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From "Matt McCline (JIRA)" <j...@apache.org>
Subject [jira] [Reopened] (HIVE-7518) Output vectorized GROUP BY aggregate fields from STRUCTs for AVG, etc as columns so downstream reduce can be vectorized
Date Sat, 14 May 2016 11:24:12 GMT

     [ https://issues.apache.org/jira/browse/HIVE-7518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Matt McCline reopened HIVE-7518:
--------------------------------

> Output vectorized GROUP BY aggregate fields from STRUCTs for AVG, etc as columns so downstream
reduce can be vectorized
> -----------------------------------------------------------------------------------------------------------------------
>
>                 Key: HIVE-7518
>                 URL: https://issues.apache.org/jira/browse/HIVE-7518
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Matt McCline
>            Assignee: Matt McCline
>
> Today, aggregates like AVG are output from VectorGroupByOperator as a STRUCT.  This prevents
downstream operators in map, reduce shuffle, and reduce from being vectorized.
> Take the STRUCT fields used for AVG (for example) and output them (vector) columns.
> NOTE: downstream VectorGroupByOperator needs to accept column form…
> •	That is, (reduce) merge of partial aggregates is different than map.



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