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https://issues.apache.org/jira/browse/CALCITE-3890?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chunwei Lei updated CALCITE-3890:
---------------------------------
Description:
We can infer IS NOT NULL predicate from join which implies some columns may not
be null. For instance,
{code:java}
select * from a join b on a.id = b.id;
{code}
we can infer a.id is not null and b.id is not null and pushdown them into the
child node of the join. Then it becomes
{code:java}
select * from (select* from a where id is null) t1 join (select * from b where
id is not null) on t1.id = t2.id;
{code}
was:
We can infer IS NOT NULL predicate from join which implies some columns may not
be null. For instance,
{code:java}
select * from a join b on a.id = b.id;
{code}
we can infer a.id is not null and b.id is not null.
> Derive IS NOT NULL filter for the inputs of inner join
> -------------------------------------------------------
>
> Key: CALCITE-3890
> URL: https://issues.apache.org/jira/browse/CALCITE-3890
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Chunwei Lei
> Assignee: Chunwei Lei
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> We can infer IS NOT NULL predicate from join which implies some columns may
> not be null. For instance,
>
> {code:java}
> select * from a join b on a.id = b.id;
> {code}
> we can infer a.id is not null and b.id is not null and pushdown them into the
> child node of the join. Then it becomes
> {code:java}
> select * from (select* from a where id is null) t1 join (select * from b
> where id is not null) on t1.id = t2.id;
> {code}
>
>
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