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https://issues.apache.org/jira/browse/DERBY-4419?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12769135#action_12769135
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Knut Anders Hatlen commented on DERBY-4419:
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It looks like the bug was introduced by this commit:
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r487414 | bpendleton | 2006-12-15 02:01:14 +0100 (Fri, 15 Dec 2006) | 55 lines
DERBY-1644: NPE when inserting values to tbl w/ identity col gen by default
(...)
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> NullPointerException with INSERT INTO ... from UNION and generated columns
> --------------------------------------------------------------------------
>
> Key: DERBY-4419
> URL: https://issues.apache.org/jira/browse/DERBY-4419
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.3.1.4, 10.4.1.3, 10.5.1.1, 10.5.3.0, 10.6.0.0
> Reporter: Knut Anders Hatlen
> Attachments: npe.sql
>
>
> The following sequence of statements works on 10.2.2.0 and earlier, and
> raises a NullPointerException with 10.3.1.4 and later:
> ij> create table t1(x int);
> 0 rows inserted/updated/deleted
> ij> insert into t1 values 1,2;
> 2 rows inserted/updated/deleted
> ij> create table t2(x int);
> 0 rows inserted/updated/deleted
> ij> insert into t2 values 2,3;
> 2 rows inserted/updated/deleted
> ij> create table t3(x int, y int generated always as identity);
> 0 rows inserted/updated/deleted
> ij> insert into t3(x) select * from t1 union select * from t2;
> ERROR XJ001: Java exception: ': java.lang.NullPointerException'.
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