Marco Neumann created ARROW-1083:
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Summary: Object categoricals are not serialized when only None is
present
Key: ARROW-1083
URL: https://issues.apache.org/jira/browse/ARROW-1083
Project: Apache Arrow
Issue Type: Bug
Components: Python
Affects Versions: 0.4.0
Reporter: Marco Neumann
Priority: Minor
The following code sample fails with {{pyarrow.lib.ArrowNotImplementedError:
NotImplemented: unhandled type}} but should not:
{noformat}
import pandas as pd
import pyarrow as pa
import pyarrow.parquet as pq
df = pd.DataFrame({'x': [None]})
df['x'] = df['x'].astype('category')
table = pa.Table.from_pandas(df)
buf = pa.InMemoryOutputStream()
pq.write_table(table, buf)
{noformat}
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