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https://issues.apache.org/jira/browse/DERBY-4146?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas updated DERBY-4146:
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Attachment: derby-4146-01-aa-addColumnDescriptor.diff
Attaching derby-4146-01-aa-addColumnDescriptor.diff. This fixes the bug.
I compared the bound trees for the following queries. The first query failed
and the second succeeded:
insert into t_4146 values ( default, default )
insert into t_4146 (c1, c2) values ( default, default )
On the second query, the generated result column had more information, viz., it
was bound to a column descriptor. For the first query, the column descriptor
was being bound for identity columns (but not generated columns) in
ResultColumnList.forbidOverrides(). The fix was to bind a column descriptor
there for generated columns as well.
So far no-one has offered a different interpretation of the SQL Standard. If
the tests run cleanly, I intend to commit this patch unless someone objects to
my interpretation.
Touches the following files:
M java/engine/org/apache/derby/impl/sql/compile/ResultColumnList.java
Fix as described above.
M
java/testing/org/apache/derbyTesting/functionTests/tests/lang/GeneratedColumnsTest.java
Added regression tests for this bug.
> Cannot insert row when a generated column references an identity column
> -----------------------------------------------------------------------
>
> Key: DERBY-4146
> URL: https://issues.apache.org/jira/browse/DERBY-4146
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.5.1.0
> Reporter: Knut Anders Hatlen
> Attachments: derby-4146-01-aa-addColumnDescriptor.diff
>
>
> ij> create table t (c1 int generated always as identity, c2 generated always
> as (c1));
> 0 rows inserted/updated/deleted
> ij> insert into t values (default, default);
> ERROR 23502: Column 'C2' cannot accept a NULL value.
> Preferably, this should work. Alternatively, if it is not supposed to work,
> it should fail when the table is created and the error message should state
> that a generated column is not allowed to reference an identity column.
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