rxin commented on a change in pull request #23351: [SPARK-26216][SQL][followup]
use abstract class instead of trait for UserDefinedFunction
URL: https://github.com/apache/spark/pull/23351#discussion_r243066724
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File path:
sql/core/src/main/scala/org/apache/spark/sql/expressions/UserDefinedFunction.scala
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@@ -38,7 +38,7 @@ import org.apache.spark.sql.types.DataType
* @since 1.3.0
*/
@Stable
-sealed trait UserDefinedFunction {
+abstract class UserDefinedFunction {
Review comment:
does scala have the concept of sealed abstract class?
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