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https://issues.apache.org/jira/browse/DERBY-4684?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Rick Hillegas resolved DERBY-4684.
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Resolution: Fixed
> Correct the implicit casting of other types to BOOLEAN
> ------------------------------------------------------
>
> Key: DERBY-4684
> URL: https://issues.apache.org/jira/browse/DERBY-4684
> Project: Derby
> Issue Type: Bug
> Components: SQL
> Affects Versions: 10.6.1.0
> Reporter: Rick Hillegas
> Assignee: Rick Hillegas
> Attachments: derby-4684-01-ab-implicitCastsToBoolean.diff
>
>
> Via a UNION query, it is possible to implicitly cast non-BOOLEAN types to
> BOOLEAN today. These implicit casts do not obey the SQL Standard rules
> defined in part 2, section 6.12 (<cast specification>). Derby should support
> the Standard rules.
> The following query shows how you can implicitly cast a non-BOOLEAN data type
> to BOOLEAN today:
> select isindex from sys.sysconglomerates where conglomeratename = 'foo'
> union
> values ( 1 )
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