Github user JoshRosen commented on a diff in the pull request: https://github.com/apache/spark/pull/12750#discussion_r61666404 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala --- @@ -95,7 +95,8 @@ object HiveTypeCoercion { Some(t1) // Promote numeric types to the highest of the two - case (t1, t2) if Seq(t1, t2).forall(numericPrecedence.contains) => --- End diff -- The `Seq` construction, `forall` / traversable code, and `IndexedSeq.contains` calls made this line pretty expensive in the old code.
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