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From "Rahul Challapalli (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DRILL-5252) A condition returns always true
Date Thu, 30 Mar 2017 22:58:41 GMT

    [ https://issues.apache.org/jira/browse/DRILL-5252?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15950024#comment-15950024
] 

Rahul Challapalli commented on DRILL-5252:
------------------------------------------

When I ran the below query on 1.9.0, I cannot reproduce the issue. Its clear that I am not
hitting that code path. Otherwise, drill would have returned all the records. However my expectation
is that the left side is a typed null constant and the right side is a logical expression
which is also a typed null constant.

{code}
select * from cp.`tpch/region.parquet` where cast(null as int) = cast(null as int) + 5;
+--------------+---------+------------+
| r_regionkey  | r_name  | r_comment  |
+--------------+---------+------------+
+--------------+---------+------------+
{code}

> A condition returns always true
> -------------------------------
>
>                 Key: DRILL-5252
>                 URL: https://issues.apache.org/jira/browse/DRILL-5252
>             Project: Apache Drill
>          Issue Type: Bug
>            Reporter: JC
>            Priority: Minor
>              Labels: ready-to-commit
>             Fix For: 1.10.0
>
>
> I've found the following code smell in recent github snapshot.
> Path: exec/java-exec/src/main/java/org/apache/drill/exec/expr/EqualityVisitor.java
> {code:java}
> 287 
> 288   @Override
> 289   public Boolean visitNullConstant(TypedNullConstant e, LogicalExpression value)
throws RuntimeException {
> 290     if (!(value instanceof TypedNullConstant)) {
> 291       return false;
> 292     }
> 293     return e.getMajorType().equals(e.getMajorType());
> 294   }
> 295
> {code}
> Should it be like this?
> {code:java}
> 292     }
> 293     return value.getMajorType().equals(e.getMajorType());
> 294   }
> {code}



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