[teiid-issues] [JBoss JIRA] (TEIID-1880) Support UNION ALL in multi source models

[Steven Hawkins (Resolved) (JIRA)]

     [ https://issues.jboss.org/browse/TEIID-1880?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Steven Hawkins resolved TEIID-1880.
-----------------------------------

    Resolution: Rejected


Multi-source processing does perform a union all.  The final plan will show a union all node, but there will not be a distinct node unless it is part of the user query.
                
> Support UNION ALL in multi source models
> ----------------------------------------
>
>                 Key: TEIID-1880
>                 URL: https://issues.jboss.org/browse/TEIID-1880
>             Project: Teiid
>          Issue Type: Feature Request
>            Reporter: Mark Addleman
>            Assignee: Steven Hawkins
>
> We have physical data sources that can have many millions of rows.  We are currently using Teiid's multi-source feature to union them together but, I believe Teiid is doing a proper UNION of the tables as opposed to a UNION ALL.  The implied distinct operation in the UNION slows down our queries a lot because many operations cannot be pushed down to the underlying data sources and must be resolved in Teiid.
> We would like the option of performing a UNION ALL on multi source models

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