[jira] [Assigned] (SPARK-14967) EXCEPT does not follow SQL compliance

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-14967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-14967:
------------------------------------

    Assignee:     (was: Apache Spark)

> EXCEPT does not follow SQL compliance
> -------------------------------------
>
>                 Key: SPARK-14967
>                 URL: https://issues.apache.org/jira/browse/SPARK-14967
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Xiao Li
>
> {noformat}
>   test("except") {
>     val df_left = Seq(1, 2, 2, 3, 3, 4).toDF("id")
>     val df_right = Seq(1, 3).toDF("id")
>     checkAnswer(
>       df_left.except(df_right),
>       Row(2) :: Row(2) :: Row(4) :: Nil
>     )
>   }
> {noformat}
> This is the example.
> For `EXCEPT ALL`, we should output
> {noformat}
> Row(2) :: Row(2) :: Row(3) :: Row(4) :: Nil
> {noformat}
> For `EXCEPT DISTINCT`, we should output
> {noformat}
> Row(2) :: Row(4) :: Nil
> {noformat}
> Thus, the current master is wrong. The result it generates is 
> {noformat}
> Row(2) :: Row(2) :: Row(4) :: Nil
> {noformat}



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