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From "Namit Jain (JIRA)" <>
Subject [jira] Commented: (HIVE-474) Support for distinct selection on two or more columns
Date Mon, 25 Oct 2010 21:00:25 GMT


Namit Jain commented on HIVE-474:

   Not a good idea to ignore skew for multiple distincts.
   It might be safer to throw an error right now in such a scenario - we can add a better
   technique for handling this scenario later.

Can you add a negative testcase for the scenario above ?

Otherwise, it looks good.

> Support for distinct selection on two or more columns
> -----------------------------------------------------
>                 Key: HIVE-474
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Alexis Rondeau
>            Assignee: Amareshwari Sriramadasu
>         Attachments: hive-474.0.4.2rc.patch, patch-474-1.txt, patch-474.txt
> The ability to select distinct several, individual columns as by example: 
> select count(distinct user), count(distinct session) from actions;   
> Currently returns the following failure: 
> FAILED: Error in semantic analysis: line 2:7 DISTINCT on Different Columns not Supported

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