clintropolis commented on code in PR #13672:
URL: https://github.com/apache/druid/pull/13672#discussion_r1070878997


##########
core/src/main/java/org/apache/druid/java/util/common/parsers/ObjectFlatteners.java:
##########
@@ -218,9 +219,9 @@ public Map<String, Object> toMap(T obj)
   {
     JsonProvider getJsonProvider();
     /**
-     * List all "root" primitive properties and primitive lists (no nested 
objects, no lists of objects)
+     * List all "root" fields, optionally filtering to include only fields 
that contain primitive and lists of primitive values
      */
-    Iterable<String> discoverRootFields(T obj);
+    Iterable<String> discoverRootFields(T obj, boolean discoverNestedFields);

Review Comment:
   yeah, i guess I was thinking doing it this way would force implementors to 
be aware that the contract is a bit different (or at least will be), though 
maybe it is nicer to push into the `FlattenerMaker` constructors instead and we 
just mention in the release notes that implementors should try to honor the 
mode for their readers.



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