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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