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Posted to gitbox@hive.apache.org by GitBox <gi...@apache.org> on 2022/07/24 14:11:43 UTC
[GitHub] [hive] ayushtkn opened a new pull request, #3142: HIVE-26072: Enable vectorization for stats gathering (tablescan op).
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.
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[GitHub] [hive] github-actions[bot] closed pull request #3142: HIVE-26072: Enable vectorization for stats gathering (tablescan op).
Posted by GitBox <gi...@apache.org>.
github-actions[bot] closed pull request #3142: HIVE-26072: Enable vectorization for stats gathering (tablescan op).
URL: https://github.com/apache/hive/pull/3142
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[GitHub] [hive] github-actions[bot] closed pull request #3142: HIVE-26072: Enable vectorization for stats gathering (tablescan op).
Posted by GitBox <gi...@apache.org>.
github-actions[bot] closed pull request #3142: HIVE-26072: Enable vectorization for stats gathering (tablescan op).
URL: https://github.com/apache/hive/pull/3142
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[GitHub] [hive] github-actions[bot] commented on pull request #3142: HIVE-26072: Enable vectorization for stats gathering (tablescan op).
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on PR #3142:
URL: https://github.com/apache/hive/pull/3142#issuecomment-1287961074
This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
Feel free to reach out on the dev@hive.apache.org list if the patch is in need of reviews.
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[GitHub] [hive] github-actions[bot] commented on pull request #3142: HIVE-26072: Enable vectorization for stats gathering (tablescan op).
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on PR #3142:
URL: https://github.com/apache/hive/pull/3142#issuecomment-1162489092
This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
Feel free to reach out on the dev@hive.apache.org list if the patch is in need of reviews.
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