[jira] [Updated] (HIVE-22666) Introduce TopNKey operator for PTF Reduce Sink

["Krisztian Kasa (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-22666?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Krisztian Kasa updated HIVE-22666:
----------------------------------
    Description: 
{code}
EXPLAIN EXTENDED
SELECT s_state, ranking
FROM (
 SELECT s_state AS s_state,
 rank() OVER (PARTITION BY s_state ORDER BY ss_net_profit) AS ranking
 FROM testtable_n1000) tmp1
 WHERE ranking <= 3;
{code}

In this case the topN value (3) will be pushed to the ReduceSink operator
https://github.com/apache/hive/blob/520aa19b20381bfd2ed25c835443c013f6e6ebb9/ql/src/java/org/apache/hadoop/hive/ql/ppd/OpProcFactory.java#L257

ReduceSink operator uses PTFTopNHash to get the topN rows for each partition key (s_state) value.

The goal of this jira is:
- implement supporting partitioning in TopNKeyOperator
- enable push down of partitioned TopNKeyOperator


> Introduce TopNKey operator for PTF Reduce Sink
> ----------------------------------------------
>
>                 Key: HIVE-22666
>                 URL: https://issues.apache.org/jira/browse/HIVE-22666
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Krisztian Kasa
>            Priority: Major
>
> {code}
> EXPLAIN EXTENDED
> SELECT s_state, ranking
> FROM (
>  SELECT s_state AS s_state,
>  rank() OVER (PARTITION BY s_state ORDER BY ss_net_profit) AS ranking
>  FROM testtable_n1000) tmp1
>  WHERE ranking <= 3;
> {code}
> In this case the topN value (3) will be pushed to the ReduceSink operator
> https://github.com/apache/hive/blob/520aa19b20381bfd2ed25c835443c013f6e6ebb9/ql/src/java/org/apache/hadoop/hive/ql/ppd/OpProcFactory.java#L257
> ReduceSink operator uses PTFTopNHash to get the topN rows for each partition key (s_state) value.
> The goal of this jira is:
> - implement supporting partitioning in TopNKeyOperator
> - enable push down of partitioned TopNKeyOperator



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