cloud-fan commented on a change in pull request #24085: [SPARK-26555][SQL] make 
ScalaReflection subtype checking thread safe
URL: https://github.com/apache/spark/pull/24085#discussion_r265825702
 
 

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 File path: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala
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 @@ -66,19 +66,25 @@ object ScalaReflection extends ScalaReflection {
    */
   def dataTypeFor[T : TypeTag]: DataType = dataTypeFor(localTypeOf[T])
 
+  private[catalyst] def isSubtype(tpe1: `Type`, tpe2: `Type`): Boolean = {
 
 Review comment:
   can we add some comments to explain it and link to the scala bug report?

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