Github user gatorsmile commented on a diff in the pull request:

    https://github.com/apache/spark/pull/16762#discussion_r98833830
  
    --- Diff: sql/core/src/test/scala/org/apache/spark/sql/JoinSuite.scala ---
    @@ -584,24 +602,37 @@ class JoinSuite extends QueryTest with 
SharedSQLContext {
         val cartesianQueries = Seq(
           /** The following should error out since there is no explicit cross 
join */
           "SELECT * FROM testData inner join testData2",
    -      "SELECT * FROM testData left outer join testData2",
    -      "SELECT * FROM testData right outer join testData2",
    -      "SELECT * FROM testData full outer join testData2",
    --- End diff --
    
    These three queries are examples for outer joins that are unable to be 
replaced by cross join.


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