[teiid-issues] [JBoss JIRA] (TEIID-1880) Support UNION ALL in multi source models
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https://issues.jboss.org/browse/TEIID-1880?page=com.atlassian.jira.plugin...
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Steven Hawkins resolved TEIID-1880.
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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
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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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