cloud-fan commented on pull request #28326: URL: https://github.com/apache/spark/pull/28326#issuecomment-619769222
Seems we don't have any rule for column metadata propagation. Each `Attribute`/`Alias` has its own metadata and can easily be hidden by the outer-most `Alias`. The only "propagation" I know is in `Column.name`, where we keep the column metadata when adding a new `Alias`. We need a more clear rule about how to propagate column metadata. ---------------------------------------------------------------- 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. For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
