[teiid-issues] [JBoss JIRA] (TEIID-5682) Raise aggregation to allow for join pushdown

[Steven Hawkins (Jira)]

Steven Hawkins created TEIID-5682:
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             Summary: Raise aggregation to allow for join pushdown
                 Key: TEIID-5682
                 URL: https://issues.jboss.org/browse/TEIID-5682
             Project: Teiid
          Issue Type: Enhancement
          Components: Query Engine
            Reporter: Steven Hawkins
            Assignee: Steven Hawkins
             Fix For: 12.x


In some plans, for example those created by odata expand see TEIID-5680, the resulting query has the form of:

select tbl1-cols from tbl1 left outer join (select cols, aggregates ... from tbl2 group by cols) on (some non-aggregate predicate)

If the aggregates or other intervening constructs are not able to be pushed the result will be a federated join.

In most instances (where the tbl1 columns are sortable) it's possible to change this to:

select tbl1-cols aggregates from tbl1 left outer join tbl1 on (...)  group by tbl1-cols, cols

which can allow the pushdown of the join to proceed.



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