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https://issues.apache.org/jira/browse/HIVE-287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12871310#action_12871310
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Namit Jain commented on HIVE-287:
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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: https://issues.apache.org/jira/browse/HIVE-287
> 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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