ayushtkn opened a new pull request, #3142: URL: https://github.com/apache/hive/pull/3142
After https://issues.apache.org/jira/browse/HIVE-23530 , almost all compute stats functions are vectorizable. Only function that is not vectorizable is "compute_bit_vector" for ndv statistics computation. This causes "create table as select" and "insert overwrite select" queries to run in non-vectorized mode. Even a very naive implementation of vectorized compute_bit_vector gives about 50% performance improvement on simple "insert overwrite select" queries. That is because entire mapper or reducer can run in vectorized mode. -- 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]
