pitrou commented on pull request #10289:
URL: https://github.com/apache/arrow/pull/10289#issuecomment-839631978
I'm not even sure what field_ids are supposed to be for. The parquet spec
only has this to say:
```thrift
/** When the original schema supports field ids, this will save the
* original field id in the parquet schema
*/
9: optional i32 field_id;
```
I suppose "original schema" means something non-Parquet, but what? Is it
just some kind of arbitrary application-defined id?
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