Matt McCline created HIVE-7518:
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Summary: Output of vectorized GROUP BY aggregate fields like AVG
as columns so downstream operators 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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