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https://issues.apache.org/jira/browse/SPARK-19017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15785496#comment-15785496
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Nattavut Sutyanyong commented on SPARK-19017:
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In 3-value logic, true OR unknown = true. Using your formula above, we will
have (2,1) NOT IN (1,null) evaluated as (2 <> 1) OR (1 <> null) which is true.
> NOT IN subquery with more than one column may return incorrect results
> ----------------------------------------------------------------------
>
> Key: SPARK-19017
> URL: https://issues.apache.org/jira/browse/SPARK-19017
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.0, 2.0.1, 2.0.2, 2.1.0
> Reporter: Nattavut Sutyanyong
>
> When putting more than one column in the NOT IN, the query may not return
> correctly if there is a null data. We can demonstrate the problem with the
> following data set and query:
> {code}
> Seq((2,1)).toDF("a1","b1").createOrReplaceTempView("t1")
> Seq[(java.lang.Integer,java.lang.Integer)]((1,null)).toDF("a2","b2").createOrReplaceTempView("t2")
> sql("select * from t1 where (a1,b1) not in (select a2,b2 from t2)").show
> +---+---+
> | a1| b1|
> +---+---+
> +---+---+
> {code}
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