[teiid-issues] [JBoss JIRA] Commented: (TEIID-1665) Optimize SELECT of all constants

Thu Jun 30 14:02:23 EDT 2011

    [ https://issues.jboss.org/browse/TEIID-1665?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12612069#comment-12612069 ] 

Mark Addleman commented on TEIID-1665:
--------------------------------------

Will it?  My logic could be off.  I'm thinking that 

SELECT 'A' as A, 'B' as B FROM xyz GROUP BY A, B

will always result in either zero or one row depending on whether table xyz is empty or not.  

> Optimize SELECT of all constants
> --------------------------------
>
>                 Key: TEIID-1665
>                 URL: https://issues.jboss.org/browse/TEIID-1665
>             Project: Teiid
>          Issue Type: Feature Request
>          Components: Query Engine
>    Affects Versions: 7.4
>            Reporter: Mark Addleman
>            Assignee: Steven Hawkins
>            Priority: Minor
>
> If a translator supports LIMIT but does not support select expressions, SELECT 'A' as A, 'B' as B FROM xyz GROUP BY A, B should be written as SELECT * FROM xyz LIMIT 1

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