[jira] [Created] (ARROW-13784) PyArrow from_arrays should return a schema when array is empty but names is not

["Abderrahmane Jaidi (Jira)" <ji...@apache.org>]

Abderrahmane Jaidi created ARROW-13784:
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             Summary: PyArrow from_arrays should return a schema when array is empty but names is not
                 Key: ARROW-13784
                 URL: https://issues.apache.org/jira/browse/ARROW-13784
             Project: Apache Arrow
          Issue Type: Bug
          Components: Python
    Affects Versions: 4.0.1
            Reporter: Abderrahmane Jaidi


The `Table.from_arrays` method returns an empty schema when supplying an empty arrays list but providing column names. As a result, the subsequent `to_pandas` method returns an empty data frame with no column names.

```

{{import pyarrow as pa}}

{{arrays = []}}

{{cols_names = ["col1", "col2"]}}

{{table = pa.Table.from_arrays(arrays=arrays, names=cols_names)}}

{{table.schema  # returns nothing}}

{{df = table.to_pandas()}}

{{df.head()}}

{{Empty DataFrame
Columns: []
Index: [] # Expected column names to be visible here}}

```

I assume that this is because a schema cannot be built without data types?



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