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https://issues.apache.org/jira/browse/SPARK-20463?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiao Li resolved SPARK-20463.
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Resolution: Fixed
Fix Version/s: 2.3.0
> Add support for IS [NOT] DISTINCT FROM to SPARK SQL
> ---------------------------------------------------
>
> Key: SPARK-20463
> URL: https://issues.apache.org/jira/browse/SPARK-20463
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: Michael Styles
> Assignee: Michael Styles
> Fix For: 2.3.0
>
>
> Add support for the SQL standard distinct predicate to SPARK SQL.
> {noformat}
> <expression> IS [NOT] DISTINCT FROM <expression>
> {noformat}
> {noformat}
> data = [(10, 20), (30, 30), (40, None), (None, None)]
> df = sc.parallelize(data).toDF(["c1", "c2"])
> df.createTempView("df")
> spark.sql("select c1, c2 from df where c1 is not distinct from c2").collect()
> [Row(c1=30, c2=30), Row(c1=None, c2=None)]
> {noformat}
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