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https://issues.apache.org/jira/browse/HIVE-3199?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shengsheng Huang updated HIVE-3199:
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Attachment: HIVE-3199.for0.9.0.patch
Uploaded a patch to enable basic "select distinct *" (patterns like "select
distinct * from t", "select distinct t.* from t" or "select distinct * from a
join b" are all supported) This patch does not support subqueries - That means
"select distinct *" can not be contained in subqueries, or the "from" clause is
a subquery.
> support select distinct *
> -------------------------
>
> Key: HIVE-3199
> URL: https://issues.apache.org/jira/browse/HIVE-3199
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor
> Affects Versions: 0.9.0
> Reporter: Shengsheng Huang
> Attachments: HIVE-3199.for0.9.0.patch
>
>
> Error is reported when running query "select distinct * from t".
> It is a common feature that is better to be supported.
> Did some investigation about this issue. In current implementation "select
> distinct a,b,c from t" is translated to "select a,b,c from t group by a,b,c".
> So select distinct * is translated literally to "select * from group by *".
> But * is not handled properly when processing groupby expressions.
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