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From "A B (JIRA)" <j...@apache.org>
Subject [jira] Closed: (DERBY-1939) ERROR XSDA7 while executing query that spills to BackingStoreHashTable
Date Wed, 21 Feb 2007 18:55:06 GMT

     [ https://issues.apache.org/jira/browse/DERBY-1939?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

A B closed DERBY-1939.

> ERROR XSDA7 while executing query that spills to BackingStoreHashTable
> ----------------------------------------------------------------------
>                 Key: DERBY-1939
>                 URL: https://issues.apache.org/jira/browse/DERBY-1939
>             Project: Derby
>          Issue Type: Bug
>          Components: Store
>    Affects Versions:,
>            Reporter: A B
>         Assigned To: Mike Matrigali
>             Fix For:
>         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
> +++ java/engine/org/apache/derby/impl/store/access/heap/HeapRowLocation.java	(working
> @@ -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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