hkulyc commented on code in PR #47425:
URL: https://github.com/apache/spark/pull/47425#discussion_r1731810938


##########
connector/avro/src/main/scala/org/apache/spark/sql/avro/SchemaConverters.scala:
##########
@@ -201,29 +259,33 @@ object SchemaConverters {
                   s,
                   existingRecordNames,
                   useStableIdForUnionType,
-                  stableIdPrefixForUnionType)
-
-                val fieldName = if (useStableIdForUnionType) {
-                  // Avro's field name may be case sensitive, so field names 
for two named type
-                  // could be "a" and "A" and we need to distinguish them. In 
this case, we throw
-                  // an exception.
-                  // Stable id prefix can be empty so the name of the field 
can be just the type.
-                  val tempFieldName = 
s"${stableIdPrefixForUnionType}${s.getName}"
-                  if 
(!fieldNameSet.add(tempFieldName.toLowerCase(Locale.ROOT))) {
-                    throw new IncompatibleSchemaException(
-                      "Cannot generate stable identifier for Avro union type 
due to name " +
-                      s"conflict of type name ${s.getName}")
-                  }
-                  tempFieldName
+                  stableIdPrefixForUnionType,
+                  recursiveFieldMaxDepth)
+                if (schemaType == null) {
+                  null
                 } else {
-                  s"member$i"
-                }
+                  val fieldName = if (useStableIdForUnionType) {

Review Comment:
   Thanks for pointing this out, we currently do not have a test case for this. 
Will add it.



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