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From "Christian d'Heureuse (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2231) Materialize/optimize an invariant, non-correlated scalar subquery in the WHERE clause
Date Thu, 11 Jan 2007 02:05:27 GMT
Materialize/optimize an invariant, non-correlated scalar subquery in the WHERE clause
-------------------------------------------------------------------------------------

                 Key: DERBY-2231
                 URL: https://issues.apache.org/jira/browse/DERBY-2231
             Project: Derby
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 10.2.2.0
            Reporter: Christian d'Heureuse


The attached test case shows that an invariant, non-correlated scalar subquery in the WHERE
clause is not materialized/optimized.

A scalar subquery is only allowed to return a single row with a single column. If the subquery
contains no references to outside fields, it should be replaced by a constant value, before
the main query is executed.

see also DERBY-1733

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