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

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Pending Closed
• Affects Version/s: 0.9.0
• Fix Version/s: 1.0.0
• Component/s: Query Planning & Optimization
• Assignee: Sean Hsuan-Yi Chu
• Reporter: Abhishek Girish
• Created: 04/Mar/15 03:49
• Updated: 22/Aug/16 03:17
• Resolved: 14/May/15 18:44

Description

The following query returns null :

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)

Removing the GROUP BY returns correct results:

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)

Issue Links

• depends upon: DRILL-2207 Fix Union All Operator
• depends upon: DRILL-2376 UNION ALL on Aggregates with GROUP BY returns incomplete results
• is related to: DRILL-2376 UNION ALL on Aggregates with GROUP BY returns incomplete results