[jira] [Commented] (SPARK-21160) Filtering rows with "not equal" operator yields unexpected result with null rows

["Takeshi Yamamuro (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-21160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16057587#comment-16057587 ] 

Takeshi Yamamuro commented on SPARK-21160:
------------------------------------------

This is an expected behaviour. Probably, you want to do like "df.where("Test != 1 OR Test is null").show(), right?

> Filtering rows with "not equal" operator yields unexpected result with null rows
> --------------------------------------------------------------------------------
>
>                 Key: SPARK-21160
>                 URL: https://issues.apache.org/jira/browse/SPARK-21160
>             Project: Spark
>          Issue Type: Bug
>          Components: PySpark, Spark Core, SQL
>    Affects Versions: 2.0.2
>            Reporter: Edoardo Vivo
>            Priority: Minor
>
> ```
> schema = StructType([StructField("Test", DoubleType())])
> test2 = spark.createDataFrame([[1.0],[1.0],[2.0],[2.0],[None]], schema=schema)
> test2.where("Test != 1").show()
> ```
> This returns only the rows with the value 2, it does not return the null row. This should not be the expected behavior, IMO. 
> Thank you.



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