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https://issues.apache.org/jira/browse/SPARK-16938?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15492643#comment-15492643
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Dongjoon Hyun commented on SPARK-16938:
---------------------------------------

Hi, [~cloud_fan].
Could you review the PR? Or, may I close mine if you have another better 
approach?

> Cannot resolve column name after a join
> ---------------------------------------
>
>                 Key: SPARK-16938
>                 URL: https://issues.apache.org/jira/browse/SPARK-16938
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Mathieu D
>            Priority: Minor
>
> Found a change of behavior on spark-2.0.0, which breaks a query in our code 
> base.
> The following works on previous spark versions, 1.6.1 up to 2.0.0-preview :
> {code}
> val dfa = Seq((1, 2), (2, 3)).toDF("id", "a").alias("dfa")
> val dfb = Seq((1, 0), (1, 1)).toDF("id", "b").alias("dfb")
> dfa.join(dfb, dfa("id") === dfb("id")).dropDuplicates(Array("dfa.id", 
> "dfb.id"))
> {code}
> but fails with spark-2.0.0 with the exception : 
> {code}
> Cannot resolve column name "dfa.id" among (id, a, id, b); 
> org.apache.spark.sql.AnalysisException: Cannot resolve column name "dfa.id" 
> among (id, a, id, b);
>       at 
> org.apache.spark.sql.Dataset$$anonfun$dropDuplicates$1$$anonfun$36$$anonfun$apply$12.apply(Dataset.scala:1819)
>       at 
> org.apache.spark.sql.Dataset$$anonfun$dropDuplicates$1$$anonfun$36$$anonfun$apply$12.apply(Dataset.scala:1819)
>       at scala.Option.getOrElse(Option.scala:121)
>       at 
> org.apache.spark.sql.Dataset$$anonfun$dropDuplicates$1$$anonfun$36.apply(Dataset.scala:1818)
>       at 
> org.apache.spark.sql.Dataset$$anonfun$dropDuplicates$1$$anonfun$36.apply(Dataset.scala:1817)
>       at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
>       at 
> scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:245)
>       at 
> scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
>       at scala.collection.mutable.WrappedArray.foreach(WrappedArray.scala:35)
>       at scala.collection.TraversableLike$class.map(TraversableLike.scala:245)
>       at scala.collection.AbstractTraversable.map(Traversable.scala:104)
>       at 
> org.apache.spark.sql.Dataset$$anonfun$dropDuplicates$1.apply(Dataset.scala:1817)
>       at 
> org.apache.spark.sql.Dataset$$anonfun$dropDuplicates$1.apply(Dataset.scala:1814)
>       at org.apache.spark.sql.Dataset.withTypedPlan(Dataset.scala:2594)
>       at org.apache.spark.sql.Dataset.dropDuplicates(Dataset.scala:1814)
>       at org.apache.spark.sql.Dataset.dropDuplicates(Dataset.scala:1840)
> ...
> {code}



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