[jira] [Commented] (SPARK-29626) notEqual() should return true when the one is null, the other is not null

["Aman Omer (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-29626?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16961770#comment-16961770 ] 

Aman Omer commented on SPARK-29626:
-----------------------------------

Looking into this one.

> notEqual() should return true when the one is null, the other is not null
> -------------------------------------------------------------------------
>
>                 Key: SPARK-29626
>                 URL: https://issues.apache.org/jira/browse/SPARK-29626
>             Project: Spark
>          Issue Type: Improvement
>          Components: Documentation
>    Affects Versions: 2.4.4
>            Reporter: zhouhuazheng
>            Priority: Minor
>
> the one is null，the other is not null, then use the function notEqual(), we hope it return true . 
> eg: 
> scala> df.show()
> +------+-------+
> | age| name|
> +------+-------+
> | null|Michael|
> | 30| Andy|
> | 19| Justin|
> | 35| null|
> | 19| Justin|
> | null| null|
> |Justin| Justin|
> | 19| 19|
> +------+-------+
> scala> df.filter(col("age").notEqual(col("name"))).show
> +---+------+
> |age| name|
> +---+------+
> | 30| Andy|
> | 19|Justin|
> | 19|Justin|
> +---+------+
> scala> df.filter(col("age").equalTo(col("name"))).show
> +------+------+
> | age| name|
> +------+------+
> | null| null|
> |Justin|Justin|
> | 19| 19|
> +------+------+



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