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https://issues.apache.org/jira/browse/DERBY-2923?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12511799
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Daniel John Debrunner commented on DERBY-2923:
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Seems like a test case would fit into the existing upgrade tests easily.
> Incorrect reading of nullable Blob/Clob columns during soft upgrade with
> client/server
> --------------------------------------------------------------------------------------
>
> Key: DERBY-2923
> URL: https://issues.apache.org/jira/browse/DERBY-2923
> Project: Derby
> Issue Type: Bug
> Components: Network Server
> Affects Versions: 10.3.0.0, 10.3.1.0, 10.3.1.1
> Environment: Client/server soft upgrade
> Reporter: Øystein Grøvlen
> Assignee: Øystein Grøvlen
> Priority: Blocker
> Fix For: 10.3.1.1
>
> Attachments: SimpleBlobTest.java
>
>
> Select operations with client/server and soft upgrade mode will not see first
> byte of the Blob/Clob if the LOB column is nullable.
> The reason seems to be that during soft upgrade, the network server does not
> prepend the LOB data with the byte indicating whether the column is null or
> not. Hence, the first data byte will be interpreted by the client as the
> null byte, and the reading of the LOB will start at the second byte.
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