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https://issues.apache.org/jira/browse/SPARK-43053?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17709536#comment-17709536
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Yuming Wang commented on SPARK-43053:
-------------------------------------
It's not a issue.
> Possible logic issue
> --------------------
>
> Key: SPARK-43053
> URL: https://issues.apache.org/jira/browse/SPARK-43053
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.0.0
> Environment: Kubernetes sql operator
> Reporter: Rob Harrison
> Priority: Minor
>
> I found this bug when the following query returned no results:
> {code:java}
> WHERE cast(leistungsnummer as long) NOT IN (123)){code}
> However so did the following query:
> {code:java}
> WHERE cast(leistungsnummer as long) IN (123)) {code}
> This can be simplified to the following:
> {code:java}
> WHERE NULL IN (123)
> {code}
> Returns zero results but so does:
> {code:java}
> WHERE NULL NOT IN (123) {code}
> Logically one would assume `NULL IN (123, 456)` would be false. However if
> that is the case then you would think `NULL NOT IN (123, 456)` would be true.
> It seems they both equate to false.
> I don't know if this is a quirk of the SQL spec or if this is a bug in Spark
> SQL implementation but it is causing unexpected results.
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