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https://issues.apache.org/jira/browse/DERBY-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Christian d'Heureuse updated DERBY-2231:
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Attachment: testcase1.sql
> 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
> Attachments: testcase1.sql
>
>
> 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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