dawidwys commented on code in PR #21635:
URL: https://github.com/apache/flink/pull/21635#discussion_r1081541284


##########
flink-scala/src/main/scala/org/apache/flink/api/scala/typeutils/ScalaEnumSerializerSnapshot.scala:
##########
@@ -80,25 +80,26 @@ class ScalaEnumSerializerSnapshot[E <: Enumeration] extends 
TypeSerializerSnapsh
     new EnumValueSerializer(enumObject)
   }
 
-  override def resolveSchemaCompatibility(
-      newSerializer: TypeSerializer[E#Value]): 
TypeSerializerSchemaCompatibility[E#Value] = {
+  override def resolveSchemaCompatibility(oldSerializerSnapshot: 
TypeSerializerSnapshot[E#Value])
+      : TypeSerializerSchemaCompatibility[E#Value] = {
 
     Preconditions.checkState(enumClass != null)
-    Preconditions.checkState(previousEnumConstants != null)
+    Preconditions.checkState(enumConstants != null)
 
-    if (!newSerializer.isInstanceOf[EnumValueSerializer[E]]) {
+    if (!oldSerializerSnapshot.isInstanceOf[ScalaEnumSerializerSnapshot[E]]) {
       return TypeSerializerSchemaCompatibility.incompatible()
     }
 
-    val newEnumSerializer = newSerializer.asInstanceOf[EnumValueSerializer[E]]
-    if (!enumClass.equals(newEnumSerializer.enum.getClass)) {
+    val oldEnumSerializerSnapshot =
+      oldSerializerSnapshot.asInstanceOf[ScalaEnumSerializerSnapshot[E]]
+    if (!enumClass.equals(oldEnumSerializerSnapshot.enumClass)) {
       return TypeSerializerSchemaCompatibility.incompatible()
     }
 
-    for ((previousEnumName, index) <- previousEnumConstants) {
+    for ((enumName, index) <- oldEnumSerializerSnapshot.enumConstants) {
       try {
-        val newEnumName = newEnumSerializer.enum(index).toString
-        if (previousEnumName != newEnumName) {
+        val oldEnumName = enumConstants(index)._1

Review Comment:
   ```suggestion
           val enumName = enumConstants(index)._1
   ```



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