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Posted to dev@drill.apache.org by "Volodymyr Vysotskyi (JIRA)" <ji...@apache.org> on 2019/03/15 07:07:00 UTC
[jira] [Resolved] (DRILL-5683) Incorrect query result when query
uses NOT(IS NOT NULL) expression
[ https://issues.apache.org/jira/browse/DRILL-5683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Volodymyr Vysotskyi resolved DRILL-5683.
----------------------------------------
Resolution: Fixed
Fix Version/s: 1.16.0
Fixed in DRILL-6524
> Incorrect query result when query uses NOT(IS NOT NULL) expression
> -------------------------------------------------------------------
>
> Key: DRILL-5683
> URL: https://issues.apache.org/jira/browse/DRILL-5683
> Project: Apache Drill
> Issue Type: Bug
> Reporter: Jinfeng Ni
> Assignee: Volodymyr Vysotskyi
> Priority: Major
> Fix For: 1.16.0
>
>
> The following repo was modified from a testcase provided by Arjun Rajan(arajan@mapr.com).
> 1. Prepare dataset with null.
> {code}
> create table dfs.tmp.t1 as
> select r_regionkey, r_name, case when mod(r_regionkey, 3) > 0 then mod(r_regionkey, 3) else null end as flag
> from cp.`tpch/region.parquet`;
> select * from dfs.tmp.t1;
> +--------------+--------------+-------+
> | r_regionkey | r_name | flag |
> +--------------+--------------+-------+
> | 0 | AFRICA | null |
> | 1 | AMERICA | 1 |
> | 2 | ASIA | 2 |
> | 3 | EUROPE | null |
> | 4 | MIDDLE EAST | 1 |
> +--------------+--------------+-------+
> {code}
> 2. Query with NOT(IS NOT NULL) expression in the filter.
> {code}
> select * from dfs.tmp.t1 where NOT (flag IS NOT NULL);
> +--------------+---------+-------+
> | r_regionkey | r_name | flag |
> +--------------+---------+-------+
> | 0 | AFRICA | null |
> | 3 | EUROPE | null |
> +--------------+---------+-------+
> {code}
> 3. Switch run-time code compiler from default to 'JDK', and get wrong result.
> {code}
> alter system set `exec.java_compiler` = 'JDK';
> +-------+------------------------------+
> | ok | summary |
> +-------+------------------------------+
> | true | exec.java_compiler updated. |
> +-------+------------------------------+
> select * from dfs.tmp.t1 where NOT (flag IS NOT NULL);
> +--------------+--------------+-------+
> | r_regionkey | r_name | flag |
> +--------------+--------------+-------+
> | 0 | AFRICA | null |
> | 1 | AMERICA | 1 |
> | 2 | ASIA | 2 |
> | 3 | EUROPE | null |
> | 4 | MIDDLE EAST | 1 |
> +--------------+--------------+-------+
> {code}
> 4. Wrong result could happen too, when NOT(IS NOT NULL) in Project operator.
> {code}
> select r_regionkey, r_name, NOT(flag IS NOT NULL) as exp1 from dfs.tmp.t1;
> +--------------+--------------+-------+
> | r_regionkey | r_name | exp1 |
> +--------------+--------------+-------+
> | 0 | AFRICA | true |
> | 1 | AMERICA | true |
> | 2 | ASIA | true |
> | 3 | EUROPE | true |
> | 4 | MIDDLE EAST | true |
> +--------------+--------------+-------+
> {code}
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