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https://issues.apache.org/jira/browse/DERBY-4448?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12779704#action_12779704
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Knut Anders Hatlen commented on DERBY-4448:
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I think the problem is that DMLModStatementNode.forbidGenerationOverrides()
only looks at and modifies the RCL of the top-most source result set. Since it
removes generated columns from both the target RCL and the source RCL, the
child result sets of the UnionNode representing the multi-row VALUES clause are
not processed, so all rows except the first row will end up with more columns
than the target RCL.
> ArrayIndexOutOfBoundsException when trying to override generated column
> -----------------------------------------------------------------------
>
> Key: DERBY-4448
> URL: https://issues.apache.org/jira/browse/DERBY-4448
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.3.0, 10.6.0.0
> Reporter: Knut Anders Hatlen
>
> ij> create table t(a int, b generated always as (-a));
> 0 rows inserted/updated/deleted
> ij> insert into t(b) values (default), (2);
> ERROR XJ001: Java exception: '0 >= 0:
> java.lang.ArrayIndexOutOfBoundsException'.
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