kasakrisz opened a new pull request #1734: URL: https://github.com/apache/hive/pull/1734
### What changes were proposed in this pull request? Introduce a new HiveConf setting to set lower bound of hash aggregation reduction. The default value is 0.5. During query compilation hash aggregation reduction is adjusted by calculating its effectiveness. With this patch if the adjusted reduction value is less than the configured lower bound the lower bound value will be used. ### Why are the changes needed? Some cases we end up with 0 values forcing the Group by operator to skip Hash aggregates and chooses streaming mode. ### Does this PR introduce _any_ user-facing change? No. ### How was this patch tested? ---------------------------------------------------------------- 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]
