[ exist-Bugs-1963345 ] Table corruption on replace; correlates with root attributes

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Bugs item #1963345, was opened at 2008-05-13 20:18
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Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: ggdinger (ggdinger)
Assigned to: Nobody/Anonymous (nobody)
Summary: Table corruption on replace; correlates with root attributes

Initial Comment:
Version: 1.2.0-rev7233

When attempting to operate a 'replace' on a child element of root,
the table becomes corrupted.

The corruption correlates with the number of attributes defined on the root. In
the example table included below, the root element 'user' has three attributes.
If you count the child-elements up from the bottom, the third element on that
count (in this case, element <four>) is the one that will consistently fail to
'replace'. This failure pattern is 100% reproducible; I can change the number
of attributes on the root element and move the failure point accordingly (e.g.
including four attributes will cause element <three> to fail, five attributes
will fail <two>, etc). Interestingly, by supplying more attributes than
child-elements, the 'replace' defect appears to be avoided.

Original table:
===============
<userList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="user.xsd">
    <user a1="a1" a2="a2" userID="admin">
        <one>
            <oneAtt>1</oneAtt>
        </one>
        <two>
            <twoAtt>2</twoAtt>
        </two>
        <three>
            <threeAtt>3</threeAtt>
        </three>
        <four>
            <fourAtt>4</fourAtt>
        </four>
        <five>
            <fiveAtt>5</fiveAtt>
        </five>
        <six/>
    </user>
</userList>

Input via client tool:
======================
All 'replace' operations on elements <one>,<two>,<three>,<five>, and <six> function without issue.
However, the following 'replace' on element <four>: ...

update replace //user[@userID='admin']/four with
        <four>
            <fourAtt>444</fourAtt>
        </four>


Resulting Table:
================
...results in the following corrupted table: ...

<userList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="user.xsd">
    <user>
        <four>
            <fourAtt>4</fourAtt>
        </four>a1a2admin<one>
            <oneAtt>1</oneAtt>
        </one>
        <two>
            <twoAtt>2</twoAtt>
        </two>
        <three>
            <threeAtt>3</threeAtt>
        </three>
        <five>
            <fiveAtt>5</fiveAtt>
        </five>
        <six/>
    </user>
</userList>


If the number of root element attributes is increased from three to four, the 'replace' operation
will then function correctly for all child elements except <three>:

Original Table:
==============
<userList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="user.xsd">
    <user a1="a1" a2="a2" a3="a3" userID="admin">
        <one>
            <oneAtt>1</oneAtt>
        </one>
        <two>
            <twoAtt>2</twoAtt>
        </two>
        <three>
            <threeAtt>3</threeAtt>
        </three>
        <four>
            <fourAtt>4</fourAtt>
        </four>
        <five>
            <fiveAtt>5</fiveAtt>
        </five>
        <six/>
    </user>
</userList>


Input via client tool:
======================
update replace //user[@userID='admin']/three with
        <three>
            <threeAtt>333</threeAtt>
        </three>

Resulting Table:
================
<userList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="user.xsd">
    <user>
        <three>
            <threeAtt>3</threeAtt>
        </three>a1a2a3admin<one>
            <oneAtt>1</oneAtt>
        </one>
        <two>
            <twoAtt>2</twoAtt>
        </two>
        <four>
            <fourAtt>4</fourAtt>
        </four>
        <five>
            <fiveAtt>5</fiveAtt>
        </five>
        <six/>
    </user>
</userList>


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