Comments (2)
fpbeekhof1977
commented on September 24, 2024
The issue does not appear when creating the dataset directly in py-arrow.
However, it does happen when converting a dataframe to pyarrow and then using pyarrow's parquet.write_to_dataset method.
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fpbeekhof1977
commented on September 24, 2024
The reason is that polars' ".to_arrow()" converts "str" columns to pyarrow's "large_string" rather than "string".
The partitions are correctly written if the pyarrow type is "string" rather than "large_string".
SOLUTION: "to_arrow()" should map columns of type "str" onto pyarrow's "string", not "large_string".
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