root.styles:

File [/usr/local/lib/python3.12/site-packages/panel/viewable.py:667](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/panel/viewable.py#line=666), in Renderable.get_root(self, doc, comm, preprocess)
    665 wrapper = self._design._wrapper(self)
    666 if wrapper is self:
--> 667     root = self._get_model(doc, comm=comm)
    668     if preprocess:
    669         self._preprocess(root)

File [/usr/local/lib/python3.12/site-packages/panel/layout/base.py:186](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/panel/layout/base.py#line=185), in Panel._get_model(self, doc, root, parent, comm)
    184 root = root or model
    185 self._models[root.ref['id']] = (model, parent)
--> 186 objects, _ = self._get_objects(model, [], doc, root, comm)
    187 props = self._get_properties(doc)
    188 props[self._property_mapping['objects']] = objects

File [/usr/local/lib/python3.12/site-packages/panel/layout/base.py:168](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/panel/layout/base.py#line=167), in Panel._get_objects(self, model, old_objects, doc, root, comm)
    166 else:
    167     try:
--> 168         child = pane._get_model(doc, root, model, comm)
    169     except RerenderError as e:
    170         if e.layout is not None and e.layout is not self:

File [/usr/local/lib/python3.12/site-packages/panel/pane/holoviews.py:429](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/panel/pane/holoviews.py#line=428), in HoloViews._get_model(self, doc, root, parent, comm)
    427     plot = self.object
    428 else:
--> 429     plot = self._render(doc, comm, root)
    431 plot.pane = self
    432 backend = plot.renderer.backend

File [/usr/local/lib/python3.12/site-packages/panel/pane/holoviews.py:525](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/panel/pane/holoviews.py#line=524), in HoloViews._render(self, doc, comm, root)
    522     if comm:
    523         kwargs['comm'] = comm
--> 525 return renderer.get_plot(self.object, **kwargs)

File [/usr/local/lib/python3.12/site-packages/holoviews/plotting/bokeh/renderer.py:68](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/plotting/bokeh/renderer.py#line=67), in BokehRenderer.get_plot(self_or_cls, obj, doc, renderer, **kwargs)
     61 @bothmethod
     62 def get_plot(self_or_cls, obj, doc=None, renderer=None, **kwargs):
     63     """
     64     Given a HoloViews Viewable return a corresponding plot instance.
     65     Allows supplying a document attach the plot to, useful when
     66     combining the bokeh model with another plot.
     67     """
---> 68     plot = super().get_plot(obj, doc, renderer, **kwargs)
     69     if plot.document is None:
     70         plot.document = Document() if self_or_cls.notebook_context else curdoc()

File [/usr/local/lib/python3.12/site-packages/holoviews/plotting/renderer.py:217](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/plotting/renderer.py#line=216), in Renderer.get_plot(self_or_cls, obj, doc, renderer, comm, **kwargs)
    214     raise SkipRendering(msg.format(dims=dims))
    216 # Initialize DynamicMaps with first data item
--> 217 initialize_dynamic(obj)
    219 if not renderer:
    220     renderer = self_or_cls

File [/usr/local/lib/python3.12/site-packages/holoviews/plotting/util.py:270](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/plotting/util.py#line=269), in initialize_dynamic(obj)
    268     continue
    269 if not len(dmap):
--> 270     dmap[dmap._initial_key()]

File [/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py:1217](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py#line=1216), in DynamicMap.__getitem__(self, key)
   1215 # Not a cross product and nothing cached so compute element.
   1216 if cache is not None: return cache
-> 1217 val = self._execute_callback(*tuple_key)
   1218 if data_slice:
   1219     val = self._dataslice(val, data_slice)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py:984](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py#line=983), in DynamicMap._execute_callback(self, *args)
    981     kwargs['_memoization_hash_'] = hash_items
    983 with dynamicmap_memoization(self.callback, self.streams):
--> 984     retval = self.callback(*args, **kwargs)
    985 return self._style(retval)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py:582](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py#line=581), in Callable.__call__(self, *args, **kwargs)
    579     args, kwargs = (), dict(pos_kwargs, **kwargs)
    581 try:
--> 582     ret = self.callable(*args, **kwargs)
    583 except KeyError:
    584     # KeyError is caught separately because it is used to signal
    585     # invalid keys on DynamicMap and should not warn
    586     raise

File [/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py:1037](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py#line=1036), in Dynamic._dynamic_operation.<locals>.dynamic_operation(*key, **kwargs)
   1036 def dynamic_operation(*key, **kwargs):
-> 1037     key, obj = resolve(key, kwargs)
   1038     return apply(obj, *key, **kwargs)

File [/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py:1026](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py#line=1025), in Dynamic._dynamic_operation.<locals>.resolve(key, kwargs)
   1024 elif isinstance(map_obj, DynamicMap) and map_obj._posarg_keys and not key:
   1025     key = tuple(kwargs[k] for k in map_obj._posarg_keys)
-> 1026 return key, map_obj[key]

File [/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py:1217](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py#line=1216), in DynamicMap.__getitem__(self, key)
   1215 # Not a cross product and nothing cached so compute element.
   1216 if cache is not None: return cache
-> 1217 val = self._execute_callback(*tuple_key)
   1218 if data_slice:
   1219     val = self._dataslice(val, data_slice)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py:984](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py#line=983), in DynamicMap._execute_callback(self, *args)
    981     kwargs['_memoization_hash_'] = hash_items
    983 with dynamicmap_memoization(self.callback, self.streams):
--> 984     retval = self.callback(*args, **kwargs)
    985 return self._style(retval)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py:582](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/spaces.py#line=581), in Callable.__call__(self, *args, **kwargs)
    579     args, kwargs = (), dict(pos_kwargs, **kwargs)
    581 try:
--> 582     ret = self.callable(*args, **kwargs)
    583 except KeyError:
    584     # KeyError is caught separately because it is used to signal
    585     # invalid keys on DynamicMap and should not warn
    586     raise

File [/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py:1038](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py#line=1037), in Dynamic._dynamic_operation.<locals>.dynamic_operation(*key, **kwargs)
   1036 def dynamic_operation(*key, **kwargs):
   1037     key, obj = resolve(key, kwargs)
-> 1038     return apply(obj, *key, **kwargs)

File [/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py:1030](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py#line=1029), in Dynamic._dynamic_operation.<locals>.apply(element, *key, **kwargs)
   1028 def apply(element, *key, **kwargs):
   1029     kwargs = dict(util.resolve_dependent_kwargs(self.p.kwargs), **kwargs)
-> 1030     processed = self._process(element, key, kwargs)
   1031     if (self.p.link_dataset and isinstance(element, Dataset) and
   1032         isinstance(processed, Dataset) and processed._dataset is None):
   1033         processed._dataset = element.dataset

File [/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py:1012](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/util/__init__.py#line=1011), in Dynamic._process(self, element, key, kwargs)
   1010 elif isinstance(self.p.operation, Operation):
   1011     kwargs = {k: v for k, v in kwargs.items() if k in self.p.operation.param}
-> 1012     return self.p.operation.process_element(element, key, **kwargs)
   1013 else:
   1014     return self.p.operation(element, **kwargs)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/operation.py:194](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/operation.py#line=193), in Operation.process_element(self, element, key, **params)
    191 else:
    192     self.p = param.ParamOverrides(self, params,
    193                                   allow_extra_keywords=self._allow_extra_keywords)
--> 194 return self._apply(element, key)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/operation.py:141](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/operation.py#line=140), in Operation._apply(self, element, key)
    139     if not in_method:
    140         element._in_method = True
--> 141 ret = self._process(element, key)
    142 if hasattr(element, '_in_method') and not in_method:
    143     element._in_method = in_method

File [/usr/local/lib/python3.12/site-packages/holoviews/operation/datashader.py:1527](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/operation/datashader.py#line=1526), in datashade._process(self, element, key)
   1526 def _process(self, element, key=None):
-> 1527     agg = rasterize._process(self, element, key)
   1528     shaded = shade._process(self, agg, key)
   1529     return shaded

File [/usr/local/lib/python3.12/site-packages/holoviews/operation/datashader.py:1506](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/operation/datashader.py#line=1505), in rasterize._process(self, element, key)
   1503     op = transform.instance(**{k:v for k,v in extended_kws.items()
   1504                                if k in transform.param})
   1505     op._precomputed = self._precomputed
-> 1506     element = element.map(op, predicate)
   1507     self._precomputed = op._precomputed
   1509 unused_params = list(all_supplied_kws - all_allowed_kws)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/data/__init__.py:196](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/data/__init__.py#line=195), in PipelineMeta.pipelined.<locals>.pipelined_fn(*args, **kwargs)
    193     inst._in_method = True
    195 try:
--> 196     result = method_fn(*args, **kwargs)
    197     if PipelineMeta.disable:
    198         return result

File [/usr/local/lib/python3.12/site-packages/holoviews/core/data/__init__.py:1213](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/data/__init__.py#line=1212), in Dataset.map(self, *args, **kwargs)
   1211 @wraps(LabelledData.map)
   1212 def map(self, *args, **kwargs):
-> 1213     return super().map(*args, **kwargs)

File [/usr/local/lib/python3.12/site-packages/holoviews/core/dimension.py:697](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/dimension.py#line=696), in LabelledData.map(self, map_fn, specs, clone)
    695     return deep_mapped
    696 else:
--> 697     return map_fn(self) if applies else self

File [/usr/local/lib/python3.12/site-packages/holoviews/core/operation.py:214](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/operation.py#line=213), in Operation.__call__(self, element, **kwargs)
    210         return element.clone([(k, self._apply(el, key=k))
    211                               for k, el in element.items()])
    212     elif ((self._per_element and isinstance(element, Element)) or
    213           (not self._per_element and isinstance(element, ViewableElement))):
--> 214         return self._apply(element)
    215 elif 'streams' not in kwargs:
    216     kwargs['streams'] = self.p.streams

File [/usr/local/lib/python3.12/site-packages/holoviews/core/operation.py:141](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/core/operation.py#line=140), in Operation._apply(self, element, key)
    139     if not in_method:
    140         element._in_method = True
--> 141 ret = self._process(element, key)
    142 if hasattr(element, '_in_method') and not in_method:
    143     element._in_method = in_method

File [/usr/local/lib/python3.12/site-packages/holoviews/operation/datashader.py:394](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/operation/datashader.py#line=393), in aggregate._process(self, element, key)
    392     params["vdims"] = [*params["vdims"], *sel_vdims]
    393 else:
--> 394     agg = self._apply_datashader(dfdata, cvs_fn, agg_fn, agg_kwargs, x, y)
    396 if 'x_axis' in agg.coords and 'y_axis' in agg.coords:
    397     agg = agg.rename({'x_axis': x, 'y_axis': y})

File [/usr/local/lib/python3.12/site-packages/holoviews/operation/datashader.py:419](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/holoviews/operation/datashader.py#line=418), in aggregate._apply_datashader(self, dfdata, cvs_fn, agg_fn, agg_kwargs, x, y)
    414 with warnings.catch_warnings():
    415     warnings.filterwarnings(
    416         action='ignore', message='casting datetime64',
    417         category=FutureWarning
    418     )
--> 419     agg = cvs_fn(dfdata, x.name, y.name, agg_fn, **agg_kwargs)
    421 is_where_index = ds15 and isinstance(agg_fn, ds.where) and isinstance(agg_fn.column, rd.SpecialColumn)
    422 is_summary_index = isinstance(agg_fn, ds.summary) and "index" in agg

File [/usr/local/lib/python3.12/site-packages/datashader/core.py:472](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/datashader/core.py#line=471), in Canvas.line(self, source, x, y, agg, axis, geometry, line_width, antialias)
    464     if not isinstance(non_cat_agg, (
    465         rd.any, rd.count, rd.max, rd.min, rd.sum, rd.summary, rd._sum_zero,
    466         rd._first_or_last, rd.mean, rd.max_n, rd.min_n, rd._first_n_or_last_n,
    467         rd._max_or_min_row_index, rd._max_n_or_min_n_row_index, rd.where,
    468     )):
    469         raise NotImplementedError(
    470             f"{type(non_cat_agg)} reduction not implemented for antialiased lines")
--> 472 return bypixel(source, self, glyph, agg, antialias=glyph.antialiased)

File [/usr/local/lib/python3.12/site-packages/datashader/core.py:1335](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/datashader/core.py#line=1334), in bypixel(source, canvas, glyph, agg, antialias)
   1333 with warnings.catch_warnings():
   1334     warnings.filterwarnings('ignore', r'All-NaN (slice|axis) encountered')
-> 1335     return bypixel.pipeline(source, schema, canvas, glyph, agg, antialias=antialias)

File [/usr/local/lib/python3.12/site-packages/datashader/utils.py:114](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/datashader/utils.py#line=113), in Dispatcher.__call__(self, head, *rest, **kwargs)
    112 typ = type(head)
    113 if typ in lk:
--> 114     return lk[typ](head, *rest, **kwargs)
    115 for cls in getmro(typ)[1:]:
    116     if cls in lk:

File [/usr/local/lib/python3.12/site-packages/datashader/data_libraries/dask.py:35](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/datashader/data_libraries/dask.py#line=34), in dask_pipeline(df, schema, canvas, glyph, summary, antialias, cuda)
     32 graph = df.__dask_graph__()
     34 dsk.update(optimize(graph, keys))
---> 35 return scheduler(dsk, name)

File [/usr/local/lib/python3.12/site-packages/dask/threaded.py:90](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/dask/threaded.py#line=89), in get(dsk, keys, cache, num_workers, pool, **kwargs)
     87     elif isinstance(pool, multiprocessing.pool.Pool):
     88         pool = MultiprocessingPoolExecutor(pool)
---> 90 results = get_async(
     91     pool.submit,
     92     pool._max_workers,
     93     dsk,
     94     keys,
     95     cache=cache,
     96     get_id=_thread_get_id,
     97     pack_exception=pack_exception,
     98     **kwargs,
     99 )
    101 # Cleanup pools associated to dead threads
    102 with pools_lock:

File [/usr/local/lib/python3.12/site-packages/dask/local.py:512](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/dask/local.py#line=511), in get_async(submit, num_workers, dsk, result, cache, get_id, rerun_exceptions_locally, pack_exception, raise_exception, callbacks, dumps, loads, chunksize, **kwargs)
    510         _execute_task(task, data)  # Re-execute locally
    511     else:
--> 512         raise_exception(exc, tb)
    513 res, worker_id = loads(res_info)
    514 state["cache"][key] = res

File [/usr/local/lib/python3.12/site-packages/dask/local.py:320](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/dask/local.py#line=319), in reraise(exc, tb)
    318 if exc.__traceback__ is not tb:
    319     raise exc.with_traceback(tb)
--> 320 raise exc

File [/usr/local/lib/python3.12/site-packages/dask/local.py:225](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/dask/local.py#line=224), in execute_task(key, task_info, dumps, loads, get_id, pack_exception)
    223 try:
    224     task, data = loads(task_info)
--> 225     result = _execute_task(task, data)
    226     id = get_id()
    227     result = dumps((result, id))

File [/usr/local/lib/python3.12/site-packages/dask/core.py:127](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/dask/core.py#line=126), in _execute_task(arg, cache, dsk)
    123     func, args = arg[0], arg[1:]
    124     # Note: Don't assign the subtask results to a variable. numpy detects
    125     # temporaries by their reference count and can execute certain
    126     # operations in-place.
--> 127     return func(*(_execute_task(a, cache) for a in args))
    128 elif not ishashable(arg):
    129     return arg

File [/usr/local/lib/python3.12/site-packages/datashader/data_libraries/dask.py:229](http://127.0.0.1:8888/usr/local/lib/python3.12/site-packages/datashader/data_libraries/dask.py#line=228), in line.<locals>.chunk(df, df2)
    227 plot_start = True
    228 if df2 is not None:
--> 229     df = concat([df.iloc[-1:], df2])
    230     plot_start = False
    231 aggs = create(shape)

AttributeError: 'tuple' object has no attribute 'iloc'
:DynamicMap   []

VERSIONS: OS: debian bookworm pip list:

Package                   Version
------------------------- --------------
anyio                     4.3.0
argon2-cffi               23.1.0
argon2-cffi-bindings      21.2.0
arrow                     1.3.0
asciitree                 0.3.3
asttokens                 2.4.1
async-lru                 2.0.4
attrs                     23.2.0
Babel                     2.15.0
beautifulsoup4            4.12.3
black                     24.4.2
bleach                    6.1.0
bokeh                     3.4.1
certifi                   2024.2.2
cffi                      1.16.0
chardet                   5.2.0
charset-normalizer        3.3.2
click                     8.1.7
cloudpickle               3.0.0
colorama                  0.4.6
colorcet                  3.1.0
comm                      0.2.2
contourpy                 1.2.1
cycler                    0.12.1
daal                      2024.4.0
daal4py                   2024.4.0
dask                      2024.5.0
dask-expr                 1.1.0
dask-glm                  0.3.2
dask-ml                   2024.4.4
datashader                0.16.1
debugpy                   1.8.1
decorator                 5.1.1
defusedxml                0.7.1
distributed               2024.5.0
executing                 2.0.1
fasteners                 0.19
fastjsonschema            2.19.1
fonttools                 4.51.0
fqdn                      1.5.1
fsspec                    2024.3.1
geckodriver               0.0.1
gitdb                     4.0.11
GitPython                 3.1.43
h11                       0.14.0
holoviews                 1.18.3
httpcore                  1.0.5
httpx                     0.27.0
hvplot                    0.10.0
idna                      3.7
ipykernel                 6.29.4
ipython                   8.24.0
ipywidgets                8.1.2
isoduration               20.11.0
isort                     5.13.2
jedi                      0.19.1
Jinja2                    3.1.4
joblib                    1.4.2
json5                     0.9.25
jsonpointer               2.4
jsonschema                4.22.0
jsonschema-specifications 2023.12.1
jupyter_bokeh             4.0.4
jupyter_client            8.6.1
jupyter_core              5.7.2
jupyter-events            0.10.0
jupyter-lsp               2.2.5
jupyter_server            2.14.0
jupyter-server-mathjax    0.2.6
jupyter_server_terminals  0.5.3
jupyterlab                4.2.0
jupyterlab_code_formatter 2.2.1
jupyterlab_darkside_theme 0.1.2
jupyterlab_git            0.50.0
jupyterlab_pygments       0.3.0
jupyterlab_server         2.27.1
jupyterlab_widgets        3.0.10
kiwisolver                1.4.5
linkify-it-py             2.0.3
llvmlite                  0.42.0
locket                    1.0.0
Markdown                  3.6
markdown-it-py            3.0.0
MarkupSafe                2.1.5
matplotlib                3.8.4
matplotlib-inline         0.1.7
mdit-py-plugins           0.4.1
mdurl                     0.1.2
mistune                   3.0.2
msgpack                   1.0.8
multipledispatch          1.0.0
mypy-extensions           1.0.0
nbclient                  0.10.0
nbconvert                 7.16.4
nbdime                    4.0.1
nbformat                  5.10.4
nest-asyncio              1.6.0
notebook_shim             0.2.4
numba                     0.59.1
numcodecs                 0.12.1
numpy                     1.26.4
outcome                   1.3.0.post0
overrides                 7.7.0
packaging                 24.0
pandas                    2.2.2
pandas-flavor             0.6.0
pandocfilters             1.5.1
panel                     1.4.2
param                     2.1.0
parso                     0.8.4
partd                     1.4.2
pathspec                  0.12.1
patsy                     0.5.6
pexpect                   4.9.0
pillow                    10.3.0
pingouin                  0.5.4
pip                       24.0
platformdirs              4.2.1
plotly                    5.22.0
prometheus_client         0.20.0
prompt-toolkit            3.0.43
psutil                    5.9.8
ptyprocess                0.7.0
pure-eval                 0.2.2
pyarrow                   16.1.0
pycparser                 2.22
pyct                      0.5.0
pydot                     2.0.0
Pygments                  2.18.0
pyparsing                 3.1.2
PySocks                   1.7.1
python-dateutil           2.9.0.post0
python-json-logger        2.0.7
pytz                      2024.1
pyviz_comms               3.0.2
PyYAML                    6.0.1
pyzmq                     26.0.3
referencing               0.35.1
requests                  2.31.0
rfc3339-validator         0.1.4
rfc3986-validator         0.1.1
rpds-py                   0.18.1
scikit-learn              1.4.2
scikit-learn-intelex      2024.4.0
scipy                     1.13.0
seaborn                   0.13.2
selenium                  4.20.0
Send2Trash                1.8.3
setuptools                69.5.1
six                       1.16.0
smmap                     5.0.1
sniffio                   1.3.1
sortedcontainers          2.4.0
soupsieve                 2.5
sparse                    0.15.1
stack-data                0.6.3
statsmodels               0.14.2
tabulate                  0.9.0
tbb                       2021.12.0
tblib                     3.0.0
tenacity                  8.3.0
terminado                 0.18.1
threadpoolctl             3.5.0
tinycss2                  1.3.0
toolz                     0.12.1
tornado                   6.4
tqdm                      4.66.4
traitlets                 5.14.3
trio                      0.25.0
trio-websocket            0.11.1
types-python-dateutil     2.9.0.20240316
typing_extensions         4.11.0
tzdata                    2024.1
uc-micro-py               1.0.3
uri-template              1.3.0
urllib3                   2.2.1
wcwidth                   0.2.13
webcolors                 1.13
webencodings              0.5.1
websocket-client          1.8.0
wheel                     0.43.0
widgetsnbextension        4.0.10
wsproto                   1.2.0
xarray                    2024.5.0
xyzservices               2024.4.0
zarr                      2.18.0

[hoxbro]

This is related to dask_expr being enabled by default. As a workaround, you can run dask config set dataframe.query-planning false, which will restore the original behavior.

[N4321D]

thank you that worked

[hoxbro]

MRE in datashader:

import dask
import pandas as pd
import numpy as np

dask.config.set(**{"dataframe.query-planning": True})

import datashader as ds
import dask.dataframe as dd

ddf = dd.from_pandas(pd.DataFrame({"x": np.arange(100_000), "y": np.random.random(100000)}), npartitions=2)
cvs = ds.Canvas(plot_width=300, plot_height=300)
cvs.line(ddf.x.reset_index(), x='index', y='x')