adriangb commented on issue #20135: URL: https://github.com/apache/datafusion/issues/20135#issuecomment-3842912153
> Coincidentally looks like SpiceAI was able to implement file scoped metadata columns (thanks [@lukekim](https://github.com/lukekim) for sharing!) However, I think we should implement these as system/hidden columns and decide visibility + collision policy up front. The issue with this is that we've had trouble deciding what the policy for system / hidden columns should be, how that interacts with joins, etc, which as per linked PRs has failed in the past and may be an invasive change. I do agree this is a better solution though if we can agree on the semantics and the implementation isn't too gnarly. Does `filename(table.col)` resolve the ambiguity? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
