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https://issues.apache.org/jira/browse/HIVE-9618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Navis updated HIVE-9618:
------------------------
Status: Patch Available (was: Open)
Rebased to trunk
> Deduplicate RS keys for ptf/windowing
> -------------------------------------
>
> Key: HIVE-9618
> URL: https://issues.apache.org/jira/browse/HIVE-9618
> Project: Hive
> Issue Type: Improvement
> Components: PTF-Windowing
> Reporter: Navis
> Assignee: Navis
> Priority: Trivial
> Attachments: HIVE-9618.1.patch.txt, HIVE-9618.2.patch.txt,
> HIVE-9618.3.patch.txt
>
>
> Currently, partition spec containing same column for partition-by and
> order-by makes duplicated key column for RS. For example,
> {noformat}
> explain
> select p_mfgr, p_name, p_size,
> rank() over (partition by p_mfgr order by p_name) as r,
> dense_rank() over (partition by p_mfgr order by p_name) as dr,
> sum(p_retailprice) over (partition by p_mfgr order by p_name rows between
> unbounded preceding and current row) as s1
> from noop(on noopwithmap(on noop(on part
> partition by p_mfgr
> order by p_mfgr, p_name
> )))
> {noformat}
> "partition by p_mfgr order by p_mfgr, p_name" makes duplicated key columns
> like below
> {noformat}
> Reduce Output Operator
> key expressions: p_mfgr (type: string), p_mfgr (type: string), p_name
> (type: string)
> sort order: +++
> Map-reduce partition columns: p_mfgr (type: string)
> value expressions: p_size (type: int), p_retailprice (type: double)
> {noformat}
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