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From "A B (JIRA)" <derby-...@db.apache.org>
Subject [jira] Updated: (DERBY-1939) ERROR XSDA7 while executing query that spills to BackingStoreHashTable
Date Fri, 06 Oct 2006 18:54:20 GMT
     [ http://issues.apache.org/jira/browse/DERBY-1939?page=all ]

A B updated DERBY-1939:
-----------------------

    Attachment: d1939.java
                d1939_log.txt

Attaching a repro for the problem described in this issue.  To run:

// First load the data.
> java d1939 load

// Then run the query to see the failure.
> java d1939

Remember: Only occurs against 10.1.

Also attaching the derby.log file that results from running of the repro.

> ERROR XSDA7 while executing query that spills to BackingStoreHashTable
> ----------------------------------------------------------------------
>
>                 Key: DERBY-1939
>                 URL: http://issues.apache.org/jira/browse/DERBY-1939
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions: 10.1.3.0, 10.1.3.1, 10.1.3.2
>            Reporter: A B
>         Attachments: d1939.java, d1939_log.txt
>
>
> I have a database with a large query that's failing in Derby 10.1 with:
>   ERROR XSDA7: Restore of a serializable or SQLData object of class , attempted to read
more data than was
>   originally stored
> The error only occurs if I use a PreparedStatement for the query and if I specify a parameter
marker for one particular equality operand.  If I replace the parameter with an actual value,
the query runs without error.
> I was eventually able to come up with a standalone repro that uses nonsense tables and
a nonsense query but still demonstrates the problem.  That said, the error does *not* occur
in Derby 10.2 or main, so it has apparently been fixed in those codelines.
> I did some investigating and was eventually able to track the fix down to svn commit
# 389202 (DERBY-690).  Before that checkin the query fails against 10.2, but after that it
runs without error.  It turns out that there's one uncommented change in svn 389202 that seems
to have fixed the problem, namely:
> Index: java/engine/org/apache/derby/impl/store/access/heap/HeapRowLocation.java
> ===================================================================
> --- java/engine/org/apache/derby/impl/store/access/heap/HeapRowLocation.java	(revision
389043)
> +++ java/engine/org/apache/derby/impl/store/access/heap/HeapRowLocation.java	(working
copy)
> @@ -104,7 +104,7 @@
>     }
>  
>      public DataValueDescriptor getNewNull() {
> -        return null;
> +        return new HeapRowLocation();
>     }
>  
> To confirm I undid this one line change in the 10.3 codeline and then the query started
failing there.  Similarly, after I made this one-line change in the latest 10.1 codeline,
the query started running successfully.  So apparently this is the fix to the problem...though
I don't really know why...?

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