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https://issues.apache.org/jira/browse/HIVE-474?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12923602#action_12923602
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Namit Jain commented on HIVE-474:
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1. add initEvaluators() in Operator.java instead of ReduceSinkOperator.java
2. ReduceSinkDesc: use numKeys and getNumKeys() or change numKeys to
numDistributionKeys -
You may run into problems with serialization/deserialization
3. Add some comments in initEvaluatorsAndReturnStruct in ReduceSinkOperator
-- explain that it is same as parent in case of no union for groupby
4. Can you more comments in GroupByOperator and SemanticAnalyzer also ?
It looks OK, but it will help if there are more comments.
> Support for distinct selection on two or more columns
> -----------------------------------------------------
>
> Key: HIVE-474
> URL: https://issues.apache.org/jira/browse/HIVE-474
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Alexis Rondeau
> Assignee: Amareshwari Sriramadasu
> Attachments: hive-474.0.4.2rc.patch, 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 user
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