[jira] [Commented] (HIVE-13733) CTE + "IS NULL" predicate + column aliasing as existing column leads to wrong results

["Jesus Camacho Rodriguez (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-13733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280100#comment-15280100 ] 

Jesus Camacho Rodriguez commented on HIVE-13733:
------------------------------------------------

This is reproducible in master when {{hive.cbo.enable=false}}.

> CTE + "IS NULL" predicate + column aliasing as existing column leads to wrong results 
> --------------------------------------------------------------------------------------
>
>                 Key: HIVE-13733
>                 URL: https://issues.apache.org/jira/browse/HIVE-13733
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 1.1.0
>            Reporter: Dudu Markovitz
>
> hive> create table t (i int,a string,b string);
> hive> insert into t values (1,'hello','world'),(2,'bye',null);
> hive> select * from t where t.b is null;
> 2	bye	NULL
> This is wrong, all 3 columns should return the same value - t.a.
> hive> with cte as (select t.a as a,t.a as b,t.a as c from t where t.b is null) select * from cte;
> bye	NULL	bye
> However, these are right:
> hive> select t.a as a,t.a as b,t.a as c from t where t.b is null;
> bye	bye	bye
> hive> with cte as (select t.a as a,t.a as b,t.a as c from t where t.b is not null) select * from cte;OK
> hello	hello	hello



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