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https://issues.apache.org/jira/browse/SPARK-16991?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai updated SPARK-16991:
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Target Version/s: 2.0.1, 2.1.0
> Full outer join followed by inner join produces wrong results
> -------------------------------------------------------------
>
> Key: SPARK-16991
> URL: https://issues.apache.org/jira/browse/SPARK-16991
> Project: Spark
> Issue Type: Bug
> Affects Versions: 2.0.0
> Reporter: Jonas Jarutis
> Priority: Critical
>
> I found strange behaviour using fullouter join in combination with inner
> join. It seems that inner join can't match values correctly after full outer
> join. Here is a reproducible example in spark 2.0.
> {code}
> ____ __
> / __/__ ___ _____/ /__
> _\ \/ _ \/ _ `/ __/ '_/
> /___/ .__/\_,_/_/ /_/\_\ version 2.0.0
> /_/
>
> Using Scala version 2.11.8 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_45)
> Type in expressions to have them evaluated.
> Type :help for more information.
> scala> val a = Seq((1,2),(2,3)).toDF("a","b")
> a: org.apache.spark.sql.DataFrame = [a: int, b: int]
> scala> val b = Seq((2,5),(3,4)).toDF("a","c")
> b: org.apache.spark.sql.DataFrame = [a: int, c: int]
> scala> val c = Seq((3,1)).toDF("a","d")
> c: org.apache.spark.sql.DataFrame = [a: int, d: int]
> scala> val ab = a.join(b, Seq("a"), "fullouter")
> ab: org.apache.spark.sql.DataFrame = [a: int, b: int ... 1 more field]
> scala> ab.show
> +---+----+----+
> | a| b| c|
> +---+----+----+
> | 1| 2|null|
> | 3|null| 4|
> | 2| 3| 5|
> +---+----+----+
> scala> ab.join(c, "a").show
> +---+---+---+---+
> | a| b| c| d|
> +---+---+---+---+
> +---+---+---+---+
> {code}
> Meanwhile, without the full outer, inner join works fine.
> {code}
> scala> b.join(c, "a").show
> +---+---+---+
> | a| c| d|
> +---+---+---+
> | 3| 4| 1|
> +---+---+---+
> {code}
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