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Posted to issues@hive.apache.org by "Matt McCline (JIRA)" <ji...@apache.org> on 2018/10/02 18:51:00 UTC
[jira] [Updated] (HIVE-12369) Native Vector GroupBy
[ https://issues.apache.org/jira/browse/HIVE-12369?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Matt McCline updated HIVE-12369:
--------------------------------
Attachment: HIVE-12369.0996.patch
> Native Vector GroupBy
> ---------------------
>
> Key: HIVE-12369
> URL: https://issues.apache.org/jira/browse/HIVE-12369
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Reporter: Matt McCline
> Assignee: Matt McCline
> Priority: Critical
> Attachments: HIVE-12369.01.patch, HIVE-12369.02.patch, HIVE-12369.05.patch, HIVE-12369.06.patch, HIVE-12369.091.patch, HIVE-12369.094.patch, HIVE-12369.095.patch, HIVE-12369.096.patch, HIVE-12369.097.patch, HIVE-12369.098.patch, HIVE-12369.099.patch, HIVE-12369.0991.patch, HIVE-12369.0992.patch, HIVE-12369.0993.patch, HIVE-12369.0994.patch, HIVE-12369.0995.patch, HIVE-12369.0996.patch
>
>
> Implement Native Vector GroupBy using fast hash table technology developed for Native Vector MapJoin, etc.
> Patch is currently limited to a single COUNT aggregation. Or, no aggregation also known as duplicate reduction.
> Here are examples of new kinds of classes introduces that stored the count in the slot table and don't allocate hash elements:
> {noformat}
> COUNT(column) VectorGroupByHashLongKeySingleCountColumnOperator
> COUNT(key) VectorGroupByHashLongKeySingleCountKeyOperator
> COUNT(*) VectorGroupByHashLongKeySingleCountStarOperator
> {noformat}
> And the duplicate reduction operator a single key. Example:
> {noformat}
> VectorGroupByHashLongKeyDuplicateReductionOperator
> {noformat}
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