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Description
Describe the bug
Steps/Code to reproduce bug
In cudf_polars/tests/experimental/test_groupby:
def test_groupby_agg_empty(df: pl.LazyFrame, engine: pl.GPUEngine) -> None:
q = df.group_by("y").agg()
assert_gpu_result_equal(q, engine=engine, check_row_order=False)
That fails with
________________________________________________________________________________________________________________________________________________________________________________________________________ test_groupby_agg_empty _________________________________________________________________________________________________________________________________________________________________________________________________________
Traceback (most recent call last):
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/_pytest/runner.py", line 341, in from_call
result: Optional[TResult] = func()
^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/_pytest/runner.py", line 262, in <lambda>
lambda: ihook(item=item, **kwds), when=when, reraise=reraise
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_hooks.py", line 513, in __call__
return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_manager.py", line 120, in _hookexec
return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_callers.py", line 182, in _multicall
return outcome.get_result()
^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_result.py", line 100, in get_result
raise exc.with_traceback(exc.__traceback__)
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_callers.py", line 103, in _multicall
res = hook_impl.function(*args)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/_pytest/runner.py", line 177, in pytest_runtest_call
raise e
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/_pytest/runner.py", line 169, in pytest_runtest_call
item.runtest()
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/_pytest/python.py", line 1792, in runtest
self.ihook.pytest_pyfunc_call(pyfuncitem=self)
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_hooks.py", line 513, in __call__
return self._hookexec(self.name, self._hookimpls.copy(), kwargs, firstresult)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_manager.py", line 120, in _hookexec
return self._inner_hookexec(hook_name, methods, kwargs, firstresult)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_callers.py", line 139, in _multicall
raise exception.with_traceback(exception.__traceback__)
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/pluggy/_callers.py", line 103, in _multicall
res = hook_impl.function(*args)
^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/_pytest/python.py", line 194, in pytest_pyfunc_call
result = testfunction(**testargs)
^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/cudf/python/cudf_polars/tests/experimental/test_groupby.py", line 133, in test_groupby_agg_empty
assert_gpu_result_equal(q, engine=engine, check_row_order=False)
File "/home/coder/cudf/python/cudf_polars/cudf_polars/testing/asserts.py", line 99, in assert_gpu_result_equal
got = lazydf.collect(**final_cudf_collect_kwargs, engine=engine)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/coder/.conda/envs/rapids/lib/python3.12/site-packages/polars/lazyframe/frame.py", line 2066, in collect
return wrap_df(ldf.collect(callback))
^^^^^^^^^^^^^^^^^^^^^
polars.exceptions.ComputeError: ValueError: not enough values to unpack (expected 3, got 0)
======================================================================================================================================================================================================== short test summary info ========================================================================================================================================================================================================
FAILED tests/experimental/test_groupby.py::test_groupby_agg_empty - polars.exceptions.ComputeError: ValueError: not enough values to unpack (expected 3, got 0)Expected behavior
In [4]: df.group_by("y").agg().collect()
Out[4]:
shape: (3, 1)
┌─────┐
│ y │
│ --- │
│ i64 │
╞═════╡
│ 2 │
│ 3 │
│ 1 │
└─────┘
Environment overview (please complete the following information)
- Environment location: Bare-metal
- Method of cuDF install: from source
Environment details
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