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https://issues.apache.org/jira/browse/CALCITE-3890?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17081110#comment-17081110
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Chunwei Lei commented on CALCITE-3890:
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[~vgarg], [~kgyrtkirk] Instead of using a rule to add ISNOTNULL predicate which
is the way in Hive, I am wondering if we can do it when creating the JOIN
operator. Maybe we can add a configuration to indicate whether to add ISNOTNULL
predicate when creating the JOIN operator using RelBuilder.
> Infer IS NOT NULL predicate from join
> -------------------------------------
>
> Key: CALCITE-3890
> URL: https://issues.apache.org/jira/browse/CALCITE-3890
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Chunwei Lei
> Assignee: Vineet Garg
> Priority: Major
>
> 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.
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