[jira] [Commented] (SPARK-19017) NOT IN subquery with more than one column may return incorrect results

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-19017?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15796839#comment-15796839 ] 

Apache Spark commented on SPARK-19017:
--------------------------------------

User 'nsyca' has created a pull request for this issue:
https://github.com/apache/spark/pull/16467

> 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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