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https://issues.apache.org/jira/browse/SPARK-21647?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16115987#comment-16115987
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Xiao Li commented on SPARK-21647:
---------------------------------

https://github.com/apache/spark/pull/18863

> SortMergeJoin failed when using CROSS
> -------------------------------------
>
>                 Key: SPARK-21647
>                 URL: https://issues.apache.org/jira/browse/SPARK-21647
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Xiao Li
>
> {noformat}
> val df = Seq((1, 1)).toDF("i", "j")
> df.createOrReplaceTempView("T")
> withSQLConf(SQLConf.AUTO_BROADCASTJOIN_THRESHOLD.key -> "-1") {
>   sql("select * from (select a.i from T a cross join T t where t.i = a.i) as 
> t1 " +
>     "cross join T t2 where t2.i = t1.i").explain(true)
> }
> {noformat}
> The above code could cause the following exception:
> {noformat}
> SortMergeJoinExec should not take Cross as the JoinType
> java.lang.IllegalArgumentException: SortMergeJoinExec should not take Cross 
> as the JoinType
>       at 
> org.apache.spark.sql.execution.joins.SortMergeJoinExec.outputOrdering(SortMergeJoinExec.scala:100)
> {noformat}



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