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https://issues.apache.org/jira/browse/HIVE-13733?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15280202#comment-15280202
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Mahens commented on HIVE-13733:
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let me check If hive.cbo.enable = true will resolve this issue.
> 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
> Assignee: Jesus Camacho Rodriguez
>
> 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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