Julian Hyde created CALCITE-3369:
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Summary: In LatticeSuggester, recommend lattices based on UNION
queries
Key: CALCITE-3369
URL: https://issues.apache.org/jira/browse/CALCITE-3369
Project: Calcite
Issue Type: Bug
Reporter: Julian Hyde
In LatticeSuggester, recommend lattices based on UNION, EXCEPT and INTERSECT
queries. Currently such queries are ignored.
Given the query
{code:java}
select * from t1 join t2
union
select * from t2 join t3;{code}
suggester should generate the same lattice(s) as if it had been given two
separate queries
{code:java}
select * from t1 join t2;
select * from t2 join t3; {code}
Which may be a single lattice t1 - t2 - t3, or might be two lattices t1 - t2,
t2 - t3.
Same for EXCEPT (MINUS), INTERSECT, UNION ALL, etc.
If the set-op is internal, I'm not sure what to do, e.g.
{code:java}
select *
from sales
join (select * from good_product
union
select * from bad_product) using (product_id){code}
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