okumin opened a new pull request, #5492: URL: https://github.com/apache/hive/pull/5492
### What changes were proposed in this pull request? This PR would limit the maximum number of table scan operators which SWO tries to merge. https://issues.apache.org/jira/browse/HIVE-28549 ### Why are the changes needed? We observed SWO makes a negative impact when it merges too many, e.g. 50, operators. If operators are memory intensive, they might throw OOM or might slow down. I believe we can resolve OOM with the following patch, but we still want an upper limit so that we can tune concurrency or RAM per operator reasonably. https://github.com/apache/hive/pull/5478 ### Does this PR introduce _any_ user-facing change? No. ### Is the change a dependency upgrade? No. ### How was this patch tested? I added a qtest -- 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: gitbox-unsubscr...@hive.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org
