[teiid-issues] [JBoss JIRA] (TEIID-1862) add regression test for nested selects using UNION ALL and multiple aliases of the same column.

add regression test for nested selects using UNION ALL and multiple aliases of the same column. ----------------------------------------------------------------------------------------------- Key: TEIID-1862 URL: https://issues.jboss.org/browse/TEIID-1862 Project: Teiid Issue Type: Task Components: Query Engine Affects Versions: 7.6.1 Environment: Teiid 7.6.x Reporter: Johnathon Lee Assignee: Johnathon Lee Priority: Optional Attachments: teiid-1862_7.6.x.patch Pre 7.x code would throw a NPE with a query similar to [1]. Adding JUnit to prevent regression [1] SELECT enterprise_id FROM ( SELECT * FROM ( SELECT id, id AS display_id, 103 AS enterprise_id FROM ( SELECT 'x' as id) AS nexted103) as table103Source UNION ALL SELECT 'x', 'x' AS display_id, 101 AS enterprise_id FROM ( SELECT 'x') AS nested101 UNION ALL SELECT 'x', 'x' AS display_id, 100 AS enterprise_id FROM ( SELECT 'x') AS nested100) as tableFrom1stSelect WHERE enterprise_id = 100