Stamatis Zampetakis created HIVE-24957:
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Summary: 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
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.
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