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https://issues.apache.org/jira/browse/HIVE-20265?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vineet Garg reassigned HIVE-20265:
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> PTF operator has an extra reducer in CBO
> ----------------------------------------
>
> Key: HIVE-20265
> URL: https://issues.apache.org/jira/browse/HIVE-20265
> Project: Hive
> Issue Type: Improvement
> Components: Query Planning
> Reporter: Vineet Garg
> Assignee: Vineet Garg
> Priority: Major
>
> {code:sql}
> explain vectorization detail
> select p_mfgr, p_name, p_size,
> min(p_retailprice),
> rank() over(distribute by p_mfgr sort by p_name)as r,
> dense_rank() over(distribute by p_mfgr sort by p_name) as dr,
> p_size, p_size - lag(p_size,1,p_size) over(distribute by p_mfgr sort by
> p_name) as deltaSz
> from part
> group by p_mfgr, p_name, p_size
> {code}
> Above query generates extra reducer with CBO on.
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