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https://issues.apache.org/jira/browse/SPARK-30207?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wenchen Fan resolved SPARK-30207.
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Fix Version/s: 3.0.0
Resolution: Fixed
Issue resolved by pull request 26837
[https://github.com/apache/spark/pull/26837]
> Enhance the SQL NULL Semantics document
> ---------------------------------------
>
> Key: SPARK-30207
> URL: https://issues.apache.org/jira/browse/SPARK-30207
> Project: Spark
> Issue Type: Improvement
> Components: Documentation, SQL
> Affects Versions: 3.0.0
> Reporter: Yuanjian Li
> Assignee: Yuanjian Li
> Priority: Major
> Fix For: 3.0.0
>
>
> Enhancement of the SQL NULL Semantics document: sql-ref-null-semantics.html.
> Clarify the behavior of `UNKNOW` for both `EXIST` and `IN` operation.
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