[jira] [Work started] (HIVE-14027) NULL values produced by left outer join do not behave as NULL

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

     [ https://issues.apache.org/jira/browse/HIVE-14027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HIVE-14027 started by Jesus Camacho Rodriguez.
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> NULL values produced by left outer join do not behave as NULL
> -------------------------------------------------------------
>
>                 Key: HIVE-14027
>                 URL: https://issues.apache.org/jira/browse/HIVE-14027
>             Project: Hive
>          Issue Type: Bug
>          Components: Query Processor
>    Affects Versions: 1.2.1, 2.2.0
>            Reporter: Vaibhav Gumashta
>            Assignee: Jesus Camacho Rodriguez
>         Attachments: HIVE-14027.01.patch, HIVE-14027.02.patch, HIVE-14027.patch
>
>
> Consider the following setup:
> {code}
> create table tbl (n bigint, t string); 
> insert into tbl values (1, 'one'); 
> insert into tbl values(2, 'two');
> select a.n, a.t, isnull(b.n), isnull(b.t) from (select * from tbl where n = 1) a  left outer join  (select * from tbl where 1 = 2) b on a.n = b.n;
> 1    one    false    true
> {code}
> The query should return true for isnull(b.n).
> I've tested by inserting a row with null value for the bigint column into tbl, and isnull returns true in that case. 



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