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From "Dag H. Wanvik (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-6009) Need stricter checking of ORDER BY clause in VALUES expressions
Date Sun, 23 Dec 2012 22:30:13 GMT

    [ https://issues.apache.org/jira/browse/DERBY-6009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13539105#comment-13539105
] 

Dag H. Wanvik commented on DERBY-6009:
--------------------------------------

There are more anomalies, this time with a select, cf. this statement:

>create table t(i int, j int, k float);
>insert into t values (1,1,1.0),(3,9,9.0),(2,4,4.0);
>select * from t;
I          |J          |K                     
----------------------------------------------
1          |1          |1.0                   
3          |9          |9.0                   
2          |4          |4.0  

>select * from t order by 3+1;
I          |J          |K                     
----------------------------------------------
2          |4          |4.0                   
3          |9          |9.0                   
1          |1          |1.0                   

So, the constant expression (which even if evaluated) would give a number of a non-present
column, #4, isn't flagged, and strangely, the rows are returned backwards.


                
> Need stricter checking of ORDER BY clause in VALUES expressions
> ---------------------------------------------------------------
>
>                 Key: DERBY-6009
>                 URL: https://issues.apache.org/jira/browse/DERBY-6009
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.9.1.0
>            Reporter: Knut Anders Hatlen
>            Priority: Minor
>
> We only support column numbers in ORDER BY clauses in VALUES expression, as seen by this
error message:
> ij> values 1,2 order by 1+2;
> ERROR 42878: The ORDER BY clause of a SELECT UNION statement only supports unqualified
column references and column position numbers. Other expressions are not currently supported.
(errorCode = 30000)
> However, the checks let some unsupported expressions through and produce strange results.
For example:
> ij> values 1 order by 1+2;
> 1          |2          
> -----------------------
> 1          |3          
> 1 row selected
> It should probably have raised the same exception as the first query. And if not, the
result should only have had one column.
> And the next example should probably have raised a syntax error too, instead of a NullPointerException:
> ij> values 1 order by int(1);
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'. (errorCode = 0)

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