Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/10762#discussion_r51175030
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/CheckAnalysis.scala
 ---
    @@ -104,6 +105,9 @@ trait CheckAnalysis {
                   s"filter expression '${f.condition.prettyString}' " +
                     s"of type ${f.condition.dataType.simpleString} is not a 
boolean.")
     
    +          case j @ Join(_, _, NaturalJoin(_), _) =>
    +            failAnalysis(s"natural join not resolved.")
    --- End diff --
    
    if this happens, it must because join operator itself has some problems, 
but not caused by the `NaturalJoin` type. I think we should remove this case 
and let other checking rules to tell users what's wrong.


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