clintropolis commented on PR #19004: URL: https://github.com/apache/druid/pull/19004#issuecomment-3881665177
>In some of our environments we observed a significant query performance regression after upgrading to Druid 29.0. This regression appears to be related to the virtual column bitmap indexing optimization introduced in https://github.com/apache/druid/pull/15585 and https://github.com/apache/druid/pull/15633. have you tried in versions newer than 29? #15838 was in 30, and #17055/#17125 in 31, which should make it so that expression indexes are only used in cases where there would be less work to do than a full scan (which has to compute the expression value and perform the match for every 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. 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]
