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From "Namit Jain (JIRA)" <>
Subject [jira] Commented: (HIVE-287) count distinct on multiple columns does not work
Date Tue, 25 May 2010 19:28:25 GMT


Namit Jain commented on HIVE-287:

I am sorry about 1 and 3 - you can ignore those.

2. It would be a good idea to maintain some compatibility for the existing interface - so,
can we add another method to UDAFResolver, which has the new API - and a common class which
invokes the default implementation, that would be better.

Here is what I understand your suggestion as: Add a new method to GenericUDAFResolver interface
maintaining the old method. Create an abstract base class that implements the new interface
method and invokes the old method by dropping isDistinct/isAllColumn arguments. Extend the
current resolvers to override this method. Will this address your concern? If not, can you
provide a concrete example.

-- yes

> count distinct on multiple columns does not work
> ------------------------------------------------
>                 Key: HIVE-287
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Namit Jain
>            Assignee: Arvind Prabhakar
>             Fix For: 0.6.0
>         Attachments: HIVE-287-1.patch
> The following query does not work:
> select count(distinct col1, col2) from Tbl

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