[teiid-issues] [JBoss JIRA] (TEIID-3674) NOT IN construct behaves inconsistently

[Salvatore R (JIRA)]

Salvatore R created TEIID-3674:
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             Summary: NOT IN construct behaves inconsistently
                 Key: TEIID-3674
                 URL: https://issues.jboss.org/browse/TEIID-3674
             Project: Teiid
          Issue Type: Bug
            Reporter: Salvatore R
            Assignee: Steven Hawkins


As discussed in https://developer.jboss.org/message/939309#939309, an inconsistent behavior of the NOT IN clause occurs when NULL values are returned by the subquery.

For example, let us suppose to have a table defined as:
{code:sql}
CREATE TABLE test1 (col1 character varying(10));

insert into test1 values ('a');  
insert into test1 values ('b');  
insert into test1 values ('c');  
insert into test1 values ('d'); 
{code}

If I enumerate values in the NOT IN clause and one of them is a NULL value:
{code:sql}
select * from pg.test1 where col1 NOT IN ('a', NULL, 'b'); 
{code}

the result is not empty (as it would be expected) but 'c' and 'd' are returned.

Looking at the query plan, the NULL is wrongly removed from the list:

{code:sql}
----------------------------------------------------------------------------  
OPTIMIZATION COMPLETE:  
PROCESSOR PLAN:  
AccessNode(0) output=[pg.test1.col1] SELECT g_0.col1 FROM pg.test1 AS g_0 WHERE g_0.col1 NOT IN ('a', 'b')  
  
  
============================================================================  
{code}



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