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https://issues.apache.org/jira/browse/DERBY-4006?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12665076#action_12665076
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Knut Anders Hatlen commented on DERBY-4006:
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Thanks for fixing this, Bryan. I've verified that it works on head of trunk and
10.4 now. I'm happy with having the fix on those two branches, but anyone
should feel free to merge it to 10.3 and 10.2 as well if they think that's
required. It might be worth the extra effort to ensure that we don't have any
known regressions on the stable branches.
> 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, tenFourPatch.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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