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https://issues.apache.org/jira/browse/HIVE-7518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matt McCline reopened HIVE-7518:
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> 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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