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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Created] (DERBY-5973) Add syntax for boolean IS operator
Date Wed, 31 Oct 2012 12:45:12 GMT
Knut Anders Hatlen created DERBY-5973:

             Summary: 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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