[GitHub] [arrow] westonpace commented on issue #34067: [Python] pyarrow.dataset.write_dataset does not store fields metadata

["westonpace (via GitHub)" <gi...@apache.org>]

westonpace commented on issue #34067:
URL: https://github.com/apache/arrow/issues/34067#issuecomment-1421002849

   No, there is no good reason for this.  If the input is a table then the dataset writer should be able to retain the field metadata.
   
   The `WriteDataset` API is very generic at the moment.  It takes, as input, a scanner.  That scanner can add new columns or remove columns.  So we can't just grab the input schema.  Today we just grab the schema metadata instead.
   
   We can change the write node to accept a schema, that shouldn't be too difficult. Then perhaps we can create an overload for `FileSystemDataset::Write` that accepts a table as input instead of a scanner.


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