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From "Ashutosh Chauhan (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-13452) StatsOptimizer should return no rows on empty table with group by
Date Thu, 07 Apr 2016 02:09:25 GMT
Ashutosh Chauhan created HIVE-13452:
---------------------------------------

             Summary: StatsOptimizer should return no rows on empty table with group by
                 Key: HIVE-13452
                 URL: https://issues.apache.org/jira/browse/HIVE-13452
             Project: Hive
          Issue Type: Bug
          Components: Logical Optimizer
            Reporter: Ashutosh Chauhan


{code}
create table t1 (a int);
analyze table t1 compute statistics;
analyze table t1 compute statistics for columns;
select count(1) from t1 group by 1;
set hive.compute.query.using.stats=true;
select count(1) from t1 group by 1;
{code}

In both cases result set should be empty. However, with statsoptimizer on Hive returns one
row with value 0.



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