shangxinli commented on code in PR #988:
URL: https://github.com/apache/parquet-mr/pull/988#discussion_r950888122


##########
parquet-protobuf/src/main/java/org/apache/parquet/proto/ProtoSchemaConverter.java:
##########
@@ -79,12 +80,20 @@ public MessageType convert(Class<? extends Message> 
protobufClass) {
   }
 
   /* Iterates over list of fields. **/
-  private <T> GroupBuilder<T> convertFields(GroupBuilder<T> groupBuilder, 
List<FieldDescriptor> fieldDescriptors) {
+  private <T> GroupBuilder<T> convertFields(GroupBuilder<T> groupBuilder, 
List<FieldDescriptor> fieldDescriptors, List<String> parentNames) {
     for (FieldDescriptor fieldDescriptor : fieldDescriptors) {
-      groupBuilder =
-          addField(fieldDescriptor, groupBuilder)
+      final String name = fieldDescriptor.getFullName();
+      final List<String> newParentNames = new ArrayList<>(parentNames);
+      newParentNames.add(name);
+      if (parentNames.contains(name)) {
+        // Circular dependency, skip
+        LOG.warn("Breaking circular dependency:{}{}", System.lineSeparator(),

Review Comment:
   I am not very familiar with Proto. By design, is the 'circular' normal in 
the proto or it is caused by issues?  



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