Incorrect nullability when casting non-nullable VARCHAR to BOOLEAN
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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
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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