[teiid-issues] [JBoss JIRA] (TEIID-1893) TeiidException when executing SELECT subquery with more than 2 UNIONs

[Andriy Rokhmanov (Created) (JIRA)]

TeiidException when executing SELECT subquery with more than 2 UNIONs
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                 Key: TEIID-1893
                 URL: https://issues.jboss.org/browse/TEIID-1893
             Project: Teiid
          Issue Type: Bug
          Components: Query Engine
    Affects Versions: 7.6
         Environment: Windows 7, JBoss 5.1.0.GA, java version "1.6.0_22" 64 bit
            Reporter: Andriy Rokhmanov
            Assignee: Steven Hawkins


Exception: org.teiid.core.TeiidException happens after executing select statement #1, but works fine on #2 and #3.
The execution plan for problematic statement attached.

1. Problematic SQL Statement:

	SELECT T.ROLE_NAME as ROLE_NAME, T.SCHEMA_NAME as SCHEMA_NAME, T.INSTALL_STATUS as INSTALL_STATUS
		FROM (
				SELECT ROLE_NAME, 'demodata_chorus_metadata' as SCHEMA_NAME, INSTALL_STATUS from demodata_chorus_metadata.chorus_role 
				UNION
				SELECT ROLE_NAME, 'security_cia_chorus_metadata' as SCHEMA_NAME, INSTALL_STATUS from security_cia_chorus_metadata.chorus_role 
				UNION
				SELECT ROLE_NAME, 'vantage_chorus_metadata' as SCHEMA_NAME, INSTALL_STATUS from vantage_chorus_metadata.chorus_role 
			) AS T, chorus_license.RL_LICENSE as L 
		WHERE T.ROLE_NAME = L.ROLE_NAME 
		AND T.install_status = true;



2. This SQL statement works fine (the difference between #1 and #2 is in final 'AND...' clause):

	SELECT T.ROLE_NAME as ROLE_NAME, T.SCHEMA_NAME as SCHEMA_NAME, T.INSTALL_STATUS as INSTALL_STATUS
		FROM (
				SELECT ROLE_NAME, 'demodata_chorus_metadata' as SCHEMA_NAME, INSTALL_STATUS from demodata_chorus_metadata.chorus_role 
				UNION
				SELECT ROLE_NAME, 'security_cia_chorus_metadata' as SCHEMA_NAME, INSTALL_STATUS from security_cia_chorus_metadata.chorus_role 
				UNION
				SELECT ROLE_NAME, 'vantage_chorus_metadata' as SCHEMA_NAME, INSTALL_STATUS from vantage_chorus_metadata.chorus_role 
			) AS T, chorus_license.RL_LICENSE as L 
		WHERE T.ROLE_NAME = L.ROLE_NAME;



3. This SQL statement also works fine (the difference between #1 and #3 is only two UNIONs included out of three, does not matter which ones)

	SELECT T.ROLE_NAME as ROLE_NAME, T.SCHEMA_NAME as SCHEMA_NAME, T.INSTALL_STATUS as INSTALL_STATUS
		FROM (
				SELECT ROLE_NAME, 'security_cia_chorus_metadata' as SCHEMA_NAME, INSTALL_STATUS from security_cia_chorus_metadata.chorus_role 
				UNION
				SELECT ROLE_NAME, 'vantage_chorus_metadata' as SCHEMA_NAME, INSTALL_STATUS from vantage_chorus_metadata.chorus_role 
			) AS T, chorus_license.RL_LICENSE as L 
		WHERE T.ROLE_NAME = L.ROLE_NAME 
		AND T.install_status = true;


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