maropu commented on pull request #28575: URL: https://github.com/apache/spark/pull/28575#issuecomment-631312585
IIRC we had some activities (not merged though) for CNF normalization, e.g., SPARK-6624 and SPARK-17357 (https://github.com/apache/spark/pull/15558). I'm not sure about why they stopped halfway though, supporting it for optimization (like the other DBMS systems such as PgSQL) sounds nice. But, I think we should implement it in a general way rather than adding it in each rule like this PR. cc: @viirya @cloud-fan ---------------------------------------------------------------- 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]
