ulysses-you commented on pull request #26875: URL: https://github.com/apache/spark/pull/26875#issuecomment-647899052
The positive test case (test1, test2) is to confirm this pr has much better performance in dynamic like scene. The test1 and test2 aim to check the different string length. `%2` has no meaning. The negative test case (test3) is to confirm this pr has little performance regression. > Why is test1 and test3 so different in time? Since it's a join opt, the best way is using the column which is at right of like as the `BufferedSide`, then when loop `StreamSide`, the `BufferedSide` column will always same as last, so it can avoid pattern compile each row. ---------------------------------------------------------------- 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]
