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Reproducible Example

import modin.pandas as pd

df  = pd.DataFrame(dict(col1=[0], col2=[1]))
df.groupby("col1")["col2"].mean()

Issue Description

The implementation assumes "col1" can be copied.

Expected Behavior

We should not make this assumption 😄

Error Logs

Replace this line with the error backtrace (if applicable).

Installed Versions