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Posted to derby-dev@db.apache.org by "Mamta A. Satoor (JIRA)" <ji...@apache.org> on 2012/10/02 18:17:08 UTC
[jira] [Updated] (DERBY-2231) Materialize/optimize an invariant,
non-correlated scalar subquery in the WHERE clause
[ https://issues.apache.org/jira/browse/DERBY-2231?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mamta A. Satoor updated DERBY-2231:
-----------------------------------
Urgency: Normal
Labels: derby_triage10_10 (was: )
> 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
> Labels: derby_triage10_10
> 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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