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https://issues.apache.org/jira/browse/DERBY-4704?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas resolved DERBY-4704.
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Fix Version/s: 10.7.0.0
Resolution: Fixed
Tests passed cleanly. Committed at subversion revision 956025.
> Incorrect nullability when casting non-nullable VARCHAR to BOOLEAN
> ------------------------------------------------------------------
>
> Key: DERBY-4704
> URL: https://issues.apache.org/jira/browse/DERBY-4704
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.7.0.0
> Reporter: Knut Anders Hatlen
> Assignee: Rick Hillegas
> Fix For: 10.7.0.0
>
> Attachments: derby-4704-01-aa-nullability.diff, repro.diff
>
>
> With the following table definition and query
> CREATE TABLE T (X VARCHAR(10) NOT NULL);
> INSERT INTO T VALUES 'true', 'false', 'unknown';
> SELECT CAST(X AS BOOLEAN) FROM T;
> the meta-data for the returned result will say that the column is not
> nullable, although it will contain a NULL value in the third row.
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