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From "Mustafa Iman (Jira)" <j...@apache.org>
Subject [jira] [Assigned] (HIVE-23435) Full outer join result is missing rows
Date Thu, 28 May 2020 05:27:00 GMT

     [ https://issues.apache.org/jira/browse/HIVE-23435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mustafa Iman reassigned HIVE-23435:
-----------------------------------

    Assignee: Mustafa Iman

> Full outer join result is missing rows 
> ---------------------------------------
>
>                 Key: HIVE-23435
>                 URL: https://issues.apache.org/jira/browse/HIVE-23435
>             Project: Hive
>          Issue Type: Bug
>          Components: HiveServer2
>    Affects Versions: 3.1.0
>            Reporter: Naveen Gangam
>            Assignee: Mustafa Iman
>            Priority: Major
>
> Full Outer join result has missing rows. Appears to be a bug with the full outer join
logic. Expected output is receiving when we do a left and right outer join.
> Reproducible steps are mentioned below.
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> SUPPORT ANALYSIS
> Steps to Reproduce:
> 1. Create a table and insert data:
> create table x (z char(5), x int, y int);
> insert into x values ('one', 1, 50),
>  ('two', 2, 30),
>  ('three', 3, 30),
>  ('four', 4, 60),
>  ('five', 5, 70),
>  ('six', 6, 80);
> 2. Try full outer with the below command. The result is incomplete, it is missing the
row:
> NULL NULL NULL three 3 30.0
>  Full Outer Join:
> select x1.`z`, x1.`x`, x1.`y`, x2.`z`,
>  x2.`x`, x2.`y`
>  from `x` x1 full outer join
>  `x` x2 on (x1.`x` > 3) and (x2.`x` < 4) and (x1.`x` =
>  x2.`x`);
> Result:
> ----------------------------------+
> x1.z x1.x x1.y x2.z x2.x x2.y
>  ----------------------------------+
> one 1 50 NULL NULL NULL
>  NULL NULL NULL one 1 50
>  two 2 30 NULL NULL NULL
>  NULL NULL NULL two 2 30
>  three 3 30 NULL NULL NULL
>  four 4 60 NULL NULL NULL
>  NULL NULL NULL four 4 60
>  five 5 70 NULL NULL NULL
>  NULL NULL NULL five 5 70
>  six 6 80 NULL NULL NULL
>  NULL NULL NULL six 6 80
>  ----------------------------------+
> 3. Expected output is coming when we use left/right join + union:
> select x1.`z`, x1.`x`, x1.`y`, x2.`z`,
>  x2.`x`, x2.`y`
>  from `x` x1 left outer join
>  `x` x2 on (x1.`x` > 3) and (x2.`x` < 4) and (x1.`x` =
>  x2.`x`)
>  union
>  select x1.`z`, x1.`x`, x1.`y`, x2.`z`,
>  x2.`x`, x2.`y`
>  from `x` x1 right outer join
>  `x` x2 on (x1.`x` > 3) and (x2.`x` < 4) and (x1.`x` =
>  x2.`x`);
> Result:
> ------------------------------------+
> z x y _col3 _col4 _col5
>  ------------------------------------+
> NULL NULL NULL five 5 70
>  NULL NULL NULL four 4 60
>  NULL NULL NULL one 1 50
>  four 4 60 NULL NULL NULL
>  one 1 50 NULL NULL NULL
>  six 6 80 NULL NULL NULL
>  three 3 30 NULL NULL NULL
>  two 2 30 NULL NULL NULL
>  NULL NULL NULL six 6 80
>  NULL NULL NULL three 3 30
>  NULL NULL NULL two 2 30
>  five 5 70 NULL NULL NULL
>  ------------------------------------+
>  



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