Steve Carlin created IMPALA-14423:
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Summary: Calcite Planner: Rule needed to make Union over multiple
Values nodes more efficient
Key: IMPALA-14423
URL: https://issues.apache.org/jira/browse/IMPALA-14423
Project: IMPALA
Issue Type: Sub-task
Reporter: Steve Carlin
With v1.40, when we have the query
select 1 union all select 5000;
...Calcite creates the following node structure:
LogicalUnion
LogicalProject
LogicalValues
LogicalProject
LogicalValues
The "1" and the "5000" are places in separate LogicalValues. The resulting
Impala plan is inefficient because it creates an Impala plan that looks like
this:
Union
Union (Value 1)
Union (Value 5000)
...when it could be all placed within a single Union node with 2 tuples.
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