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https://issues.apache.org/jira/browse/DERBY-4006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12662834#action_12662834
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Bryan Pendleton commented on DERBY-4006:
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In order to successfully merge this patch back to the 10.4 branch,
the tests for the ALTER COLUMN behavior on generated columns
must be removed, as 10.4 does not have generated column support.
> ALTER COLUMN ... WITH DEFAULT NULL does not change the default
> --------------------------------------------------------------
>
> Key: DERBY-4006
> URL: https://issues.apache.org/jira/browse/DERBY-4006
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.2.2.0, 10.3.1.4, 10.3.2.1, 10.3.3.0, 10.4.1.3,
> 10.4.2.0
> Reporter: Knut Anders Hatlen
> Assignee: Bryan Pendleton
> Attachments: addGenColTest.diff, patchWithTest.diff,
> quickCodePatch.diff
>
>
> Reported on derby-user.
> http://mail-archives.apache.org/mod_mbox/db-derby-user/200901.mbox/%[email protected]%3e
> ij> create table t (x varchar(5) default 'abc');
> 0 rows inserted/updated/deleted
> ij> alter table t alter column x with default null;
> 0 rows inserted/updated/deleted
> ij> insert into t values default;
> 1 row inserted/updated/deleted
> ij> select * from t;
> X
> -----
> abc
> 1 row selected
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