wengh commented on code in PR #50408:
URL: https://github.com/apache/spark/pull/50408#discussion_r2033842307


##########
sql/api/src/main/scala/org/apache/spark/sql/types/StructField.scala:
##########
@@ -150,10 +150,13 @@ case class StructField(
   /**
    * Return the default value of this StructField. This is used for storing 
the default value of a
    * function parameter.
+   *
+   * It is present when the column represents a UDF argument type with a 
default
+   * value, such as: CREATE FUNCTION f(arg INT DEFAULT 42) RETURN ....
    */
   private[sql] def getDefault(): Option[String] = {

Review Comment:
   It's only used in a handful places so should be fine to rename in this PR



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