[teiid-issues] [JBoss JIRA] (TEIID-2858) Database use of char[>1] cause using Convert(x, x) and negates using an index

[Steven Hawkins (JIRA)]

    [ https://issues.jboss.org/browse/TEIID-2858?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12946606#comment-12946606 ] 

Steven Hawkins commented on TEIID-2858:
---------------------------------------

I still don't think we're on the same page.  You'll need to be quite explicit as to what is happening.  If you have a char[x] modeled as string, there should be no convert involved.  Can you provide a scenario where this is happening?

Yes, Tom that is understood.  As an aside we do now have limited support for function based indexes on internal materialized views.
                
> Database use of char[>1] cause using Convert(x,x) and negates using an index
> ----------------------------------------------------------------------------
>
>                 Key: TEIID-2858
>                 URL: https://issues.jboss.org/browse/TEIID-2858
>             Project: Teiid
>          Issue Type: Bug
>          Components: Misc. Connectors
>    Affects Versions: 8.4.1
>            Reporter: Van Halbert
>            Assignee: Steven Hawkins
>
> When a database defines a char of length greater than 1, a convert(x,x) is being used in the criteria, and thereby, negating the use of an index and causing table scans.  
> Note:  There is no option to change the database schemas, because they are from a COTS product.
> I would think there needs to be a solution in the translator such that if it can be detected that its for a char column and that it does not do the convert. 

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