[jira] [Created] (DRILL-2377) UNION ALL on Aggregates with GROUP BY returns null when column aliases don't match

["Abhishek Girish (JIRA)" <ji...@apache.org>]

Abhishek Girish created DRILL-2377:
--------------------------------------

             Summary: UNION ALL on Aggregates with GROUP BY returns null when column aliases don't match
                 Key: DRILL-2377
                 URL: https://issues.apache.org/jira/browse/DRILL-2377
             Project: Apache Drill
          Issue Type: Bug
          Components: Query Planning & Optimization
    Affects Versions: 0.8.0
            Reporter: Abhishek Girish
            Assignee: Jinfeng Ni


The following query returns null :
{code:sql}
select x
from
(SELECT Sum(ss_ext_sales_price) x
FROM  store_sales
UNION ALL
SELECT Sum(cs_ext_sales_price) y
FROM catalog_sales) tmp
GROUP BY x;

Results from Drill:
+------------+
|     x      |
+------------+
| null       |
+------------+
1 row selected (3.458 seconds)

Results from Postgres:
       x       
---------------
 3658019159.35
 5265207074.51
(2 rows)
{code}

Removing the GROUP BY returns correct results:
{code:sql}
select x
from
(SELECT Sum(ss_ext_sales_price) x
FROM  store_sales
UNION ALL
SELECT Sum(cs_ext_sales_price) y
FROM catalog_sales) tmp

Results from Drill:
+------------+
|     x      |
+------------+
| 5265207074.51 |
| 3658019159.35 |
+------------+
2 rows selected (3.46 seconds)
{code}



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