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The problems is that the pivots[col] = -pivots[col]
on Mars backend: It assigns without any exceptions, but the data is not updated to pivots. The following p_records = pivots.to_records(index=False) get incorrect p_records.
on Ray backend: Ray mark the numpy array returns from Ray object store as immutable. So, this line raises a clear exception.
fyrestone
changed the title
[BUG] Mars dataframe psrs bug on pandas<1.4
[BUG] Mars dataframe sort_values with multiple ascendings returns incorrect result on pandas<1.4
Aug 26, 2022
Describe the bug
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Example
Mars backend
Ray DAG backend
The problems is that the
pivots[col] = -pivots[col]
p_records = pivots.to_records(index=False)
get incorrectp_records
.Related issues:
ray-project/ray#369
pandas-dev/pandas#43406
This bug has fixed in
pandas >= 1.4
.To Reproduce
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Expected behavior
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Additional context
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