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

[Mark Addleman (Created) (JIRA)]

Support UNION ALL in multi source models
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                 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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