[GitHub] [spark] viirya commented on a change in pull request #25209: [SPARK-28456][SQL]Add a public API `Encoder.copyEncoder` to allow creating Encoder without touching Scala Reflection

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viirya commented on a change in pull request #25209: [SPARK-28456][SQL]Add a public API `Encoder.copyEncoder` to allow creating Encoder without touching Scala Reflection
URL: https://github.com/apache/spark/pull/25209#discussion_r305572944
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/Encoder.scala
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 @@ -80,4 +80,10 @@ trait Encoder[T] extends Serializable {
    * A ClassTag that can be used to construct an Array to contain a collection of `T`.
    */
   def clsTag: ClassTag[T]
+
+  /**
+   * Create a copied [[Encoder]]. The implementation may just copy internal reusable fields to speed
+   * up the [[Encoder]] creation.
+   */
+  def copyEncoder: Encoder[T]
 
 Review comment:
   Seems good `makeCopy`.

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