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https://issues.apache.org/jira/browse/HIVE-287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12870789#action_12870789
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Namit Jain commented on HIVE-287:
---------------------------------
Overall looks good, some minor comments:
1. This should be independent of COUNT - so, all basically all aggregation
functions should be supported with DISTINCT.
For eg: select avg(distinct c1,c2) from T
and so on.
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.
3. Follows from 1 - more tests are needed
> 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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