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https://issues.apache.org/jira/browse/HIVE-21231?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16803148#comment-16803148
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Vineet Garg commented on HIVE-21231:
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[~mgergely] Can you open a pull request?
> HiveJoinAddNotNullRule support for range predicates
> ---------------------------------------------------
>
> Key: HIVE-21231
> URL: https://issues.apache.org/jira/browse/HIVE-21231
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Miklos Gergely
> Priority: Major
> Labels: newbie
> Attachments: HIVE-21231.01.patch, HIVE-21231.02.patch,
> HIVE-21231.03.patch, HIVE-21231.04.patch, HIVE-21231.05.patch,
> HIVE-21231.06.patch
>
>
> For instance, given the following query:
> {code:sql}
> SELECT t0.col0, t0.col1
> FROM
> (
> SELECT col0, col1 FROM tab
> ) AS t0
> INNER JOIN
> (
> SELECT col0, col1 FROM tab
> ) AS t1
> ON t0.col0 < t1.col0 AND t0.col1 > t1.col1
> {code}
> we could still infer that col0 and col1 cannot be null for any of the inputs.
> Currently we do not.
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