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From "Vihang Karajgaonkar (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-18421) Vectorized execution does not handle integer overflows
Date Wed, 10 Jan 2018 03:00:16 GMT
Vihang Karajgaonkar created HIVE-18421:
------------------------------------------

             Summary: Vectorized execution does not handle integer overflows
                 Key: HIVE-18421
                 URL: https://issues.apache.org/jira/browse/HIVE-18421
             Project: Hive
          Issue Type: Bug
          Components: Vectorization
    Affects Versions: 2.3.2, 2.2.0, 2.1.1, 3.0.0
            Reporter: Vihang Karajgaonkar
            Assignee: Vihang Karajgaonkar


In vectorized execution arithmetic operations which cause integer overflows can give wrong
results. Issue is reproducible in both Orc and parquet.

Simple test case to reproduce this issue

{noformat}
set hive.vectorized.execution.enabled=true;
create table parquettable (t1 tinyint, t2 tinyint) stored as parquet;
insert into parquettable values (-104, 25), (-112, 24), (54, 9);
select t1, t2, (t1-t2) as diff from parquettable where (t1-t2) < 50 order by diff desc;
+-------+-----+-------+
|  t1   | t2  | diff  |
+-------+-----+-------+
| -104  | 25  | 127   |
| -112  | 24  | 120   |
| 54    | 9   | 45    |
+-------+-----+-------+
{noformat}

When vectorization is turned off the same query produces only one row.



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