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

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