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dropna() fails with AttributeError when using dask expr

dropna() fails with AttributeError when using dask expr: a task in harbor-swesmith-rl-artifacts: Harbor SWE-Smith 强化学习数据产物 (Harbor dataset). When trying to use the dropna() method on a DataFrame with dask expr, it fails with an AttributeError.

The task

When trying to use the `dropna()` method on a DataFrame with dask_expr, it fails with an AttributeError.

Part of keryszhan/harbor-swesmith-rl-artifacts.