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https://issues.apache.org/jira/browse/DERBY-4410?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12767445#action_12767445
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Bryan Pendleton commented on DERBY-4410:
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Great find! I remember stepping through this code once and noticing that it
re-processed the columns after expanding them, but it had never occurred
to me that it would have this behavior if the * expanded to an empty set.
Fix looks fine to me, and the comment is quite useful thanks. But maybe the
indentation looks off (spaces vs tabs?)
> NullPointerException when USING clause contains all columns in both join
> tables
> -------------------------------------------------------------------------------
>
> Key: DERBY-4410
> URL: https://issues.apache.org/jira/browse/DERBY-4410
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.6.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Knut Anders Hatlen
> Attachments: adjustIndex.diff
>
>
> ij> create table t(x int);
> 0 rows inserted/updated/deleted
> ij> select t1.*, t2.* from t t1 join t t2 using (x);
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
> This statement should have raised an exception because both t1.* and t2.*
> expand to no columns. See DERBY-4407.
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