[jira] [Comment Edited] (OPTIQ-373) NOT IN and NULL values

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/OPTIQ-373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14101098#comment-14101098 ] 

Julian Hyde edited comment on OPTIQ-373 at 8/18/14 7:07 PM:
------------------------------------------------------------

The test has proved that we do have a problem. Here is another query, run on postgres, that indicates when the sub-query returns nulls and false:

{code}
with
t1(x) as (select * from  (values (1),(2), (case when 1 = 1 then null else 3 end)) as t(x)),
t2(x) as (select * from  (values (1),(case when 1 = 1 then null else 3 end)) as t(x))
select t1.x, (t1.x not in (select t2.x from t2)) from t1;
   x | ?column? 
-----+----------
   1 | FALSE
   2 | UNKNOWN
NULL | UNKNOWN
(3 rows)
{code}


was (Author: julianhyde):
The test has proved that we do have a problem. Here is another query, run on postgres, that indicates when the sub-query returns nulls and false:

{code}
with
t1(x) as (select * from  (values (1),(2), (case when 1 = 1 then null else 3 end)) as t(x)),
t2(x) as (select * from  (values (1),(case when 1 = 1 then null else 3 end)) as t(x))
select t1.x, (t1.x not in (select t2.x from t2)) from t1;
    x | ?column? 
------+----------
    1 | FALSE
    2 | UNKNOWN
NULL | UNKNOWN
(3 rows)
{code}

> NOT IN and NULL values
> ----------------------
>
>                 Key: OPTIQ-373
>                 URL: https://issues.apache.org/jira/browse/OPTIQ-373
>             Project: Optiq
>          Issue Type: Bug
>            Reporter: Julian Hyde
>            Assignee: Julian Hyde
>         Attachments: OPTIQ-373.1.patch
>
>
> Write a test to check that NOT IN evaluates to unknown, and therefore returns all rows, if the sub-query returns a null.
> Fix if necessary. Also test composite keys.



--
This message was sent by Atlassian JIRA
(v6.2#6252)