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https://issues.apache.org/jira/browse/SPARK-21160?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16057722#comment-16057722
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Edoardo Vivo commented on SPARK-21160:
--------------------------------------
Thank you for your answer. I noticed the same happens in relational databases
and in R too. Strangely enough, it is the first time I have come across this
issue.
However, I still keep my opinion that this should not be the default behavior.
I understand you will probably close this issue, however I would like to
suggest that maybe issuing a Warning in this case might be helpful (for naive
users like me).
Thank you again
> 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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