Github user sameeragarwal commented on a diff in the pull request: https://github.com/apache/spark/pull/17985#discussion_r116572426 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/joinTypes.scala --- @@ -24,7 +24,7 @@ import org.apache.spark.sql.catalyst.expressions.Attribute object JoinType { def apply(typ: String): JoinType = typ.toLowerCase(Locale.ROOT).replace("_", "") match { case "inner" => Inner - case "outer" | "full" | "fullouter" => FullOuter + case "outer" | "full" | "fullouter" | "full_outer" => FullOuter --- End diff -- as @wzhfy points out, given that we remove underscores, this matching case is unnecessary. The same is true for `left_outer`, `right_outer` and `left_semi`.
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