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https://issues.apache.org/jira/browse/DERBY-5973?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13487894#comment-13487894
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Knut Anders Hatlen commented on DERBY-5973:
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Looks like the boolean IS operator used to be available in old Cloudscape
versions, which explains why the implementation methods are there.
Found it mentioned in this copy of the Cloudscape 3.0 reference manual:
http://www.di.ufpe.br/~java/docs/j2sdkee1.2.1/doc/cloudscape/doc/html/coredocs/sqlj110.htm#1099621
> Add syntax for boolean IS operator
> ----------------------------------
>
> Key: DERBY-5973
> URL: https://issues.apache.org/jira/browse/DERBY-5973
> Project: Derby
> Issue Type: Improvement
> Components: SQL
> Reporter: Knut Anders Hatlen
> Priority: Minor
>
> The BooleanDataValue interface and the SQLBoolean class implement the boolean
> IS operator in their is() and isNot() methods. However, the operator is not
> exposed in the grammar, so there's no way to use it.
> The boolean IS operator is defined in the SQL:2003 standard, part 2, section
> 6.34 <boolean value expression>.
> <boolean test> ::= <boolean primary> [ IS [ NOT ] <truth value> ]
> There's also Table 13 — Truth table for the IS boolean operator.
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