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https://issues.apache.org/jira/browse/DERBY-4256?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12715998#action_12715998
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Bryan Pendleton commented on DERBY-4256:
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Hi Evan, thanks for having a look at this.
I think the first place to start is with the 'checkUserType()' method in
o.a.d.impl.sql.compile.ModifyColumnNode. Look around line 118.
> allow alter table to increase the maximum size of a blob and a clob.
> --------------------------------------------------------------------
>
> Key: DERBY-4256
> URL: https://issues.apache.org/jira/browse/DERBY-4256
> Project: Derby
> Issue Type: New Feature
> Affects Versions: 10.5.1.1
> Reporter: Mike Matrigali
> Priority: Minor
>
> Allow new syntax that allows user to alter the maximum length of a blob
> and/or clob column:
> ALTER TABLE binarydata ALTER COLUMN data SET DATA TYPE blob(128M)
> The syntax should match up with the existing functionality to increase the
> size of varchar fields.
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