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Date: Thu, 5 Jun 2014 06:19:02 +0000 (UTC)
From: "Yibing Shi (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
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Subject: [jira] [Created] (HIVE-7178) Table alias cannot be used in GROUPING
 SETS clause if there are more than one column in it
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Yibing Shi created HIVE-7178:
--------------------------------

             Summary: Table alias cannot be used in GROUPING SETS clause if there are more than one column in it
                 Key: HIVE-7178
                 URL: https://issues.apache.org/jira/browse/HIVE-7178
             Project: Hive
          Issue Type: Bug
          Components: SQL
    Affects Versions: 0.13.0
            Reporter: Yibing Shi


The following SQL doesn't work: 
EXPLAIN 
SELECT alias.a, alias.b, alias.c, COUNT(DISTINCT d) 
FROM table_name alias 
GROUP BY alias.a, alias.b, alias.c 
GROUPING SETS( (alias.a), (alias.b, alias.a) ); 
FAILED: ParseException line 15:34 missing ) at ',' near '<EOF>' 
line 16:0 extraneous input ')' expecting EOF near '<EOF>' 

The following SQL works (without alias in grouping set): 
EXPLAIN 
SELECT a, b, c, COUNT(DISTINCT d) 
FROM table_name 
GROUP BY a, b, c 
GROUPING SETS( (a), (b, a) ); 

Alias works for just one column: 
EXPLAIN 
SELECT alias.a, alias.b, alias.c, COUNT(DISTINCT d) 
FROM table_name alias 
GROUP BY alias.a, alias.b, alias.c 
GROUPING SETS( (alias.a) ); 

Using alias in GROUPING SETS could be very useful if multiple tables are involved in the SELECT (via JOIN)



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