Github user gatorsmile commented on a diff in the pull request:
    --- Diff: 
    @@ -82,7 +82,7 @@ case class SortMergeJoinExec(
       override def outputOrdering: Seq[SortOrder] = joinType match {
         // For inner join, orders of both sides keys should be kept.
    -    case Inner =>
    +    case _: InnerLike =>
    --- End diff --
    Even worse, this could cause an exception
    val df = Seq((1, 1)).toDF("i", "j")
      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)
    It will return the following error:
    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.ProjectExec
    We need to backport it to 2.2

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