wgtmac commented on PR #41769:
URL: https://github.com/apache/arrow/pull/41769#issuecomment-2123855905

   > This fixing looks nice to me, but I'm a bit confused why 
`schema.metadata()` is extracted to file-metadata, @wgtmac do you know the 
context here?
   
   I found this from https://github.com/apache/arrow/pull/5077:
   ```
   Add ArrowWriterProperties::store_schema() option which stores the Arrow 
schema used to create a Parquet file in a special ARROW:schema key in the 
metadata, so that we can detect that a column was originally DictionaryArray. 
This option is off by default, but enabled in the Python bindings. We can 
always make it the default in the future
   ```


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