Shengsheng Huang created HIVE-3199:
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Summary: 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
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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