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https://issues.apache.org/jira/browse/HIVE-13735?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15329349#comment-15329349
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Rajesh Balamohan commented on HIVE-13735:
-----------------------------------------
Thanks [~Takuma] - I have updated the assignee.
> Query involving only partition columns need not launch mr/tez job
> -----------------------------------------------------------------
>
> Key: HIVE-13735
> URL: https://issues.apache.org/jira/browse/HIVE-13735
> Project: Hive
> Issue Type: Bug
> Reporter: Rajesh Balamohan
> Assignee: Takuma Wakamori
>
> codebase: hive master
> dataset: tpc-ds 10 TB scale
> e.g queries:
> {noformat}
> hive> show partitions web_sales;
> ...
> ...
> Time taken: 0.13 seconds, Fetched: 1824 row(s)
> hive> select distinct ws_sold_date_sk from web_sales;
> ----------------------------------------------------------------------------------------------
> VERTICES MODE STATUS TOTAL COMPLETED RUNNING PENDING
> FAILED KILLED
> ----------------------------------------------------------------------------------------------
> Map 1 .......... container SUCCEEDED 1 1 0 0
> 0 0
> Reducer 2 ...... container SUCCEEDED 1 1 0 0
> 0 0
> ----------------------------------------------------------------------------------------------
> VERTICES: 02/02 [==========================>>] 100% ELAPSED TIME: 2.70 s
> ----------------------------------------------------------------------------------------------
> Status: DAG finished successfully in 2.70 seconds
> ..
> Time taken: 3.964 seconds, Fetched: 1824 row(s)
> hive> select distinct ws_sold_date_sk from web_sales order by ws_sold_date_sk;
> ----------------------------------------------------------------------------------------------
> VERTICES MODE STATUS TOTAL COMPLETED RUNNING PENDING
> FAILED KILLED
> ----------------------------------------------------------------------------------------------
> Map 1 .......... container SUCCEEDED 801 801 0 0
> 0 0
> Reducer 2 ...... container SUCCEEDED 1 1 0 0
> 0 0
> Reducer 3 ...... container SUCCEEDED 1 1 0 0
> 0 0
> ----------------------------------------------------------------------------------------------
> VERTICES: 03/03 [==========================>>] 100% ELAPSED TIME: 23.05 s
> ----------------------------------------------------------------------------------------------
> Status: DAG finished successfully in 23.05 seconds
> ...
> Time taken: 27.095 seconds, Fetched: 1824 row(s)
> {noformat}
> since the info is already available in metastore, it might not need to launch
> these jobs.
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