cloud-fan commented on pull request #35290: URL: https://github.com/apache/spark/pull/35290#issuecomment-1035914450
> My point is when you do select a from (select a, a union select a, b), it will not fail but produce unexpected result. Are you sure this won't fail? I thought the output column names of Union are the same with its first child, so `select a` should fail because the name is ambiguous. -- 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]
