HyukjinKwon commented on code in PR #46622:
URL: https://github.com/apache/spark/pull/46622#discussion_r1604233127


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sql/api/src/main/scala/org/apache/spark/sql/types/Metadata.scala:
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@@ -49,6 +49,9 @@ sealed class Metadata private[types] (private[types] val map: 
Map[String, Any])
   /** Tests whether this Metadata contains a binding for a key. */
   def contains(key: String): Boolean = map.contains(key)
 
+  /** Tests whether this Metadata is empty. */
+  def isEmpty: Boolean = map.isEmpty

Review Comment:
   Can you add `@since 4.0.0`



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