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https://issues.apache.org/jira/browse/HIVE-287?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12886950#action_12886950
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Arvind Prabhakar commented on HIVE-287:
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bq. 1. Change the comments for the 2 new fields. It's easy for UDAF writers to
assume that the UDAF itself needs to handle whether it's distinct or whether
it's all columns.
I updated the javadocs in various places to make this clear.
bq. 2. Deprecate the old interface, and move all existing GenericUDAF to
inherit from the new one.
No changes necessary for this - the previously submitted patch also did it. All
existing generic UDAFs now extend from the abstract class that implements the
new interface. If you see any problems with that let me know.
> 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
> Attachments: HIVE-287-1.patch, HIVE-287-2.patch, HIVE-287-3.patch,
> HIVE-287-4.patch, HIVE-287-5-branch-0.6.patch, HIVE-287-5-trunk.patch,
> HIVE-287-6-branch-0.6.patch, HIVE-287-6-trunk.patch
>
>
> The following query does not work:
> select count(distinct col1, col2) from Tbl
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