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From cloud-fan <>
Subject [GitHub] spark pull request: [SPARK-12828][SQL]add natural join support
Date Thu, 28 Jan 2016 19:36:58 GMT
Github user cloud-fan commented on a diff in the pull request:
    --- 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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