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From "Knut Anders Hatlen (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DERBY-4793) Assert failure when concatenating strings with total size greater than 32K
Date Fri, 09 Dec 2011 08:02:40 GMT

    [ https://issues.apache.org/jira/browse/DERBY-4793?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13165920#comment-13165920
] 

Knut Anders Hatlen commented on DERBY-4793:
-------------------------------------------

Yes, it looks like an exception should be raised:

ISO/IEC 9075-2:2003 (E)
6.28 <string value expression>

General Rules

2) b) ii) 3) B) If the most specific type of either S1 or S2 is variable-length character
string, then let
VL be the implementation-defined maximum length of variable-length character strings.

Case:
I) If M is less than or equal to VL, then the result of the <concatenation> is S with
  length M.
II) If M is greater than VL and the right-most M–VL characters of S are all the <space>
     character, then the result of the <concatenation> is the first VL characters of
S
    with length VL.
III) Otherwise, an exception condition is raised: data exception — string data, right
      truncation.
                
> Assert failure when concatenating strings with total size greater than 32K
> --------------------------------------------------------------------------
>
>                 Key: DERBY-4793
>                 URL: https://issues.apache.org/jira/browse/DERBY-4793
>             Project: Derby
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 10.6.1.0
>            Reporter: Knut Anders Hatlen
>              Labels: derby_triage10_8
>         Attachments: concat.sql
>
>
> When concatenating two strings whose total length exceeds the maximum length for a VARCHAR,
an assert is triggered in the debug jars:
> ij> values length('0123456789.....' || '0123456789.....');
> ERROR XJ001: Java exception: 'ASSERT FAILED The maximum length 35000 for the result type
VARCHAR can't be greater than it's maximum width of result's typeid32672: org.apache.derby.shared.common.sanity.AssertFailure'.
> With non-debug jars, the same query completes successfully:
> ij> values length('0123456789.....' || '0123456789.....');
> 1          
> -----------
> 35000      
> 1 row selected
> I think this query is supposed to fail, also with non-debug jars, but in any even it
shouldn't be raising assert failures.

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