[IMPALA-1390] Partitioned agg node returns incorrect results with ASAN build.

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: Impala 2.0
• Fix Version/s: Impala 2.1
• Assignee: Ippokratis Pandis
• Reporter: Alexander Behm
• Created: 15/Oct/14 23:07
• Updated: 11/Nov/14 07:14
• Resolved: 11/Nov/14 07:14

Description

Consider this query from our test suite (top-n.test):

select c1, c3, m2
from (
       select c1, c3, max(c2) m2
       from (
              select c1, c2, c3
              from (
                     select int_col c1, tinyint_col c2, max(id) c3
                     from functional.alltypessmall
                     group by 1, 2
                     order by 1,2
                     limit 5
                   ) x
             ) x2
       group by c1, c3
       limit 10
     ) t
where c1 > 0
order by 2, 1 desc
limit 3

The expected results are:

+----+----+----+
| c1 | c3 | m2 |
+----+----+----+
| 1  | 96 | 1  |
| 2  | 97 | 2  |
| 3  | 98 | 3  |
+----+----+----+

When building ASAN and enabling partitioned aggregation the results are:

+----+----+----+
| c1 | c3 | m2 |
+----+----+----+
| 4  | 99 | 4  |
+----+----+----+

When building ASAN and disabling partitioned aggregation the results are correct.