liukun4515 commented on issue #1342: URL: https://github.com/apache/arrow-datafusion/issues/1342#issuecomment-974648662
> ote this optimization is only valid prior to any OUTER joins The idea is from [is null optimize](https://dev.mysql.com/doc/refman/8.0/en/is-null-optimization.html). I think the `is null` optimization has no side effect if the column has `not null` constraint. But the `is not null` optimization should be checked with more cases, I will do it in the followup pull request. -- 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]
