[jira] Updated: (DERBY-1703) The documentation for (or implementation of) SUBSTR(string,start,length) is wrong

["Dyre Tjeldvoll (JIRA)" <de...@db.apache.org>]

     [ http://issues.apache.org/jira/browse/DERBY-1703?page=all ]

Dyre Tjeldvoll updated DERBY-1703:
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    Summary: The documentation for (or implementation of) SUBSTR(string,start,length) is wrong  (was: The documentation for (or implementation of) SUBSTR(s,len) is wrong)

> The documentation for (or implementation of) SUBSTR(string,start,length) is wrong
> ---------------------------------------------------------------------------------
>
>                 Key: DERBY-1703
>                 URL: http://issues.apache.org/jira/browse/DERBY-1703
>             Project: Derby
>          Issue Type: Bug
>          Components: Documentation
>    Affects Versions: 10.1.3.1
>            Reporter: Dyre Tjeldvoll
>            Priority: Minor
>             Fix For: 10.3.0.0
>
>
> The latest alpha manuals say:
> "If startPosition is positive, it refers to position from the start of the source expression (counting the first character as 1). If startPosition is 
> negative, it is the position from the end of the source."
> But when I try to use substr with a negative starting position, I get:
> $ java org.apache.derby.tools.ij repro.sql
> ij version 10.2
> ij> connect 'jdbc:derby:/home/dt136804/repro;create=true;territory=en_US';
> ij> create table t1(c1 varchar(128));
> 0 rows inserted/updated/deleted
> ij> insert into t1 values ('The dog ate my homework');
> 1 row inserted/updated/deleted
> ij> select substr(c1,-1,8) from t1;
> 1       
> --------
> ERROR 22011: The second or third argument of the SUBSTR function is out of range.
> and not 'homework' as I would expect.
> The SQL standard (2003) does not seem to say anything about negative starting positions...

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