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https://issues.apache.org/jira/browse/HIVE-21230?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16804103#comment-16804103
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Jesus Camacho Rodriguez commented on HIVE-21230:
------------------------------------------------
+1 (pending tests)
> LEFT OUTER JOIN does not generate transitive IS NOT NULL filter on right side
> (HiveJoinAddNotNullRule bails out for outer joins)
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-21230
> URL: https://issues.apache.org/jira/browse/HIVE-21230
> Project: Hive
> Issue Type: Improvement
> Components: CBO
> Reporter: Jesus Camacho Rodriguez
> Assignee: Vineet Garg
> Priority: Major
> Labels: newbie
> Attachments: HIVE-21230.1.patch, HIVE-21230.2.patch,
> HIVE-21230.3.patch, HIVE-21230.4.patch
>
>
> For instance, given the following query:
> {code:sql}
> SELECT t0.col0, t0.col1
> FROM
> (
> SELECT col0, col1 FROM tab
> ) AS t0
> LEFT 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 in the right input and
> introduce the corresponding filter predicate. Currently, the rule just bails
> out if it is not an inner join.
> https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/optimizer/calcite/rules/HiveJoinAddNotNullRule.java#L79
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