Materialize/optimize an invariant, non-correlated scalar subquery in the WHERE
clause
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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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