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Matt McCline updated HIVE-12369: -------------------------------- Attachment: HIVE-12369.0995.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 > > > 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} -- This message was sent by Atlassian JIRA (v7.6.3#76005)