gianm commented on code in PR #18777:
URL: https://github.com/apache/druid/pull/18777#discussion_r2560835198


##########
processing/src/main/java/org/apache/druid/timeline/partition/PartitionHolder.java:
##########
@@ -41,42 +45,44 @@ public static <T extends Overshadowable<T>> 
PartitionHolder<T> copyWithOnlyVisib
   )
   {
     return new PartitionHolder<>(
-        
OvershadowableManager.copyVisible(partitionHolder.overshadowableManager),
+        partitionHolder.contents.copyVisible(),
         partitionHolder.maxMinorVersion
     );
   }
 
   public static <T extends Overshadowable<T>> PartitionHolder<T> 
deepCopy(PartitionHolder<T> partitionHolder)
   {
     return new PartitionHolder<>(
-        OvershadowableManager.deepCopy(partitionHolder.overshadowableManager),
+        partitionHolder.contents.deepCopy(),
         partitionHolder.maxMinorVersion
     );
   }
 
   public PartitionHolder(PartitionChunk<T> initialChunk)
   {
-    this.overshadowableManager = new OvershadowableManager<>();
     add(initialChunk);
   }
 
   public PartitionHolder(List<PartitionChunk<T>> initialChunks)
   {
-    this.overshadowableManager = new OvershadowableManager<>();
     for (PartitionChunk<T> chunk : initialChunks) {
       add(chunk);
     }
   }
 
-  protected PartitionHolder(OvershadowableManager<T> overshadowableManager, 
short maxMinorVersion)
+  protected PartitionHolder(PartitionHolderContents<T> contents, short 
maxMinorVersion)
   {
-    this.overshadowableManager = overshadowableManager;
+    this.contents = contents;
     this.maxMinorVersion = maxMinorVersion;
   }
 
   public boolean add(PartitionChunk<T> chunk)
   {
-    boolean added = overshadowableManager.addChunk(chunk);
+    if (chunk.getObject().getMinorVersion() != 0 && contents instanceof 
SimplePartitionHolderContents) {
+      // Swap simple map for an OvershadowableManager when minor versions are 
encountered.
+      contents = 
OvershadowableManager.fromSimple((SimplePartitionHolderContents<T>) contents);

Review Comment:
   I think it'll get logged too much, since timelines are created all the time.



##########
processing/src/main/java/org/apache/druid/timeline/partition/OvershadowableManager.java:
##########
@@ -65,7 +65,7 @@
  *
  * This class is not thread-safe.
  */
-class OvershadowableManager<T extends Overshadowable<T>>
+class OvershadowableManager<T extends Overshadowable<T>> implements 
PartitionHolderContents<T>

Review Comment:
   Hmm, rather than rename I added a javadoc.



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