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https://issues.jboss.org/browse/TEIID-2249?page=com.atlassian.jira.plugin...
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Debbie Steigner commented on TEIID-2249:
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Response to Steve from Nelson :
Please pass this information to Steven.
Below is exactly how I would expect it to work. The reason is we can do aggregation at
source instead of in Teiid to reduce the volume of data being transferred across the wire
and performance reason too.
"The other possibility is that he means the entirety of the independent/driving side
of the join would be shipped to form the temporary table such that the complete results
are read by Teiid instead of a secondary in-Teiid join being performed."
Nelson
Enable the use of temporary tables for those data sources that
support them instead of IN criteria for EDS
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Key: TEIID-2249
URL:
https://issues.jboss.org/browse/TEIID-2249
Project: Teiid
Issue Type: Feature Request
Components: Query Engine
Reporter: Debbie Steigner
Assignee: Steven Hawkins
Fix For: 8.4.1
Our proposal is to allow for the more efficient use of large ad-hoc result-sets by rather
than creating a long 'IN' list, inserting them in to a temporary table - for
example a # table in Sybase and SQL Server - and then generating an SQL join to that
instead.
One of the difference to materialized views (or at least my understanding), is that this
work happens at a data-source rather than within the Teiid server.
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