PNDSPY1040¶

Message Pandas < pandas.core.frame.DataFrame.backfill > has a partial mapping with a few scenarios not supported in Snowpark.

Category Warning

Applies to¶

This EWI applies to the following elements (same implementation):

pandas.core.frame.DataFrame.backfill
pandas.core.generic.NDFrame.backfill
pandas.core.series.Series.backfill

Description¶

This issue appears when the SMA detects the use of a pandas element that has a direct equivalent in Snowpark pandas, but some scenarios might behave differently than pandas.

Reason: N if param downcast is set.

Scenario¶

A method with a few scenarios that aren’t supported in Snowpark.

Input¶

The following example shows a method with a few unsupported scenarios in Snowpark.

import pandas as pd

df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
result = df.backfill()

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Output¶

The SMA adds the EWI PNDSPY1040 to the output code to let you know that this element has a few scenarios that aren’t supported in Snowpark.

import snowflake.snowpark.modin.pandas as pd

#EWI: PNDSPY1040 => pandas.core.frame.DataFrame.backfill has a partial mapping, with few scenarios not supported. Check Snowpark pandas documentation for more detail.
df = pd.DataFrame({'A': [1, 2, 3], 'B': [4, 5, 6]})
result = df.backfill()

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Recommended fix¶

Behavioral note: N if param downcast is set.

This behavior may differ from native pandas. Recommended actions:

Test with a representative sample of your data
Compare results with native pandas if precision is critical
Use .to_pandas() if exact pandas behavior is required

Additional recommendations¶

Check the Snowpark pandas documentation to verify which scenarios aren’t supported for that specific element.