[jira] [Commented] (DERBY-6131) select from view with "upper" and "in" list throws a ClassCastException

["Mamta A. Satoor (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DERBY-6131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13620641#comment-13620641 ] 

Mamta A. Satoor commented on DERBY-6131:
----------------------------------------

I reviewed the patch and the changes seems to be in line with the comment at the method level which says
     * A predicate can be pushed into an underlying select if the source of 
     * every ColumnReference in the predicate is itself a ColumnReference.
So if the in list left operate is itself not a column reference, then it probably shoul not be pused down. 

I have a question about the right operands of the in list. Currently we check if right operand list is list of constant. If yes, then we go ahead and push the predicate. I am wondering ifthat check should be changed to if the right operand list is a list of ColumnReference and or Constants and if so then we should be able to push the predicate down. This can go as a separate jira if it is the right thing to do.
                
> select from view with "upper" and "in" list throws a ClassCastException
> -----------------------------------------------------------------------
>
>                 Key: DERBY-6131
>                 URL: https://issues.apache.org/jira/browse/DERBY-6131
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.1.3.3, 10.2.2.1, 10.3.3.1, 10.4.2.1, 10.5.3.2, 10.6.2.3, 10.7.1.4, 10.9.1.0, 10.8.3.0
>         Environment: windows
>            Reporter: Rong Qu
>            Assignee: Mike Matrigali
>         Attachments: derby-6131-patch.txt
>
>
> the issue can be reproduced
> 1. create table myTbl1 (name varchar(1000));
> 2. create table myTbl2 (name varchar(1000));
> 3. create view myView (name) as select t1.name from myTbl1 t1 union all select t2.name from myTbl2 t2;
> 4. select name from myView where upper(name) in ('AA', 'BB');
> #4 failed with "org.apache.derby.impl.sql.compile.SimpleStringOperatorNode incompatible with org.apache.derby.impl.sql.compile.ColumnReference: java.lang.ClassCastException"
> If the view is created as "create myView (name) as select t1.name from myTbl1 t1", the query worked fine.

--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira