[jira] [Commented] (HIVE-4109) Partition by column does not have to be in order by

["Ashutosh Chauhan (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-4109?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13591549#comment-13591549 ] 

Ashutosh Chauhan commented on HIVE-4109:
----------------------------------------

[~rhbutani] Yeah.. I wasn't sure either about legality of such queries. Thats why I tried it on postgres. Amazingly, they succeeded on postgres. Need to dig more into it.
                
> Partition by column does not have to be in order by
> ---------------------------------------------------
>
>                 Key: HIVE-4109
>                 URL: https://issues.apache.org/jira/browse/HIVE-4109
>             Project: Hive
>          Issue Type: Bug
>          Components: PTF-Windowing
>            Reporter: Brock Noland
>
> Cam up in the review of HIVE-4093.
> Ashutosh
> {noformat}
> I am not sure if this is illegal query. I tried following two queries in postgres, both of them succeeded.
> select p_mfgr, avg(p_retailprice) over(partition by p_mfgr, p_type order by p_mfgr) from part;
> select p_mfgr, avg(p_retailprice) over(partition by p_mfgr order by p_type,p_mfgr) from part;
> {noformat}
> Harish
> {noformat}
> The first one doesn't make sense, right? Order on a subset of the partition columns
> The second one: Can we do this with the Hive ReduceOp have the orderColumns be in a different order than the key columns?
> {noformat}

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