zabetak opened a new pull request #1926: URL: https://github.com/apache/hive/pull/1926
### What changes were proposed in this pull request? Update estimations for group by operator to take into account the largest NDV among the columns participating in the aggregation. ### Why are the changes needed? Improve accuracy of statistics. ### Does this PR introduce _any_ user-facing change? May result in plan changes. ### How was this patch tested? ``` mvn -pl itests/qtest -Pqsplits -Pitests test -Dtest=TestMiniLlapLocalCliDriver -Dtest.output.overwrite mvn -pl itests/qtest -Pqsplits -Pitests test -Dtest=TestTezTPCDS30TBPerfCliDriver -Dtest.output.overwrite ``` ---------------------------------------------------------------- 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: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: gitbox-unsubscr...@hive.apache.org For additional commands, e-mail: gitbox-h...@hive.apache.org
