[
https://issues.apache.org/jira/browse/CALCITE-3369?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17825890#comment-17825890
]
allendang commented on CALCITE-3369:
------------------------------------
Excuse me, does anyone follow up on this issue now?
> 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
> Assignee: Julian Hyde
> Priority: Major
>
> 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}
>
--
This message was sent by Atlassian Jira
(v8.20.10#820010)
