[jira] [Updated] (HIVE-24957) Wrong results when subquery has COALESCE in correlation predicate

["Stamatis Zampetakis (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-24957?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stamatis Zampetakis updated HIVE-24957:
---------------------------------------
    Description: 
Consider the following example:
{code:sql}
create table author (
    a_authorkey   int,
    a_name varchar(50));

create table book (
    b_bookkey   int,
    b_title varchar(50),
    b_authorkey int);

insert into author values (10, 'Victor Hugo');
insert into author values (20, 'Alexandre Dumas');
insert into author values (300, 'UNKNOWN');

insert into book values (1, 'Les Miserables', 10);
insert into book values (2, 'The Count of Monte Cristo', 20);
insert into book values (3, 'Men Without Women', 30);
insert into book values (4, 'Odyssey', null);

select b.b_title
from book b
where exists
          (select a_authorkey
           from author a
           where coalesce(b.b_authorkey, 300) = a.a_authorkey);
{code}

*Expected results*
||B_TITLE||
|Les Miserables|
|The Count of Monte Cristo|
|Odyssey|

*Actual results*
||B_TITLE||
|Les Miserables|
|The Count of Monte Cristo|

{{Odyssey}} is missing from the result set and it shouldn't since with the application of COALESCE operator it should match with the UNKNOWN author.

  was:
Consider the following example:
{code:sql}
create table author (
    a_authorkey   int,
    a_name varchar(50));

create table book (
    b_bookkey   int,
    b_title varchar(50),
    b_authorkey int);

insert into author values (10, 'Victor Hugo');
insert into author values (20, 'Alexandre Dumas');
insert into author values (300, 'UNKNOWN');

insert into book values (1, 'Les Miserables', 10);
insert into book values (2, 'The Count of Monte Cristo', 20);
insert into book values (3, 'Men Without Women', 30);
insert into book values (4, 'Odyssey', null);

select b.b_title
from book b
where exists
          (select 1
           from author a
           where coalesce(b.b_authorkey, 300) = a.a_authorkey);
{code}

*Expected results*
||B_TITLE||
|Les Miserables|
|The Count of Monte Cristo|
|Odyssey|

*Actual results*
||B_TITLE||
|Les Miserables|
|The Count of Monte Cristo|

{{Odyssey}} is missing from the result set and it shouldn't since with the application of COALESCE operator it should match with the UNKNOWN author.


> Wrong results when subquery has COALESCE in correlation predicate
> -----------------------------------------------------------------
>
>                 Key: HIVE-24957
>                 URL: https://issues.apache.org/jira/browse/HIVE-24957
>             Project: Hive
>          Issue Type: Bug
>    Affects Versions: 4.0.0
>            Reporter: Stamatis Zampetakis
>            Assignee: Stamatis Zampetakis
>            Priority: Major
>
> Consider the following example:
> {code:sql}
> create table author (
>     a_authorkey   int,
>     a_name varchar(50));
> create table book (
>     b_bookkey   int,
>     b_title varchar(50),
>     b_authorkey int);
> insert into author values (10, 'Victor Hugo');
> insert into author values (20, 'Alexandre Dumas');
> insert into author values (300, 'UNKNOWN');
> insert into book values (1, 'Les Miserables', 10);
> insert into book values (2, 'The Count of Monte Cristo', 20);
> insert into book values (3, 'Men Without Women', 30);
> insert into book values (4, 'Odyssey', null);
> select b.b_title
> from book b
> where exists
>           (select a_authorkey
>            from author a
>            where coalesce(b.b_authorkey, 300) = a.a_authorkey);
> {code}
> *Expected results*
> ||B_TITLE||
> |Les Miserables|
> |The Count of Monte Cristo|
> |Odyssey|
> *Actual results*
> ||B_TITLE||
> |Les Miserables|
> |The Count of Monte Cristo|
> {{Odyssey}} is missing from the result set and it shouldn't since with the application of COALESCE operator it should match with the UNKNOWN author.



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