Support Date32 type with Polars #476
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…d supports Date32. Convert polars to pyarrow.
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This PR was motivated by vega/altair#3280. This same PyArrow cropped up when using VegaFusion with a Polars DataFrame containing a Date32 column. This PR adds a simple PyArrowDatasource that bypasses the DataFrame Interchange protocol, and this Date32 error. Then it converts Polars to PyArrow and uses this data source. The Polars docs say this is mostly a zero-cost conversion.