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Cannot convert empty datafusion dataframe to pandas #234

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simicd opened this issue Feb 25, 2023 · 0 comments · Fixed by #236
Closed

Cannot convert empty datafusion dataframe to pandas #234

simicd opened this issue Feb 25, 2023 · 0 comments · Fixed by #236
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simicd commented Feb 25, 2023

Describe the bug
The previously introduced to_pandas() dataframe method works only if there are 1 or more record batches. If a datafusion dataframe is empty the method will return an error instead of an empty pandas DataFrame. This error was raised by @krzysztof-kwitt in #197

To Reproduce
df.limit(0).to_pandas() fails with an error.

Expected behavior
Empty pandas dataframe

Additional context
Fix: Pass record batch schema into the arrow Table class resolves this issue.
@simicd simicd added the bug Something isn't working label Feb 25, 2023
This was referenced Feb 25, 2023
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feature: Additional export methods simicd/arrow-datafusion-python
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